Updated on 2024/10/04

Information

 

写真a

 
HIGASHI YUKIHIRO
 
Organization
International Institute for Carbon-Neutral Energy Research Reseach Center for Next Generation Refrigerant Properties Academic Researcher
Title
Academic Researcher
Contact information
メールアドレス
Tel
0928026728
External link

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Thermal engineering

Degree

  • Doctor of Engineering

Research History

  • Kyushu University I2CNER Research Professor 

    2024.4 - Present

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    Country:Japan

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  • Kyushu University I2CNER Professor 

    2016.6 - 2024.3

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  • Iwaki Meisei University   

Education

  • Keio University   工学部   機械工学

    - 1981

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    Country:Japan

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Research Interests・Research Keywords

  • Research theme: Thermophysical Properties of Fluid

    Keyword: Thermophysical Properties of Fluid

    Research period: 2024

  • Research theme: 流体熱物性

    Keyword: 流体熱物性

    Research period: 2024

  • Research theme: Measurements of Thermodynamic Properties for Next Generation Refrigerants

    Keyword: Next Generation Refrigerants, Low GWP Refrigerants, Thermodynamic Property Measurements, Critical Parameters

    Research period: 1980.4

Awards

  • Best Paper Award 2014/2015

    2015.8   International Journal of Refrigeration, Elsevier  

  • Asian Academic Award

    2013.9   Japan Society of Refrigerating and Air Conditioning Engineers (JSRAE), The Chinese Association of Refrigeration (CAR), The Society of Air-Conditioning and Refrigerating Engineers of Korea (SAREK)  

  • Best Paper Award 2009/2010

    2011.8   International Journal of Refrigeration, Elsevier  

  • Research Achievement Award

    2010.6   Environmental Engineering Division, Japan Society of Mechanical Engineers(JSME)  

  • Kagaku Keisoku Shinkoukai Award

    2000.1   Kagaku Keisoku Shinkoukai  

  • Sadi Carnot Award

    1991.8   International Institute of Refrigeration (IIR)  

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Papers

  • Thermodynamic properties of trifluoroethene (R1123): (p, r, T) behavior and fundamental equation of state Reviewed International journal

    Ryo Akasaka, Yukihiro Higashi, Naoya Sakoda, Sho Fukuda, Eric W. Lemmon

    International Journal of Refrigeration   119   457 - 467   2020.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.ijrefrig.2020.07.011

  • Measurements of PvT Properties, Saturated Densities, and Critical Parameters for 3,3,3-Trifluoropropene (HFO1243zf) Reviewed

    Yukihiro Higashi, Naoya Sakoda

    Journal of Chemical and Engineering Data   63 ( 10 )   3818 - 3822   2018.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    © 2018 American Chemical Society. Measurements of PvT properties, saturated densities, and critical parameters were carried out for a low-GWP refrigerant: 3,3,3-trifluoropropene (HFO1243zf, CF3CH=CH2). Seventy-five PvT property data points along seven isochores around the critical point were obtained in the temperature range from 328 to 430 K, in the density range between 50 and 899 kg m-3, and at pressures up to 6.9 MPa by the isochoric method. Fourteen saturated densities were obtained by the observation of meniscus disappearance in the critical region. On the basis of these measurements, the critical parameters of Tc = 376.93 ± 0.01 K and ρc = 414 ± 3 kg m-3 were determined. The present results are compared to an available equation of state.

    DOI: 10.1021/acs.jced.8b00452

  • Measurements of Saturation Pressures for Trifluoroethene (R1123) and 3,3,3-Trifluoropropene (R1243zf) Reviewed

    Yukihiro Higashi, Naoya Sakoda, Md Amirul Islam, Yasuyuki Takata, Shigeru Koyama, Ryo Akasaka

    Journal of Chemical and Engineering Data   63 ( 2 )   417 - 421   2018.2

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    © 2018 American Chemical Society. Saturation pressures for new low global warming potential refrigerants trifluoroethene (R1123, CF2= CHF) and 3,3,3-trifluoropropene (R1243zf, CF3CH=CH2) were measured by the isochoric method for temperatures between 278 and 377 K. Temperature was measured with a 25 standard platinum resistance thermometer on ITS-90. Pressure was measured with a digital quartz pressure transducer. The experimental uncertainties in temperature and pressure are estimated to be 5 mK and 1 kPa (k = 2), respectively. New saturation-pressure correlations for the refrigerants have been formulated based on the present saturation-pressure data. The critical pressures of R1123 and R1243zf were also determined.

    DOI: 10.1021/acs.jced.7b00818

  • Gaseous PVT Property Measurements of cis-1,3,3,3-Tetrafluoropropene Reviewed

    Naoya Sakoda, Jiang Shiheng, Masamichi Kohno, Shigeru Koyama, Yukihiro Higashi, Yasuyuki Takata

    Journal of Chemical and Engineering Data   62 ( 7 )   2178 - 2182   2017.7

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    © 2017 American Chemical Society. PVT properties in the vapor phase of cis-1,3,3,3-tetrafluoropropene (R1234ze(Z)) were measured by a multiple expansion method in the temperature range from 353 to 413 K and at pressures up to 2.7 MPa. Thirty data along four isotherms are obtained in the temperatures between 353 and 413 K. The vapor pressures at the temperatures were also measured by adding a sample of R1234ze(Z) to a sample cell at the vapor-liquid equilibrium conditions. The uncertainties in temperature and pressure measurements are estimated to be within 6 mK and 0.3 kPa, respectively. The expanded uncertainty in density measurement is estimated within no greater than 0.12% (k = 2). The obtained PVT properties and vapor pressures are compared with the existing equation of state.

    DOI: 10.1021/acs.jced.7b00263

  • Measurements of PρT properties, vapor pressures, saturated densities, and critical parameters for R 1234ze(Z) and R 245fa Reviewed

    Yukihiro Higashi, Shugo Hayasaka, Chihiro Shirai, Ryo Akasaka

    International Journal of Refrigeration   52   100 - 108   2015.5

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    Measurements of PρT properties, vapor pressures, saturated densities, and critical parameters for R 1234ze(Z) and R 245fa
    © 2014 Elsevier Ltd and IIR. All rights reserved. Abstract Pressure-density-temperature (PρT) properties, vapor pressures, and saturated liquid and vapor densities for refrigerants R 1234ze(Z) (cis-1,3,3,3-tetrafluoroprop-1-ene; CF3CHCHF) and R 245fa (1,1,1,3,3-pentafluoropropane; C3H3F5) were measured with two types of isochoric methods. Pressure was measured with a digital quartz pressure transducer. Temperature was measured with 25 Ω standard platinum resistance thermometer on the ITS-90 temperature scale. Density was calculated from the mass of sample and the inner volume of pressure vessel. By using the present vapor pressure data, new vapor pressure correlations for R 1234ze(Z) and R 245fa have been formulated. In addition, the critical temperature Tc, critical density ρc, and critical pressure Pc were directly determined on the basis of direct observation of the meniscus disappearance.

    DOI: 10.1016/j.ijrefrig.2014.12.007

  • Thermodynamic properties of HFO-1234yf (2,3,3,3-tetrafluoropropene) Reviewed

    Katsuyuki Tanaka, Yukihiro Higashi

    International Journal of Refrigeration   33 ( 3 )   474 - 479   2010.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    Measurements of the thermodynamic properties of HFO-1234yf were conducted. The critical temperature TC, critical density ρC, and critical pressure PC, were measured by the visual observation of the meniscus disappearance, and were determined to be 367.85 ± 0.01 K, 478 ± 3 kg/m3, and 3382 ± 3 kPa, respectively. Vapor pressures were measured by a batch-type calorimeter with a metal-bellows in the temperature range from 310 K to 360 K and correlated by the Wagner-type equation. Surface tensions were measured by the differential capillary-rise method in the temperature range from 273 K to 340 K and correlated by the van der-Waals type equation. The acentric factor was determined to be 0.280 with the vapor pressure correlation. Based on the critical parameters and acentric factor, saturated vapor and liquid densities were estimated by the Peng-Robinson equation and the Hankinson-Thomson equation, respectively. The heat of vaporization was also calculated from the Clausius-Clapeyron equation. © 2009 Elsevier Ltd and IIR.

    DOI: 10.1016/j.ijrefrig.2009.10.003

  • Surface tension measurement and molecular simulation for new low global warming potential refrigerants R1132(E) and R1132a

    Imai, T; Kawahara, T; Nonaka, R; Tomassetti, S; Okumura, T; Higashi, Y; Di Nicola, G; Kondou, C

    JOURNAL OF MOLECULAR LIQUIDS   407   2024.8   ISSN:0167-7322 eISSN:1873-3166

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    Publisher:Journal of Molecular Liquids  

    This study performed surface tension measurements assisted by molecular simulations for new candidate refrigerants R1132(E) and its isomer R1132a, which exhibit extremely low global warming potentials. Because the measured saturation density required for the surface tension measurement by the differential capillary rise method is insufficient at low temperatures, the density data was extrapolated by molecular simulations. In the process, quantum chemical and molecular dynamics simulations were performed to reproduce the vapor–liquid equilibrium state, and the accuracy of the obtained molecular force fields was verified by comparing them with the measured data. Based on the obtained surface tension data, validated temperature correlation equations were proposed for R1132(E) and R1132a, respectively, validated in the temperature range from 209 K to 225 K. Furthermore, their parachors, which relate surface tension to saturation density, were determined from the above data as 116.1 and 116.7 for R1132(E) and R1132a, respectively.

    DOI: 10.1016/j.molliq.2024.125262

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  • Thermodynamic Property Measurements of Binary Refrigerant Blends HFO1123+R290

    Sakoda, N; Ishimaru, H; Higashi, Y

    INTERNATIONAL JOURNAL OF THERMOPHYSICS   45 ( 5 )   2024.5   ISSN:0195-928X eISSN:1572-9567

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    Publisher:International Journal of Thermophysics  

    PVTx properties of 0.80 mass fraction HFO1123 + 0.20 mass fraction R290 and 0.65 mass fraction HFO1123 + 0.35 mass fraction R290 refrigerant blends were measured in the temperature range from 300 K to 400 K and at pressures up to 6.9 MPa by the isochoric method along 6 isochores for each blend including the vapor and liquid phases. The expanded uncertainties in temperature and pressure are estimated to be 5 mK and 1.0 kPa (k = 2). The relative expanded uncertainties in density and mass fraction are estimated to be 0.15% and 0.0005 (k = 2), respectively. Saturated densities of these blends were directly measured in the temperature range between 319 K and 342 K by the visual observation of the meniscus disappearance, and also determined from the inflection points of the PVTx isochore-lines. Finally, the critical points of the blends were determined by the consideration of the meniscus disappearing level as well as the intensity of the critical opalescence as Tc = 334.91 ± 0.01 K, ρc = 402 ± 3 kg·m−3 and Pc = 4392 ± 3 kPa for 0.80 mass fraction HFO1123 + 0.20 mass fraction R290, and Tc = 340.94 ± 0.02 K, ρc = 357 ± 3 kg·m−3 and Pc = 4429 ± 5 kPa for 0.65 mass fraction HFO1123 + 0.35 mass fraction R290. A Helmholtz energy equation of state (EOS) was compared with the experimental data, and is in good agreement with the obtained PVTx property data with an absolute average deviation (AAD) of 1.1% for 0.80 mass fraction HFO1123 + 0.20 mass fraction R290, and that of 0.7% for 0.65 mass fraction HFO1123 + 0.35 mass fraction R290 in density. In addition, vapor-liquid equilibrium data of HFO1123 + R290 blends were obtained from 263 K to 323 K based on the recirculation method. A mixing parameter of a simple cubic EOS was determined, and the EOS represents the VLE data with an AAD of 0.73% in pressure and 0.010 mol·mol−1 in mole fraction.

    DOI: 10.1007/s10765-024-03330-6

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  • Energy, exergy and environmental (3E) analysis of low GWP refrigerants in cascade refrigeration system for low temperature applications

    Sannan Salabat Butt, Uthpala A. Perera, Takahiko Miyazaki, Kyaw Thu, Yukihiro Higashi

    International Journal of Refrigeration   160   373 - 389   2024.4   ISSN:0140-7007 eISSN:1879-2081

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    This study presents a comparative energy, exergy, and life cycle climate performance (LCCP) analysis of various refrigerants in a cascade refrigeration system (CRS). The refrigerants analyzed in the low-temperature cycle (LTC) include R-23, R-116, R-41, R-170, R-1150, and R-1132a whereas high-temperature cycle (HTC) utilizes R-404A, R-455A, R-454C, R-459B, R-161, R-290, R-1270, and R-1234yf. For the first time for CRS, LCCP analysis is conducted and fourth generation low GWP and less flammable prospective refrigerants R-1132a, R-455A, R-454C, R-459B are analyzed. The study aims to find a refrigerant pair that outperforms R-23/R-404A in terms of thermodynamic efficiency while also considering environmental impact and safety considerations. Among the 48 refrigerant groups analyzed, the study reveals that R-170/R-161 and R-41/R-161 demonstrate superior performance in terms of thermodynamic efficiency and environmental impact assessment whereas the largest exergy destruction components are HTC/LTC compressors. However, if flammability is a major concern, the recommended refrigerant pair is R-1132a/R-1234yf, as it is a suitable alternative in terms of safety considerations while still maintaining favorable thermodynamic and environmental performance.

    DOI: 10.1016/j.ijrefrig.2023.12.020

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  • Vapor-Liquid Equilibrium and <i>PVTx</i> Property Measurements of HFO1123+CF<sub>3</sub>I and HFC125+CF<sub>3</sub>I

    Sakoda, N; Kitabatake, K; Ishimaru, H; Higashi, Y

    INTERNATIONAL JOURNAL OF THERMOPHYSICS   45 ( 1 )   2024.1   ISSN:0195-928X eISSN:1572-9567

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    Publisher:International Journal of Thermophysics  

    Vapor–liquid equilibrium (VLE) of binary refrigerant blends, HFO1123 + CF3I and HFC125 + CF3I, were measured at temperature range from 263 to 323 K by the recirculation method. A sample was filled into an equilibrium cell of the experimental apparatus equipped with optical windows in the vapor–liquid equilibrium condition, and the saturated vapor and liquid were extracted from each phase in small quantities. The compositions of the samples were measured by a gas chromatograph with a thermal conductivity detector and a Porapak-Q column. The expanded uncertainties in temperature, pressure, and composition are estimated to be 10 mK, 3.0 kPa, and 0.007 mol·mol−1, respectively. Based on the experimental data, mixing parameters of a cubic equation of state (PR EOS) and Helmholtz energy EOSs were determined. The VLE behavior (temperature, pressure, and composition relation) calculated from the PR EOS and the Helmholtz energy EOSs show good agreement with each other. The PR EOS reasonably represents the VLE data with an absolute average deviation (AAD) of 1.8% for HFO1123 + CF3I and that of 1.1% for HFC125 + CF3I in pressure, and with an AAD of 0.012 mol·mol−1 in mole fraction for both mixtures. In addition, PVTx properties of HFO1123 + CF3I and HFC125 + CF3I blends were measured from 300 to 400 K and at pressures up to 6.9 MPa by the isochoric method. The expanded uncertainties in temperature and pressure are estimated to be 5 mK and 1.0 kPa (k = 2). The relative expanded uncertainties in density and mass fraction are estimated to be 0.0015 and 0.0005 (k = 2), respectively. The Helmholtz energy EOSs with the mixing parameters determined on the basis of the VLE data were compared with the experimental PVTx property data, and the EOSs represent them in the vapor phase except for the isochores near the critical density with an AAD of 0.9% in density.

    DOI: 10.1007/s10765-023-03286-z

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  • PvT Properties and Thermodynamic Property Correlations for the Low Global Warming Potential Hydrofluoroolefin Refrigerant R-1132a (1,1-Difluoroethene)

    Uthpala Perera, Kozue Miyane, Naoya Sakoda, Kyaw Thu, Yukihiro Higashi

    International Journal of Thermophysics   44 ( 6 )   84   2023.6   ISSN:0195-928X eISSN:1572-9567

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:International Journal of Thermophysics  

    R-1132a is increasingly being considered as a low global warming potential component in alternative mixtures to R-23 in specialized low temperature and ultra-low temperature refrigeration systems. Though the thermodynamic properties of R-1132a were investigated in several studies up to 2018, reinvestigations have been carried out in recent years. In order to contribute toward these renewed measurements, the critical parameters of R-1132a were experimentally re-determined. Thirty-two vapor pressures from 240 K to the critical temperature, fifteen saturated vapor and six saturated liquid densities above 254 K and the PvT properties in both the vapor phase (98 points) and liquid phase (34 points) from densities of 50 kg·m−3 to 760 kg·m−3 were also measured. Specific correlations for each of these properties were optimized and compared to previously available data from the literature. Additionally, the Peng–Robinson equation of state was used to represent the aforementioned properties and further utilized to determine the enthalpy and entropy of R-1132a.

    DOI: 10.1007/s10765-023-03184-4

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  • Vapour Pressure Measurements and Correlations for 1,1-Difluoroethene (R-1132a) at 240–296 K using a Newly Developed Isochoric Apparatus

    Kyaw Thu, Uthpala A. Perera, Kozue Miyane, Naoya Sakoda, Yukihiro Higashi

    International Journal of Thermophysics   44 ( 4 )   2023.4   ISSN:0195-928X eISSN:1572-9567

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    Publishing type:Research paper (scientific journal)   Publisher:International Journal of Thermophysics  

    A new isochoric apparatus was developed for measuring PvT properties of refrigerants from 240 K to 410 K. This temperature range extends measurements below ambient (~ 300 K) and overlaps with the range of other isochoric apparatuses in NEXT-RP centre of I2CNER, Kyushu University. PvT properties of four refrigerants (1,1,1,2-tetrafluoroethane, R-134a; pentafluoroethane, R-125; trifluoromethane, R-23 and 2,3,3,3-tetrafluoropropene, R-1234yf) were measured for the inner volume calculation and validation exercise. Vapour pressures of 1,1-difluoroethene (R-1132a) were measured between 240 K and 296 K (14 data points). All property measurements were conducted for heating up and cooling down phases. The expanded uncertainty values of temperature, pressure and density using the new isochoric apparatus are U(T) = 10 mK, U(p) = 1 kPa and Ur(ρ) = 0.002, respectively, where the coverage of 2 was adopted for 95% confident levels. The measured vapour pressures were fitted using Wagner-type and Antoine-type equations and compared with the published data.

    DOI: 10.1007/s10765-023-03167-5

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  • <i>pvT</i> Properties of the Refrigerant Blend R 473A in the Vapor Phase

    PERERA Uthpala, THU Kyaw, SAKODA Naoya, HIGASHI Yukihiro

    Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers   39 ( 4 )   303   2022.12   ISSN:13444905 eISSN:2185789X

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    Language:English   Publisher:Japan Society of Refrigerating and Air Conditioning Engineers  

    <p><b> </b>R 473A is an emerging four-component refrigerant blend for replacing high GWP and flammable refrigerants currently used for low temperature applications. Since limited prior publications on the thermodynamic properties of R 473A are available, the initial investigation of its vapor phase <i>pvT</i> properties were carried out and are presented here. The <i>pvT</i> properties were measured using two separate isochoric apparatus for the temperature range of 270 K to 400 K, density range of 43 kg·m<sup>-3</sup> to 210 kg·m<sup>-3 </sup>and at pressures below 7 MPa. The virial equation of state was used to verify the measured properties. The linearized virial equation was used to determine the second and third virial coefficients. This method provided an absolute average deviation in pressure and density of 0.29% and 0.38%, respectively. The measured properties were all within 1% deviations which signify the accuracy of the results and the potential for them to be used as preliminary data for developing a more accurate representation of R 473A properties through equations of state.</p>

    DOI: 10.11322/tjsrae.22-24dt_em

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  • Vapor-Phase (<i>p</i>, ρ, <i>T</i>) Behavior of Difluoromethane (R32) + Trifluoroiodomethane (R13I1), Pentafluoroethane (R125) + R13I1, and R32 + R125 + R13I1 Mixtures: Experimental Measurements Based on the Isochoric Method and Verification with a Generalized Virial Equation of State Reviewed

    Ryo Akasaka, Yohei Kayukawa, Yukihiro Higashi

    International Journal of Thermophysics   43 ( 10 )   159   2022.10   ISSN:0195-928X eISSN:1572-9567

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Mixing R13I1 with flammable or weakly flammable refrigerants is an approach to reduce both their flammability and global warming potential (GWP); however, thermodynamic property data of mixtures containing R13I1 are currently scarce. In this work, experimental measurements were performed for the (p, ρ, T) behavior in the vapor-phase of R32 + R13I1, R125 + R13I1, and R32 + R125 + R13I1 mixtures. The measurements were made at temperatures from 300 K to 400 K and pressures up to 6.3 MPa, and 44 data points were obtained for the R32 + R13I1 mixture and 25 data points for the R125 + R13I1 mixture. For the ternary mixture, 25 data points were obtained at the composition of R466A (R32:R125:R13I1 = 49:11.5:39.5 mass %). The validity of the experimental data was verified by comparing to the virial equation of state generalized for nonpolar or weakly polar fluids based on the corresponding states principle. The comparison showed that deviations between the experimental and calculated pressures are generally minor and less scattered; this suggests that the (p, ρ, T) data obtained in this work are reasonable in terms of the law of corresponding states.

    DOI: 10.1007/s10765-022-03080-3

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    Other Link: https://link.springer.com/article/10.1007/s10765-022-03080-3/fulltext.html

  • Measurements of PvT properties, saturated densities, and critical parameters of R1132(E)

    Naoya Sakoda, Uthpala A Perera, Kyaw Thu, Yukihiro Higashi

    International Journal of Refrigeration   140   166 - 171   2022.8   ISSN:0140-7007 eISSN:1879-2081

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    PvT properties, saturated densities, and critical parameters of R1132(E) were measured with two kinds of experimental apparatus. Along eight isochores between 65 and 832 kg m−3, PvT property measurements were carried out in the temperature range from 310 to 400 K and at pressures up to 6.5 MPa by the isochoric method. The saturated-vapor and saturated-liquid densities were determined by the visual observation of meniscus disappearance and by the break point of the PvT property isochores in the temperature range from 304 K to the critical temperature and in the density range from 65 to 833 kg m−3. The critical temperature and density were also determined as Tc = 348.82 ± 0.01 K and ρc = 438 ± 3 kg m−3 on the basis of the meniscus disappearing level as well as the intensity of the critical opalescence.

    DOI: 10.1016/j.ijrefrig.2022.05.012

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  • PvT Properties, Saturation Pressures, Saturated Densities, and Critical Parameters of Trifluoroiodomethane (CF3I; R-13I1)

    Uthpala A. Perera, Kyaw Thu, Naoya Sakoda, Miyane Kozue, Yukihiro Higashi

    Journal of Chemical & Engineering Data   67 ( 9 )   2182 - 2192   2022.6   ISSN:0021-9568 eISSN:1520-5134

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    Measurements of PvT properties, saturated pressures, saturated densities, and critical parameters were carried out for R-13I1 (trifluoroiodomethane; CF3I). Forty-seven PvT property data in the one-phase region along seven isochores for R-13I1 were obtained in the temperatures between 310 and 405 K, pressures up to 6392 kPa, and densities between 48 and 1784 kg·m-3using the isochoric method. Thirty-seven saturation pressure data for R-13I1 were obtained in the temperatures between 240 K and the critical temperature and pressures between 58 kPa and the critical pressure. Twenty-six saturated density data for R-13I1 were obtained by the observation of meniscus disappearance and the inflection points of the isochore in the densities between 48 and 1784 kg·m-3. On the basis of these measurements, the critical temperature, critical density (critical molar volume), and critical pressure of R-13I1 were determined as Tc= 396.495 ± 0.010 K (with a coverage factor, k = 2), ρc= 865 ± 5 kg·m-3(vc= 226.5 ± 1.3 cm3·mol-1) (bracketed interval), and Pc= 3971 ± 3 kPa (with a coverage factor, k = 2), respectively. Moreover, a correlation for the saturation pressure and correlations for the vapor liquid coexistence curve were established by optimization techniques.

    DOI: 10.1021/acs.jced.2c00182

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  • Corrigendum to ‘‘Measurement of the vapor-liquid equilibrium properties of the binary low GWP refrigerant R32/R1123'' [International Journal of Refrigeration 119C (2020) 340–348](S0140700720303078)(10.1016/j.ijrefrig.2020.07.005)

    H. Miyamoto, T. Saito, N. Sakoda, U. Perera, T. Ishii, K. Thu, Y. Higashi

    International Journal of Refrigeration   136   219 - 219   2022.4   ISSN:0140-7007 eISSN:1879-2081

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    Publishing type:Research paper (scientific journal)   Publisher:International Journal of Refrigeration  

    The authors regret the typo error of one data at T=320.11 K in Table 3. The corrected table is as follow; No other error is found. All figures and equations in this article were made based on the correct data set. The authors would like to apologise for any inconvenience caused.

    DOI: 10.1016/j.ijrefrig.2021.01.027

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  • Measurements of saturation pressures for the novel refrigerant R1132(E)<sup>✰</sup>

    Uthpala A. Perera, Naoya Sakoda, Takahiko Miyazaki, Kyaw Thu, Yukihiro Higashi

    International Journal of Refrigeration   135   148 - 153   2022.3   ISSN:0140-7007

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    Publishing type:Research paper (scientific journal)   Publisher:International Journal of Refrigeration  

    R1132(E) (trans-1,2-difluoroethylene, C2H2F2) is a potential next generation refrigerant to be utilized in air conditioning applications. This hydrofluoroolefin (HFO) refrigerant possesses an extremely low-GWP value below 1 and it is an excellent candidate for replacing R32 in blends such as R410A, which are subjected to local and international greenhouse gas regulations for limiting global warming. Two isochoric apparatus were used to measure the saturation pressures of R1132(E) from 240 K to its critical temperature. At the critical temperature, the critical pressure of R1132(E) was also directly measured. Twenty-four saturation pressures including the critical point were used for optimizing a Wagner-type equation representing the saturation pressure curve. The absolute average deviation of the saturation pressures of R1132(E) predicted by the model using the fitted parameters and the experimental data is 0.02%. The optimized Wagner-type equation of saturation pressures is used for determining the acentric factor of R1132(E) as 0.2433, which is further utilized for the prediction of the saturation pressures using the Peng-Robinson cubic equation of state within an absolute average deviation of 0.31%.

    DOI: 10.1016/j.ijrefrig.2021.12.014

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  • Thermodynamic Properties of 2,3,3,3-Tetrafluoroprop-1-ene (R1234yf) and Propane (R290) Mixtures: (p, ρ, T) Behavior, Saturated Liquid and Vapor Densities, Critical Parameters, and a Mixture Model

    Ryo Akasaka, Sho Fukuda, Kozue Miyane, Yukihiro Higashi

    Journal of Chemical & Engineering Data   67 ( 2 )   346 - 357   2022.2   ISSN:0021-9568 eISSN:1520-5134

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    Publishing type:Research paper (scientific journal)   Publisher:Journal of Chemical and Engineering Data  

    The (p, ρ, T) behavior of a refrigerant mixture of 50.00 mass% R1234yf and 50.00 mass% R290 was measured with the isochoric method. Along the six isochores (60, 121, 305, 500, 550, and 600 kg·m-3), a total of 40 single-phase (p, ρ, T) data points were obtained at temperatures from 330 to 400 K and pressures up to 6.6 MPa. In addition, the phase boundary of this mixture was experimentally investigated by visual observation of the vapor-liquid meniscus, and a total of 17 saturated densities and the critical parameters were obtained. Additionally, five saturated densities were also determined from the inflection points of the isochores. According to the multifluid approximation approach, a thermodynamic mixture model was formulated for R1234yf/290 mixtures. The parameters of the mixture model were determined by fitting the experimental data obtained in this work and those available in the literature. Expected uncertainties (k = 2) in calculated values with the mixture model are 0.2% for bubble and dew point pressures, 0.2% for liquid densities, 0.4% for vapor densities, 1% for saturated liquid and vapor densities, and 1.5% for isochoric heat capacities in the liquid phase. The mixture model can also be applied to regions away from the fitted experimental data with reasonable accuracy because it extrapolates well to higher temperatures and pressures, and to lower temperatures.

    DOI: 10.1021/acs.jced.1c00890

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  • Achieving a Carbon Neutral Future through Advanced Functional Materials and Technologies

    Andrew Chapman, Elif Ertekin, Masanobu Kubota, Akihide Nagao, Kaila Bertsch, Arnaud Macadre, Toshihiro Tsuchiyama, Takuro Masamura, Setsuo Takaki, Ryosuke Komoda, Mohsen Dadfarnia, Brian Somerday, Alexander Tsekov Staykov, Joichi Sugimura, Yoshinori Sawae, Takehiro Morita, Hiroyoshi Tanaka, Kazuyuki Yagi, Vlad Niste, Prabakaran Saravanan, Shugo Onitsuka, Ki-Seok Yoon, Seiji Ogo, Toshinori Matsushima, Ganbaatar Tumen-Ulzii, Dino Klotz, Dinh Hoa Nguyen, George Harrington, Chihaya Adachi, Hiroshige Matsumoto, Leonard Kwati, Yukina Takahashi, Nuttavut Kosem, Tatsumi Ishihara, Miho Yamauchi, Bidyut Baran Saha, Md. Amirul Islam, Jin Miyawaki, Harish Sivasankaran, Masamichi Kohno, Shigenori Fujikawa, Roman Selyanchyn, Takeshi Tsuji, Yukihiro Higashi, Reiner Kirchheim, Petros Sofronis

    Bulletin of the Chemical Society of Japan   95 ( 1 )   73 - 103   2022.1   ISSN:0009-2673 eISSN:1348-0634

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    Current greenhouse gas emissions suggest that keeping global temperature increase below 1.5 degrees, as espoused in the Paris Agreements will be challenging, and to do so, the achievement of carbon neutrality is of utmost importance. It is also clear that no single solution can meet the carbon neutral challenge, so it is essential for scientific research to cover a broad range of technologies and initiatives which will enable the realization of a carbon free energy system. This study details the broad, yet targeted research themes being pioneered within the International Institute for Carbon-Neutral Energy Research (I2CNER). These approaches include hydrogen materials, bio-mimetic catalysts, electrochemistry, thermal energy and absorption, carbon capture, storage and management and refrigerants. Here we outline the state of the art for this suite of technologies and detail how their deployment, alongside prudent energy policy implementation can engender a carbon neutral Japan by 2050. Recognizing that just as no single technological solution will engender carbon neutrality, no single nation can expect to achieve this goal alone. This study represents a recognition of conducive international policy agendas and is representative of interdisciplinary, international collaboration.

    DOI: 10.1246/bcsj.20210323

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  • Saturation pressure measurements of the new refrigerant HFO1132(E) Reviewed International journal

    Uthpara Perera, Kyaw Thu, Takahiko Miyazaki, Naoya Sakoda, Yukihiro Higashi

    Proceedings of 2nd Conference on HFOs and Low GWP blends   12 - 19   2021.6

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    DOI: 10.18462/iir.HFO.2021.1023

  • Heat Pump Cycle Using Refrigerant Mixtures of HFC32 and HFO1234yf Reviewed International journal

    Kosei Takezato, Shou Senba, Takahiko Miyazaki, Nobuo Takata, Yukihiro Higashi, Kyaw Thu

    Heat Transfer Engineering   42 ( 13 )   1097 - 1106   2021.6

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    Countermeasures for global warming have been promoted internationally. Heat pump cycles that utilize refrigerants with high global warming potential values are required to adopt the next generation refrigerants to conform to the revised Montreal Protocol. Refrigerants R410A is commonly used in the room air conditioners while it has been substituted with HFC32 in Japan; yet their global warming potential values are relatively high and are going to be phased down in the near future. On the other hand, refrigerant mixtures such as the blend of HFC32 and HFO1234yf with extremely low global warming potential can be considered as possible alternatives in compromising the flammability and the ecological tribulations. Targeting the global warming potential value of 150 or lower, the performance of HFC32/HFO1234yf (22/78 mass%) blend was evaluated using drop-in tests, and the results were compared with those of R410A and HFC32. Optimum charge amounts for these refrigerants were first evaluated, followed by the performance comparison in terms of the coefficient of performance from part- to full-load operations. The results showed that the current blend with the low global warming potential less than 150 is comparable to the targeted substitutes at part-load operations while within 83–87% of the COP using HFC32 was achievable at the full-load. The performance results from these experiments could serve as the basis for the refrigerant evaluation targeting the global warming potential 150.

    DOI: 10.1080/01457632.2020.1776997

  • Exergy Investigation of R410A as a ‘Drop In’ Refrigerant in a Water-Cooled Mechanical Vapor Compression Cycle Reviewed International journal

    Colombatantirige Uthpala Amoda Perera, Nobuo Takata, Takahiko Miyazaki, Yukihiro Higashi, Bidyut Baran Saha, Kyaw Thu

    Heat Transfer Engineering   42 ( 13 )   1069 - 1086   2021.6

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    The urge to replace hydrofluorocarbons which possess high global warming potentials has taken center stage in the air conditioning industry due to both international and local policies such as the Kigali Amendment and Japan’s revised Fluorinated Gas law. This has prompted the exploration of novel refrigerants as well as their mixtures to create high performance environmentally friendly alternatives. These refrigerants can be integrated into existing systems as ‘drop in’ refrigerants, which provide a simpler and low cost substitution process to replace environmentally harmful refrigerants such as R410a. R410a is currently a widely used refrigerant in air conditioning systems, but is to be phased out of use under the Kigali Amendment by the late 2040s. Thus to compare the suitability of replacing this refrigerant with environmentally friendly ‘drop in’ alternatives, a preliminary baseline investigation on a mechanical vapor compression chiller with R410a is conducted via performance and exergy indicators. The testing procedure utilized Air Conditioning, Heating and Refrigeration Standard 551/591 which revealed an optimum charge amount of 0.70 kg with a peak performance near 88% of full capacity. The heat exchanger overall heat transfer coefficients showed varying trends, whilst the exergy destruction was as expected highest for the compressor.

    DOI: 10.1080/01457632.2020.1776990

  • Thermodynamic properties measurements of HFO1132(E) Reviewed International journal

    Naoya Sakoda, Yukihiro Higashi

    Proceedings of 2nd IIR Conference on HFOs and Low GWP Blends   2021.6

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    DOI: 10.18462/iir.HFO.2021.1024

  • Measurements of PvT Properties, Vapor Pressures, Saturated Densities, and Critical Parameters for trans-1,1,1,4,4,4-Hexafluoro-2-nutene (R1336mzz(E)) Reviewed International journal

    Naoya Sakoda, Yukihiro Higashi, Ryo Akasaka

    Journal of Chemical Engineering Data   66   734 - 739   2021.3

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    DOI: 10.1021/acs.jced.0c00848

  • Drop-in experiments and energy assessment of HFC-32/HFO-1234yf/R744 mixture with GWP below 150 for domestic heat pumps Reviewed International journal

    Kyaw Thu, Kosei Takezato, Nobuo Takata Takahiko Miyazaki, Yukihiro Higashi

    International Journal of Refrigeration   121   289 - 301   2021.1

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    DOI: 10/1016/j.ijrefrig.2020.10.009

  • Performance evaluation of a heat pump system using an HFC32/HFO1234yf blend with GWP below 150 for heating applications Invited Reviewed International journal

    Kyaw Thu, Kosei Takezato, Nobuo Takata, Takahiko Miyazaki, Yukihiro Higashi

    Applied Thermal Engineering   182   2021.1

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    DOI: 10.1016/j.applthermaleng.2020.115952

  • Measurement of the vapor–liquid equilibrium properties of the binary low GWP refrigerant R32/R1123 Reviewed

    H. Miyamoto, T. Saito, N. Sakoda, U. Perera, T. Ishii, K. Thu, Y. Higashi

    International Journal of Refrigeration   119   340 - 348   2020.11

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    © 2020 The vapor–liquid equilibrium properties of R32/R1123 binary refrigerant mixtures were precisely determined. Such mixtures have the potential to provide a reduced global warming potential although data regarding their properties is extremely limited, especially with regard to vapor–liquid equilibrium characteristics such as boiling point and dew point pressures, for which no actual experimental data exist. The present study acquired such data by means of two recirculation type apparatuses located at different universities. One apparatus, which was used to measure data in high temperature region, is installed at Toyama Prefectural University and includes an optical cell and two circulation loops with a thermostatted liquid bath. After thermal equilibration, a part of the sample in both loops is sandwiched between two valves and mixed with helium, following which the compositions are determined using gas chromatograpy. The other apparatus, which was for lower temperature region, at Kyushu University, has a similar design. The vapor–liquid equilibrium data were obtained between 300 and 330 K using the apparatus for high temperatures and from 273 to 313 K using the apparatus for low temperatures. These data were compared with predictions from the Helmholtz-type equation of state and a systematic deviation of approximately 1&#37; was observed at low temperatures. A regression analysis using the binary interaction parameter kij for the modified Peng–Robinson equation of state more accurately reproduced the present measurement results.

    DOI: 10.1016/j.ijrefrig.2020.07.005

  • Vapor-Liquid Equilibrium Property Measurements for R32/R1234yf Binary Mixtures in Low R32 Concentration Reviewed International journal

    T. Yamada, H. Miyamoto, N. Sakoda, Y. Higashi

    International Journal of Thermophysics   41 ( 167 )   1 - 12   2020.10

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    DOI: 10.1007/s10765-020-02752-2

  • 地球温暖化係数の低い新冷媒の熱物性測定と状態方程式の開発 Invited Reviewed

    東之弘

    化学工学   84 ( 7 )   338 - 341   2020.7

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  • Measurements of Vapor Pressures for trans-1-Chloro-3,3,3-trifluoropropene (R1233zd(E)) and cis-1,1,1,4,4,4-Hexafluoro-2-butene (R1336mzz(Z)) Reviewed International journal

    Naoya Sakoda, Yukihiro Higashi, Ryo Akasaka

    Journal of Chemical and Engineering Data   65   4285 - 4289   2020.7

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    Vapor pressures for new low-GWP refrigerants of R1233zd(E) (trans-1-chloro-3,3,3-trifluoropropene) and R1336mzz(Z) (cis-1,1,1,4,4,4-hexafluoro-2-butene) were measured by the isochoric method. Twelve vapor-pressure measurements of R1233zd(E) were obtained at temperatures between 300 and 410 K, whereas 17 vapor-pressure measurements of R1336mzz(Z) were obtained at temperatures between 290 and 410 K. Temperature was measured with a 25 ω standard platinum resistance thermometer with an aid of ITS-90, and pressure was measured with a digital quartz pressure transducer. The experimental uncertainties in temperature and pressure are estimated to be within 5 mK and 1 kPa, respectively. The experimental data were compared with the previous experimental data and equations of state. New vapor-pressure correlations of R1233zd(E) and R1336mzz(Z) have been formulated on the basis of the data obtained.

    DOI: 10.1021/acs.jced.0c00239

  • Two-Phase and Vapor-Phase Thermophysical Property (pvTz) Measurements of the Difluoromethane + trans-1,3,3,3-Tetrafluoroprop-1-ene Binary System Reviewed

    Sebastiano Tomassetti, Uthpala A. Perera, Giovanni Di Nicola, Mariano Pierantozzi, Yukihiro Higashi, Kyaw Thu

    Journal of Chemical and Engineering Data   65 ( 4 )   1554 - 1564   2020.4

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    Copyright © 2020 American Chemical Society. In this paper, 182 pvTz data (28 data in the two-phase region and 154 data in the superheated vapor region) of mixtures containing difluoromethane (R32) and trans-1,3,3,3-tetrafluoroprop-1-ene (R1234ze(E)) are reported. The measurements were carried out along 10 isochores (0.013173, 0.039422, 0.043115, 0.046522, 0.062966, 0.068225, 0.068959, 0.110447, 0.115156, and 0.121732 m3·kg-1) in the temperature range from 263 to 373 K for 10 R32 mole fractions (0.1677, 0.2360, 0.2551, 0.4634, 0.5374, 0.6715, 0.7383, 0.7544, 0.9532, and 0.9533). The flash method with three equations of state (EoSs) was used to assess the vapor-liquid equilibrium of the binary mixture under analysis. The calculated vapor-liquid equilibrium behavior for the R32 + R1234ze(E) binary system agreed with the experimental data collected from the open literature. The vapor-phase measurements were correlated through the aforementioned EoSs and a truncated virial EoS. These pvTz points agreed with both the values provided by the EoSs and REFPROP 10.0.

    DOI: 10.1021/acs.jced.9b00995

  • 新規低GWP単一冷媒の表面張力およびParachorの温度依存性確認と相関式評価 Reviewed

    岩崎 俊, 近藤 智恵子, 東 之弘

    日本冷凍空調学会論文集   37 ( 1 )   73 - 80   2020.3

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    Correlation Assessment and Temperature Dependence Check ofSurface Tension and Parachor for New Low-GWP Pure Refrigerants

    DOI: 10.11322/tjsrae.19-36TG_EM_OA

  • Surface Tension and Parachor Measurement of Low-Global Warming Potential Working Fluid cis-1-Chloro-2,3,3,3-tetrafluoropropene (R1224yd(Z)) Reviewed

    Chieko Kondou, Yukihiro Higashi, Shun Iwasaki

    Journal of Chemical and Engineering Data   64 ( 12 )   5462 - 5468   2019.12

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    Copyright © 2019 American Chemical Society. This article presents the accurate surface tension measurement of cis-1-chloro-2,3,3,3-tetrafluoropropene (R1224yd(Z), (Z)-CF3CFâ• CHCl), over the temperature range 266-340 K. The measurement was performed using the differential capillary rise. The expanded uncertainty at 95&#37; confidence was estimated to be within 0.19 mN·m-1. Based on the measured data, the van der Waals-type correlation expressing the temperature dependence was obtained as σ = 57.02 (1 - T/428.69)1.265 [mN·m-1]. In addition, the parachor [PR1224yd(Z)] was determined as 207. The surface tension values predicted by Miller and Thodos (Ind. Eng. Chem. Fund., 1963, 2.1, 78), Miqueu et al. (Fluid Ph. Equilibria, 2000, 172, 169), and Di Nicola et al. (Int. J. Thermophys., 2011, 34, 2243), as well as those obtained using the parachor method, were in good agreement with the measurement data.

    DOI: 10.1021/acs.jced.9b00613

  • Measurements of PvT Properties, vapor pressures, saturated densities, and critical parameters for cis-1-chloro-2,3,3,3-tetrafluoropropene (R1224yd(Z)) Reviewed

    Naoya Sakoda, Yukihiro Higashi

    Journal of Chemical and Engineering Data   64 ( 9 )   3983 - 3987   2019.9

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    Copyright © 2019 American Chemical Society. PvT properties, vapor pressures, and saturated densities for a new low-GWP refrigerant; R1224yd(Z) (cis-1-chloro-2,3,3,3-tetrafluoropropene; CF3CF=CHCl), were measured. Forty-six PvT property data were obtained along four lower density isochores in the superheated region; 22, 48, 55, and 103 kg·m-3, and three higher density isochores in the compressed liquid region; 970, 1107, and 1197 kg·m-3 at pressures up to 6.4 MPa. Fifteen vapor pressure data were obtained in the temperature range from 310 to 410 K and at pressures up to 2393 kPa, and a vapor pressure correlation was formulated based on these vapor pressure measurements. Saturated vapor and liquid densities were directly measured by the visual observation of the vapor-liquid meniscus disappearance in the critical region, and also graphically determined by the intersections of the vapor pressure curve and the isochores of the PvT properties. In addition, the critical temperature Tc = 428.69 ± 0.02 K, the critical density ρc = 535 ± 5 kg·m-3, and the critical pressure Pc = 3331 ± 3 kPa for R1224yd(Z) were determined.

    DOI: 10.1021/acs.jced.9b00374

  • Molecular simulation for surface tension of new low GWP working fluids Reviewed

    Céline Houriez, Michel Masella, Chieko Kondou, Yukihiro Higashi, Jamal El Abbadi, Christophe Coquelet

    Refrigeration Science and Technology   2019-August   460 - 467   2019.8

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    © 2019 International Institute of Refrigeration. All rights reserved. In this work, the calculated surface tension of selected new low GWP (global warming potential) pure compound refrigerants HFO (hydro-fluoro-olefin) is presented. Molecular simulation methods are used to calculate the surface tension of R-1123 (trifluoroethylene) and of R-1234ze(E) (trans-1,3,3,3-tetrafluoroprop-1-ene), as well as densities at saturation. The results obtained by molecular simulation are compared with recent experimental data.

    DOI: 10.18462/iir.icr.2019.0060

  • Performance analysis method for intermediated fluid type LNG vaporizers considering fluid properties Reviewed

    Kosuke Higashi, Chieko Kondou, Yukihiro Higashi, Shigeru Koyama

    Refrigeration Science and Technology   2019-August   437 - 444   2019.8

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    © 2019 International Institute of Refrigeration. All rights reserved. LNG (Liquefied Natural Gas) vaporizer is widely used all over the world to vaporize LNG by using seawater, etc. as a heating source. Intermediated Fluid type LNG Vaporizer (IFV) is using intermediated fluid between LNG and heating source. Propane has been used as an intermediated fluid conventionally, but new refrigerants except for propane are required because usage environment was diversified recently. In this study, refrigerants substitute for propane applicable to IFV were selected as R32 and R410A. On the basis of some experimental formula, prediction of boiling and condensation heat exchange quantity in tube bundles was also carried out and it enabled to predict actual IFV vaporization quantity with plus or minus 2 percent accuracy. The prediction demonstrated that those selected refrigerants can increase the vaporization rate with IFV from the base line of propane.

    DOI: 10.18462/iir.icr.2019.1596

  • Surface Tension Measurement for a New Low-GWP Refrigerant HFO-1123 by a Differential Capillary Rise Method Reviewed

    Chieko Kondou, Yukihiro Higashi

    日本冷凍空調学会論文集   35 ( 4 )   404 - 408   2018.12

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    By a differential capillary rise method, the surface tension was measured for a new candidate of low GWP refrigerant HFO-1123. 16 points of surface tension data with a propagated uncertainty of approximately ±0.22 mN m-1 are presented in this paper. Based on the measured data, a Van der Waals type empirical correlation was proposed for HFO-1123:
    σ = 61.02 (1-T/Tcrit)1.30 [mN m-1], where Tcrit is a critical temperature of 331.7 K measured by Higashi and Akasaka. This empirical correlation agrees with the measured surface tension data at temperatures from 267 K to 304 K.

    DOI: 10.11322/tjsrae.18-31

  • Surface tension measurement for a new low-GWP refrigerant HFO-1123 by a differential capillary rise method Reviewed

    C. Kondou, Y. Higashi

    Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers   Vol.35 ( No.4 )   403 - 408   2018.12

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  • Measurements of PvT Properties, Saturated Densities, and Critical Parameters for 3,3,3-Trifluoropropene (HFO1243zf) Reviewed

    Yukihiro Higashi, Naoya Sakoda

    Journal of Chemical and Engineering Data   63 ( 10 )   3818 - 3822   2018.10

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    Measurements of PvT properties, saturated densities, and critical parameters were carried out for a low-GWP refrigerant: 3,3,3-trifluoropropene (HFO1243zf, CF3CH=CH2). Seventy-five PvT property data points along seven isochores around the critical point were obtained in the temperature range from 328 to 430 K, in the density range between 50 and 899 kg m-3, and at pressures up to 6.9 MPa by the isochoric method. Fourteen saturated densities were obtained by the observation of meniscus disappearance in the critical region. On the basis of these measurements, the critical parameters of Tc = 376.93 ± 0.01 K and ρc = 414 ± 3 kg m-3 were determined. The present results are compared to an available equation of state.

    DOI: 10.1021/acs.jced.8b00452

  • R1123,R1234yfおよびR32からなる2成分系混合冷媒の気液平衡測定

    中崎 雅也, 江 世恒, 迫田 直也, 高田 保之, 東 之弘

    日本機械学会九州支部講演論文集   2018 ( 0 )   F11   2018.3

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    Vapor-Liquid Equilibrium Measurements of Binary Refrigerant Mixtures Composed of R1123, R1234yf and R32

    DOI: 10.1299/jsmekyushu.2018.71.F11

  • Measurements of Saturation Pressures for Trifluoroethene (R1123) and 3,3,3-Trifluoropropene (R1243zf) Reviewed

    Yukihiro Higashi, Naoya Sakoda, Md Amirul Islam, Yasuyuki Takata, Shigeru Koyama, Ryo Akasaka

    Journal of Chemical and Engineering Data   63 ( 2 )   417 - 421   2018.2

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    Saturation pressures for new low global warming potential refrigerants trifluoroethene (R1123, CF2= CHF) and 3,3,3-trifluoropropene (R1243zf, CF3CH=CH2) were measured by the isochoric method for temperatures between 278 and 377 K. Temperature was measured with a 25 standard platinum resistance thermometer on ITS-90. Pressure was measured with a digital quartz pressure transducer. The experimental uncertainties in temperature and pressure are estimated to be 5 mK and 1 kPa (k = 2), respectively. New saturation-pressure correlations for the refrigerants have been formulated based on the present saturation-pressure data. The critical pressures of R1123 and R1243zf were also determined.

    DOI: 10.1021/acs.jced.7b00818

  • Gaseous PVT Property Measurements of cis-1,3,3,3-Tetrafluoropropene Reviewed

    Naoya Sakoda, Jiang Shiheng, Masamichi Kohno, Shigeru Koyama, Yukihiro Higashi, Yasuyuki Takata

    Journal of Chemical and Engineering Data   62 ( 7 )   2178 - 2182   2017.7

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    PVT properties in the vapor phase of cis-1,3,3,3-tetrafluoropropene (R1234ze(Z)) were measured by a multiple expansion method in the temperature range from 353 to 413 K and at pressures up to 2.7 MPa. Thirty data along four isotherms are obtained in the temperatures between 353 and 413 K. The vapor pressures at the temperatures were also measured by adding a sample of R1234ze(Z) to a sample cell at the vapor-liquid equilibrium conditions. The uncertainties in temperature and pressure measurements are estimated to be within 6 mK and 0.3 kPa, respectively. The expanded uncertainty in density measurement is estimated within no greater than 0.12% (k = 2). The obtained PVT properties and vapor pressures are compared with the existing equation of state.

    DOI: 10.1021/acs.jced.7b00263

  • Vapor-liquid Equilibrium Measurements of HFO Refrigerant Mixtures Reviewed International journal

    N. Sakoda, Jieng Shiheng, M. Kohno, S. Koyama, Y. Higashi, Y. Takata

    5th IIR Conference of Thermophysical Properties and Transfer Processes of Refrigeration, Seoul, South Korea   548 - 551   2017.5

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  • Low-GWP refrigerants Reviewed

    J. Steven Brown, Claudio Zilio, Ryo Akasaka, Yukihiro Higashi

    Science and Technology for the Built Environment   22 ( 8 )   1075 - 1076   2016.11

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    DOI: 10.1080/23744731.2016.1230981

  • Measurements of thermodynamic properties for the 50 mass&#37; R1234yf + 50 mass&#37; R1234ze(E) blend Reviewed

    Yukihiro Higashi

    Science and Technology for the Built Environment   22 ( 8 )   1185 - 1190   2016.11

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    Copyright © 2016 ASHRAE. Measurements of pressure-density-temperature-composition properties, saturated densities, and critical parameters for the low-global warming potential refrigerant blend of the 50 mass&#37; R1234yf (2,3,3,3-tetrafluoroprop-1-ene; CF3CF = CH2) + 50 mass&#37; R1234ze(E) (trans-1,3,3,3-tetrafluoroprop-1-ene; CF3CH = CHF) were measured with two types of isochoric methods. As for the PρTx properties, 38 data along five isochores in one phase region were obtained by the isochoric method. This measurement was made in the range of temperatures from 340 to 430 K, of pressures from 1693 to 6774 kPa, and of densities from 100 to 900 kg·m−3. As for the saturated densities, nine saturated vapor densities and six saturated liquid densities were measured by the direct observation of meniscus disappearance. These experimental data were obtained in the temperature range from 354.62 to 374.28 K and densities between 219 and 870 kg·m−3. On the basis of the present data, the critical temperature Tc = 374.28 K, critical density ρc = 480 kg·m−3, and critical pressure Pc = 3524 kPa for the 50mass&#37; R1234yf + 50mass&#37; R1234ze(E) blend were determined. In addition the critical locus correlations corresponding the composition were proposed for the R1234yf + R1234ze(E) blend.

    DOI: 10.1080/23744731.2016.1223975

  • Measurements of thermodynamic properties for the binary R 245fa + R 134a mixture:2nd Report : Measurements of PρTx properties and critical pressure – Reviewed

    Y. Higashi, R. Akasaka

    日本冷凍空調学会論文集   Vol.33 ( No.1 )   81 - 92   2016.9

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  • Measurements of thermodynamic properties for the binary R 245fa + R 134a mixture:1st Report : Measurements of vapor-liquid coexistence curve and critical locus – Reviewed

    Y. Higashi

    日本冷凍空調学会論文集   Vol.33 ( No.1 )   73 - 79   2016.9

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  • 2成分系混合作動流体 R 245fa + R 134a 系の熱力学的性質の測定:-第2報:PρTx 性質および臨界圧力の測定- Reviewed

    Yukihiro Higashi, 赤坂 亮

    日本冷凍空調学会論文集   0 ( 0 )   2016

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    Measurements of Thermodynamic Properties for the Binary R 245fa + R 134a Mixture:- 2nd Report

    DOI: 10.11322/tjsrae.15-46_OA

  • 2成分系混合作動流体 R 245fa + R 134a 系の熱力学的性質の測定:-第1報:気液共存曲線および臨界軌跡の測定- Reviewed

    Yukihiro Higashi

    日本冷凍空調学会論文集   0 ( 0 )   2016

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    Measurements of Thermodynamic Properties for the Binary R 245fa + R 134a Mixture:- 1st Report

    DOI: 10.11322/tjsrae.15-45_OA

  • Thermodynamic properties of 1,1,1,2-tetrafluoroethane (R-134a) + 2,3,3,3-tetrafluoropropene (R-1234yf) mixtures: Measurements of the critical parameters and a mixture model based on the multi-fluid approximation Reviewed

    Ryo Akasaka, Yukihiro Higashi, Yasufu Yamada, Takashi Shibanuma

    International Journal of Refrigeration   58   146 - 153   2015.10

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    © 2015 Elsevier Ltd and IIR. All rights reserved. Thermodynamic properties are discussed for 1,1,1,2-tetrafluoroethane (R-134a) + 2,3,3,3-tetrafluoropropene (R-1234yf) mixtures. The critical temperatures, densities, and pressures experimentally determined are first presented with their uncertainties. Subsequently a mixture model for calculations of thermodynamic properties is formulated using the multi-fluid approximation. Comparisons to experimental data show that the mixture model calculates the vapor-liquid equilibrium and densities of the mixtures with reasonable accuracies. The critical parameters are also well represented by the mixture model.

    DOI: 10.1016/j.ijrefrig.2015.06.011

  • Thermoelectric properties of layered FeSi2 thermoelectric conversion module produced by Spark Plasma Sintering Method Reviewed

    Hironori Suzuki, Yukihiro Higashi, Takuya Yasuno

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   62 ( 9 )   457 - 461   2015.9

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    The 5 pair layered FeSi2 thermoelectric conversion module was manufactured by sintering five layers of p type and n type powder at the same time, using SPS (spark plasma sintering) method. This process is expected to have higher reliability and shorter manufacturing time compared with conventional process which is performed by joining machined p type and n type element with the electrode. Maximum power of 32.4 mW was provided by this module under the condition of heating temperature 773 K and cooling temperature 293 K. The changes of the module shape and sintering condition greatly changed the performance of this module. By the optimization of the sintering condition and the shape, the performance of this process can be expected to be higher. To obtain the high performance it is necessary to develop the module shape which has large temperature difference with low electric resistance and sintering condition which enable low thermal conductivity with high density.

    DOI: 10.2497/jjspm.62.457

  • Thermoelectric properties of layered FeSi<inf>2</inf> thermoelectric conversion module produced by Spark Plasma Sintering Method Reviewed

    Hironori Suzuki, Yukihiro Higashi, Takuya Yasuno

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   62 ( 9 )   457 - 461   2015.9

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    The 5 pair layered FeSi2 thermoelectric conversion module was manufactured by sintering five layers of p type and n type powder at the same time, using SPS (spark plasma sintering) method. This process is expected to have higher reliability and shorter manufacturing time compared with conventional process which is performed by joining machined p type and n type element with the electrode. Maximum power of 32.4 mW was provided by this module under the condition of heating temperature 773 K and cooling temperature 293 K. The changes of the module shape and sintering condition greatly changed the performance of this module. By the optimization of the sintering condition and the shape, the performance of this process can be expected to be higher. To obtain the high performance it is necessary to develop the module shape which has large temperature difference with low electric resistance and sintering condition which enable low thermal conductivity with high density.

    DOI: 10.2497/jjspm.62.457

  • Thermoelectric properties of FeSi<inf>2</inf> thermoelectric conversion modules sintered with Ag joint plates by spark plasma sintering method Reviewed

    Hironori Suzuki, Shinya Waragai, Yukihiro Higashi, Yuki Takasawa, Takuya Yasuno

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   62 ( 6 )   313 - 317   2015.6

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    © 2015, Journal of the Japan Society of Powder and Powder Metallurgy. All rights reserved. To achieve high performance of thermoelectric conversion module, it is important that the contact electric resistance between thermoelectric element and electrode is decreased. The manufacturing method to perform sintering of FeSi2 powder and joining of the sintered body with Ag metal plates at the same time was examined by using SPS(spark plasma sintering) method. The Ag plates were successfully joined to FeSi2 element by this process. In addition, it was able to lower the resistance of thermoelectric conversion module because the contact electric resistance between the FeSi2 element and the Cu electrode was decreased by joining Ag plates. The thermoelectric conversion modules with various element heights were produced by this process, and the performance of the modules was evaluated under several temperature differences. The most suitable thermoelectric module height, 5 mm, was decided by investigating relations of the module height and the performance. The FeSi2 thermoelectric conversion module consisting of 50 pairs of p-n elements was produced using an element with 5 mm height, and the performance was measured. As a result, the maximum electric power of FeSi2 thermoelectric conversion module of 50 pairs was 1.70 W in the condition of heating temperature at 873 K and/or cooling temperature at 293 K.

    DOI: 10.2497/jjspm.62.313

  • Surface tension of low GWP refrigerants R1243zf, R1234ze(Z), and R1233zd(E) Reviewed

    Chieko Kondou, Ryuichi Nagata, Noriko Nii, Shigeru Koyama, Yukihiro Higashi

    International Journal of Refrigeration   53   80 - 89   2015.5

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    Abstract The surface tension of R1243zf, R1234ze(Z), and R1233zd(E) were measured at temperatures from 270 K to 360 K by an experimental apparatus based on the differential capillary rise method. The deviation between the measured surface tension of R134a and R245fa and the calculated surface tension with REFPROP 9.1 (Lemmon et al., 2013) was ±0.13 mN m-1, which is less than the estimated propagated uncertainty in surface tension of ±0.2 mN m-1. Eleven points, thirteen points, and ten points of surface tension data were provided for R1243zf, R1234ze(Z), and R1233zd(E), respectively, in this paper. The measured data and the estimated surface tension using the methods of Miller (1963), Miqueu et al. (2000), and Di Nicola et al. (2011) agree within the standard deviation of ±0.43 mN m-1. The empirical correlations that represent the measured data within ±0.14 mN m-1 were proposed for each refrigerant.

    DOI: 10.1016/j.ijrefrig.2015.01.005

  • Surface tension of low GWP refrigerants R1243zf, R1234ze(Z), and R1233zd(E) Reviewed

    Chieko Kondou, Ryuichi Nagata, Noriko Nii, Shigeru Koyama, Yukihiro Higashi

    International Journal of Refrigeration   53   80 - 89   2015.5

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    © 2015 Elsevier Ltd and IIR. All rights reserved. Abstract The surface tension of R1243zf, R1234ze(Z), and R1233zd(E) were measured at temperatures from 270 K to 360 K by an experimental apparatus based on the differential capillary rise method. The deviation between the measured surface tension of R134a and R245fa and the calculated surface tension with REFPROP 9.1 (Lemmon et al., 2013) was ±0.13 mN m-1, which is less than the estimated propagated uncertainty in surface tension of ±0.2 mN m-1. Eleven points, thirteen points, and ten points of surface tension data were provided for R1243zf, R1234ze(Z), and R1233zd(E), respectively, in this paper. The measured data and the estimated surface tension using the methods of Miller (1963), Miqueu et al. (2000), and Di Nicola et al. (2011) agree within the standard deviation of ±0.43 mN m-1. The empirical correlations that represent the measured data within ±0.14 mN m-1 were proposed for each refrigerant.

    DOI: 10.1016/j.ijrefrig.2015.01.005

  • Development and implementation of a radiation study program through collaboration between schools and university Reviewed

    T. Ishikawa, Y. Higashi

    エネルギー環境教育研究   Vol.9 ( No.2 )   35 - 42   2015.2

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  • 放電プラズマ焼結法により作製された積層型FeSi2熱電変換モジュールの熱電変換特性 Reviewed

    鈴木 裕宣, 東 之弘, 安野 拓也

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   62 ( 9 )   457 - 461   2015

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    Thermoelectric Properties of layered FeSi2 Thermoelectric Conversion Module Produced by Spark Plasma Sintering Method

    DOI: 10.2497/jjspm.62.457

  • 放電プラズマ焼結法により焼結・接合したAg層を有するFeSi2熱電変換モジュールの熱電変換特性 Reviewed

    鈴木 裕宣, 藁谷 真也, 東 之弘, 髙澤 勇輝, 安野 拓也

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   62 ( 6 )   313 - 317   2015

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    Thermoelectric Properties of FeSi2 Thermoelectric Conversion Modules Sintered with Ag Joint Plates by Spark Plasma Sintering Method

    DOI: 10.2497/jjspm.62.313

  • A fundamental equation of state for cis-1,3,3,3-tetrafluoropropene (R-1234ze(Z)) Reviewed

    Ryo Akasaka, Yukihiro Higashi, Akio Miyara, Shigeru Koyama

    International Journal of Refrigeration   44   168 - 176   2014.8

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    A fundamental equation of state is presented for cis-1,3,3,3- tetrafluoropropene (R-1234ze(Z)). The equation of state is expressed explicitly in the Helmholtz energy with independent variables of temperature and density. The equation of state is based on experimental data for the critical parameters, vapor pressures, densities of the liquid and vapor phases, and sound speeds in the vapor phase. All thermodynamic properties can be derived as derivatives of the Helmholtz energy. The equation is valid for temperatures from 273 K to 430 K and for pressures up to 6 MPa. The estimated uncertainties of properties calculated from the equation are 0.15&#37; in vapor pressures, 0.4&#37; in vapor densities, 0.2&#37; in liquid densities, and 0.05&#37; in the vapor phase sound speeds. The equation exhibits reasonable extrapolation behavior in regions away from the experimental data. © 2014 Elsevier Ltd and IIR. All rights reserved.

    DOI: 10.1016/j.ijrefrig.2013.12.018

  • Renewable energy education in cooperation with schools, the prefecture, the media, and the universities Reviewed

    T. Ishikawa, Y. Higashi

    エネルギー環境教育研究   Vol.8 ( No.2 )   23 - 30   2014.2

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  • Surface Tensions of trans-1,3,3,3-Tetrafluoropropene and trans-1,3,3,3-Tetrafluoropropene+Difluoromethane Mixture Reviewed

    Katsuyuki Tanaka, Yukihiro Higashi

    Journal of Chemical Engineering of Japan   46 ( 4 )   371 - 375   2013.7

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  • Measurements of saturated densities and critical parameters for the binary mixture of 2,3,3,3-tetrafluoropropene (R-1234yf) + difluoromethane (R-32) Reviewed

    Ryo Akasaka, Katsuyuki Tanaka, Yukihiro Higashi

    International Journal of Refrigeration   36 ( 4 )   1341 - 1346   2013.6

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    The vapor-liquid coexistence curves near the critical point of the binary mixture of 2,3,3,3-tetrafluoropropene (R-1234yf) + difluoromethane (R-32) were measured by means of the visual observation of meniscus disappearance. Eleven, eighteen, and eleven saturated densities were obtained for mixtures with 50.00 mass&#37;, 80.01 mass&#37;, and 90.00 mass&#37; of R-1234yf, respectively. The critical temperatures, critical densities, and critical molar volumes of the mixtures were determined from the meniscus disappearing level and the intensity of the critical opalescence. The critical pressures of the mixtures were also determined from the analysis of pρTx measurements. The composition dependence of the critical parameters was formulated with simple correlations. © 2013 Elsevier Ltd and IIR. All rights reserved.

    DOI: 10.1016/j.ijrefrig.2013.02.005

  • Surface tensions of trans-1,3,3,3-tetrafluoropropene and trans-1,3,3,3-tetrafluoropropene+difluoromethane mixture Reviewed

    Katsuyuki Tanaka, Yukihiro Higashi

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   46 ( 6 )   371 - 375   2013.6

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    The surface tensions of trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) alone and when mixed with difluoromethane (HFC-32) were measured using the differential capillary-rise method. Twenty-three data points for HFO-1234ze(E) were obtained in the temperature range 273-333 K. Twenty-six data points for the 50.00 mass% HFO-1234ze(E)+50.00 mass% HFC-32 mixture were obtained in the temperature range from 273-323 K. The experimental uncertainty of the surface tension was estimated to be 0.2 mN m-1 for pure HFO-1234ze(E) and 0.3 mN m-1 for the fluid mixture. Based on the obtained data, the surface tension correlations for HFO-1234ze(E) and the HFO-1234ze(E)+HFC-32 mixture were formulated. The correlations can represent the data with a standard deviation of 0.06 mN m-1 for HFO-1234ze(E) and 0.18 mN m_1 for the HFO-1234ze(E)+HFC-32 mixture.

    DOI: 10.1252/jcej.13we021

  • 3成分系R‐1234ze(E)+R‐32+CO2混合冷媒の熱力学性質の測定

    東之弘, 宮良明男, 小山繁

    日本機械学会熱工学コンファレンス講演論文集   2012   1 - 2   2012.11

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    3成分系R‐1234ze(E)+R‐32+CO2混合冷媒の熱力学性質の測定

  • Energy and environmental education activities in Iwaki city after earthquake, tsunami, and nuclear power plant accident Reviewed

    T. Ishikawa, Y. Higashi

    エネルギー環境教育研究   Vol.6 ( No.2 )   79 - 82   2012.2

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  • Recovering from the great East Japan earthquake Reviewed

    H. Kimura, T. Ishikawa, Y. Higashi

    エネルギー環境教育研究   Vol.6 ( No.2 )   83 - 86   2012.2

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  • Energy education for disaster protection targeted the schools of Pacific-ocean side in Iwaki-city Reviewed

    T. Ishikawa, Y. Higashi

    エネルギー環境教育研究   Vol.7 ( No.1 )   13 - 16   2012.1

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  • HFO-1234ze(E)+HFC-32混合冷媒の密度および定圧比熱の測定 Reviewed

    田中 勝之, 赤坂 亮, Yukihiro Higashi

    日本冷凍空調学会論文集   28 ( 4 )   427 - 434   2011.12

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    Measurements of Density and Isobaric Specific Heat Capacity for HFO-1234ze(E)+HFC-32 Mixtures

  • HFO-1234ze(E)+HFC-32混合冷媒のPρTχ性質の測定 Reviewed

    小林 恵三, 田中 勝之, Yukihiro Higashi

    日本冷凍空調学会論文集   28 ( 4 )   415 - 426   2011.12

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    <tt>An experimental apparatus for measuring </tt><tt>PρTx </tt><tt>(pressure-density-temperature-composition) properties along isochores was constructed. After the calibration of pressure sensor and the determination of the inner volume of sample vessel, the reproducibility of the experimental apparatus was confirmed by the measurement of isochores for pure HFC-134a (1,1,1,2-tetrafluoroethane). The </tt><tt>PρTx </tt><tt>properties of the 50 mass&#37; HFO-1234ze(E) (trans-1,3,3,3-tetrafluoropropene) + 50 mass&#37; HFC-32 (difluoromethane) mixtures and those of the 75 mass&#37; HFO-1234ze(E) + 25 mass&#37; HFC-32 mixtures were measured for five isochores including 128 </tt><tt>PρTx </tt><tt>property data points and for seven isochores including 188 </tt><tt>PρTx </tt><tt>property data points, respectively. The critical pressures were determined from the present isochores close to the critical density against the critical temperature. The relationship between pressure and temperature at vapor-liquid equilibrium was graphically determined from thepresentisochores</tt><tt>. </tt>

    DOI: 10.11322/tjsrae.28.415

  • PρTx property measurements of binary HFO-1234ze(E) + HFC-32 refrigerant mixtures Reviewed

    K. Kobayashi, K. Tanaka, Y. Higashi

    日本冷凍空調学会論文集   Vol.28 ( No.4 )   415 - 426   2011.10

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  • HFO-1234yfの気相域におけるPpT性質 Reviewed

    田中 勝之, Yukihiro Higashi

    日本冷凍空調学会論文集   28 ( 1 )   51 - 61   2011.3

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  • オレフィン系冷媒R 1234yfおよびR 1234ze(E)の熱力学性質に関する研究動向 Reviewed

    赤坂 亮, 粥川 洋平, 田中 勝之, Yukihiro Higashi

    日本冷凍空調学会論文集   28 ( 1 )   1 - 17   2011.3

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    A Review of Study on Thermodynamic Properties of Hydrofluoroolefin Refrigerants R 1234yf and R 1234ze(E)

  • 冷媒の変遷と将来 性能重視から環境重視への選択肢へ

    Yukihiro Higashi

    冷凍   86 ( 1000 )   94 - 99   2011.2

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  • PρT property for HFO-1234yf in the gaseous phase Reviewed

    K. Tanaka, Y. Higashi

    日本冷凍空調学会論文集   Vol.28 ( No.1 )   51 - 61   2011.1

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  • HFO-1234ze(E)+HFC-32 混合冷媒の密度および定圧比熱の測定 Reviewed

    田中 勝之, 赤坂 亮, Yukihiro Higashi

    日本冷凍空調学会論文集   28 ( 4 )   427 - 434   2011

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    Measurements of Density and Isobaric Specific Heat Capacity for HFO-1234ze(E)+HFC-32 Mixtures

    DOI: 10.11322/tjsrae.28.427

  • オレフィン系冷媒R 1234yf およびR 1234ze(E) の熱力学性質に関する研究動向 Reviewed

    赤坂 亮, 粥川 洋平, 田中 勝之, Yukihiro Higashi

    日本冷凍空調学会論文集   28 ( 1 )   1 - 17   2011

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    A Review of Study on Thermodynamic Properties of Hydrofluoroolefin Refrigerants R 1234yf and R 1234ze(E)

    DOI: 10.11322/tjsrae.28.1

  • P p T property measurements for trans -1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) in the gaseous phase Reviewed

    Katsuyuki Tanaka, Yukihiro Higashi

    Journal of Chemical and Engineering Data   55 ( 11 )   5164 - 5168   2010.11

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    Measurements of the PpT properties for trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) in the gaseous phase were carried out using metal bellows volumometer. A total of 204 PpT property values was obtained in the range of temperatures from (310 to 360) K, pressures from (657 to 2300) kPa, and densities from (34 to 146) kg•m-3. The sample purity was better than 99.96 &#37; in mole fraction. The present data were compared with the existing data and equations of state. The Benedict-Webb-Rubin-Starling (BWRS) and Martin-Hou equations of state were used to correlate the present data. © 2010 American Chemical Society.

    DOI: 10.1021/je100707s

  • Measurements of the isobaric specific heat capacity and density for dimethyl ether in the liquid state Reviewed

    Katsuyuki Tanaka, Yukihiro Higashi

    Journal of Chemical and Engineering Data   55 ( 8 )   2658 - 2661   2010.8

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    The isobaric specific heat capacity and density for dimethyl ether were measured in the temperature range from (310 to 360) K at pressures up to 5 MPa in the liquid state. Measurements were conducted by the metal-bellows calorimeter. The uncertainties of isobaric specific heat capacity and density measurements were estimated to be less than 5 &#37; and 0.2 &#37;, respectively. Experimental values for the isobaric specific heat capacity and density were correlated as functions of pressure and temperature. In addition, the saturated liquid isobaric specific heat capacity and saturated liquid density were obtained from extrapolation of these correlations to the vapor pressure. © 2010 American Chemical Society.

    DOI: 10.1021/je900922x

  • Measurements of the isobaric specific heat capacities for trans -1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) in the liquid phase Reviewed

    Katsuyuki Tanaka, Gen Takahashi, Yukihiro Higashi

    Journal of Chemical and Engineering Data   55 ( 6 )   2267 - 2270   2010.6

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    The isobaric specific heat capacity of trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) in the liquid phase was measured using a metal-bellows calorimeter. Twenty-six data points were obtained in the temperature range from (310 to 370) K and pressure range from (2 to 5) MPa. The relative experimental uncertainty of the isobaric specific heat capacity was estimated to be 5 &#37;. On the basis of the present data, the correlation of the isobaric specific heat capacity in the liquid phase was formulated as functions of temperature and pressure. The heat capacities of saturated liquid were derived from this correlation by substituting the vapor pressure. © 2010 American Chemical Society.

    DOI: 10.1021/je900799e

  • Measurements of the vapor pressures and p ρ T properties for trans -1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) Reviewed

    Katsuyuki Tanaka, Gen Takahashi, Yukihiro Higashi

    Journal of Chemical and Engineering Data   55 ( 6 )   2169 - 2172   2010.6

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    Measurements of the vapor pressures and p ρ T properties for trans -1,3,3,3-tetrafluoropropene (HFO-1234ze(E))
    The vapor pressures and pρT properties for trans-1,3,3,3- tetrafluoropropene (HFO-1234ze(E)) are measured using a metal-bellows cell. As for the vapor pressure, eight data points are obtained in the temperature range from (310 to 380) K and pressure range from (703 to 3458) kPa. The data of the vapor pressure is correlated by the Wagner type equation with the absolute average deviation of 0.02 &#37;. By extrapolating the vapor-pressure correlation to the critical temperature, the critical pressure is determined to be 3632 kPa. The acentric factor is also determined to be 0.296 by using the vapor-pressure correlation. As for the pρT properties, 26 data points are obtained in the temperature range from (310 to 370) K and pressure range from (2000 to 5000) kPa. The data of the pρT properties are correlated by the Sato equation with the absolute average deviation of 0.04 &#37;. Seven data points of the saturated liquid density are obtained by extrapolating the correlation of the pρT properties to the vapor pressure. © 2010 American Chemical Society.

    DOI: 10.1021/je900756g

  • Thermodynamic properties of HFO-1234yf (2,3,3,3-tetrafluoropropene) Reviewed

    Katsuyuki Tanaka, Yukihiro Higashi

    International Journal of Refrigeration   33 ( 3 )   474 - 479   2010.5

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    Measurements of the thermodynamic properties of HFO-1234yf were conducted. The critical temperature TC, critical density ρC, and critical pressure PC, were measured by the visual observation of the meniscus disappearance, and were determined to be 367.85 ± 0.01 K, 478 ± 3 kg/m3, and 3382 ± 3 kPa, respectively. Vapor pressures were measured by a batch-type calorimeter with a metal-bellows in the temperature range from 310 K to 360 K and correlated by the Wagner-type equation. Surface tensions were measured by the differential capillary-rise method in the temperature range from 273 K to 340 K and correlated by the van der-Waals type equation. The acentric factor was determined to be 0.280 with the vapor pressure correlation. Based on the critical parameters and acentric factor, saturated vapor and liquid densities were estimated by the Peng-Robinson equation and the Hankinson-Thomson equation, respectively. The heat of vaporization was also calculated from the Clausius-Clapeyron equation.

    DOI: 10.1016/j.ijrefrig.2009.10.003

  • Critical parameters and saturated densities in the critical region for trans -1,3,3,3-Tetrafluoropropene (HFO-1234ze(E)) Reviewed

    Yukihiro Higashi, Katsuyuki Tanaka, Tomohide Ichikawa

    Journal of Chemical and Engineering Data   55 ( 4 )   1594 - 1597   2010.4

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    Measurements of the saturated vapor and liquid densities near the critical point for trans-1,3,3,3-tetrafluoropropene (CFH=CHCF3; HFO-1234ze(E)) were carried out in the reduced temperature range of 0.962 < T/Tc < 1 and in the reduced density range of 0.40 < ρ/ρc < 1.70. Taking into consideration the meniscus disappearing level as well as the intensity of the critical opalescence, the critical temperature T c and critical density ρc were determined experimentally. The critical pressure Pc was calculated by extrapolating the vapor-pressure equation to the critical temperature. The critical parameters reported in this paper are Tc = (382.51 ± 0.01) K, ρc = (486 ± 3) kgm-3, Vc = (235 ± 2) cm3mol-1, and Pc = (3632 ± 3) kPa. The saturated liquid density correlation is formulated using the present data. In addition, the critical exponent β along the coexistence curve was also discussed. © 2009 American Chemical Society.

    DOI: 10.1021/je900696z

  • Measurements of the isobaric specific heat capacity for 1,1,1-trifluoroethane (R143a), pentafluoroethane (R125), and difluoromethane (R32) in the liquid phase Reviewed

    Katsuyuki Tanaka, Yukihiro Higashi

    Journal of Chemical and Engineering Data   55 ( 4 )   1516 - 1518   2010.4

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    Measurements of the isobaric specific heat capacity for the hydrocarbons 1,1,1-trifluoroethane (R143a), pentafluoroethane (R125), and difluoromethane (R32) were carried out in the liquid phase at a pressure of 5 MPa by using a batch type calorimeter equipped with a metal bellows. Ten data points of the isobaric specific heat capacity for R143a, 11 data points for R125, and seven data points for R32 were obtained in the temperature range from (310 to 350) K and at a pressure of 5 MPa. The experimental uncertainties are estimated to be 5 mK for temperature, 3 kPa for pressure, and 5.2 &#37; for isobaric specific heat capacity. The present results were compared with the literature data and the values calculated from the equation of state. The correlations of the isobaric specific heat capacity were formulated as a function of temperature at a pressure of 5 MPa. Maximum deviations of the present results from correlations were 1.4 &#37; for R143a, 1.5 &#37; for R125, and 0.9 &#37; for R32, respectively. © 2009 American Chemical Society.

    DOI: 10.1021/je900661c

  • Measurements of the isobaric specific heat capacity and density for HFO-1234yf in the liquid state Reviewed

    Katsuyuki Tanaka, Yukihiro Higashi, Ryo Akasaka

    Journal of Chemical and Engineering Data   55 ( 2 )   901 - 903   2010.3

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    The isobaric specific heat capacity and density of the HFO-1234yf (2,3,3,3-tetrafluoropropene, CH2=CFCF3) in the liquid state have been measured in the temperature range from (310 to 360) K at pressures up to 5 MPa. The uncertainties in temperature, pressure, isobaric specific heat capacity, and density measurements were estimated to be less than 5 mK, 3 kPa, 5 %, and 0.2 %, respectively. A sample with purity of 99.99 mol % or greater was used for the measurement. Experimental values for the isobaric specific heat capacity were correlated as a function of pressure along isotherms, and those for density were correlated as functions of pressure and temperature. In addition, the saturated liquid isobaric specific heat capacity and density were obtained from extrapolation of these correlations to the vapor pressure.

    DOI: 10.1021/je900515a

  • Thermodynamic property modeling for 2,3,3,3-tetrafluoropropene (HFO-1234yf) Reviewed

    Ryo Akasaka, Katsuyuki Tanaka, Yukihiro Higashi

    International Journal of Refrigeration   33 ( 1 )   52 - 60   2010.1

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    This paper presents a timely and reliable equation of state for 2,3,3,3-tetrafluoropropene (HFO-1234yf) whose thermodynamic property information is strongly desired. The Patel-Teja (PT) equation of state and the extended corresponding state (ECS) model have been individually applied to property modeling for this new refrigerant. Comparisons of predicted values with the equation/model were made with the most recent experimental data. Both the PT equation of state and the ECS model can represent the vapor pressures with an accuracy of 0.2%. However, the ECS model is much better than the PT equation of state in the predictions for the liquid density and isobaric heat capacity. The uncertainties of calculated values with the ECS model are 0.5% in liquid density and 2.5% in isobaric heat capacity. The use of the ECS model is recommended for a detailed assessment of HFO-1234yf. Thermodynamic property tables and diagrams generated using the ECS model are provided.

    DOI: 10.1016/j.ijrefrig.2009.09.004

  • Thermodynamic property modeling for 2,3,3,3-tetrafluoropropene (HFO-1234yf) Reviewed

    Ryo Akasaka, Katsuyuki Tanaka, Yukihiro Higashi

    International Journal of Refrigeration   33 ( 1 )   52 - 60   2010.1

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    This paper presents a timely and reliable equation of state for 2,3,3,3-tetrafluoropropene (HFO-1234yf) whose thermodynamic property information is strongly desired. The Patel-Teja (PT) equation of state and the extended corresponding state (ECS) model have been individually applied to property modeling for this new refrigerant. Comparisons of predicted values with the equation/model were made with the most recent experimental data. Both the PT equation of state and the ECS model can represent the vapor pressures with an accuracy of 0.2%. However, the ECS model is much better than the PT equation of state in the predictions for the liquid density and isobaric heat capacity. The uncertainties of calculated values with the ECS model are 0.5% in liquid density and 2.5% in isobaric heat capacity. The use of the ECS model is recommended for a detailed assessment of HFO-1234yf. Thermodynamic property tables and diagrams generated using the ECS model are provided. © 2009 Elsevier Ltd and IIR.

    DOI: 10.1016/j.ijrefrig.2009.09.004

  • Development of temperature-change sensor by thermoelectric elements and its response evaluation on dropping into water Reviewed

    Katsuyuki Tanaka, Takuya Yasuno, Yukihiro Higashi, Shunichi Okuzaki, Tatsuo Katakura

    Heat Transfer - Asian Research   38 ( 8 )   507 - 519   2009.12

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    A temperature-change sensor by thermoelectric elements that is directly connected to a p-type element and an n-type element was developed. A β-FeSi2 thermo-electric semiconductor made by a spark plasma sintering method was used as a prototype sensor. Evaluation of this thermoelectric temperature-change sensor was carried out by measuring its electromotive force when it was dropped into a thermo-stated water bath. It was confirmed that there existed a correlation between the temperature difference and the electromotive force of the sensor, i.e., approximately 5 mV of electromotive force was generated at a temperature difference of 30 K. In addition, the dependence of electromotive force on the size and properties of the thermoelectric elements was evaluated by carrying out FEM analysis. © 2009 Wiley Periodicals, Inc.

    DOI: 10.1002/htj.20268

  • Approach for regional base university of energy education Reviewed

    Y. Higashi

    Journal of the Japan Institute of Energy   Vol.88   15 - 21   2009.9

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  • Development of temperature-change sensor by thermoelectric elements and its response evaluation on dropping into water Reviewed International journal

    K. Tanaka, T. Yasuno, Y. Higashi, S. Okuzaki, T. Katakura

    Heat Transfer – Asian Research   Vol.38 ( No.8 )   507 - 519   2009.8

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  • Measurements of the surface tension for the R290 + R32 mixture Reviewed

    Katsuyuki Tanaka, Yukihiro Higashi

    Journal of Chemical and Engineering Data   54 ( 6 )   1656 - 1659   2009.6

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    There were no data of the surface tension for the R290 + R32 mixture which is expected as one of the new refrigerant mixtures, and its prediction is considered to be difficult because it is a mixture of a very polar molecule with a nonpolar molecule. In this work, the surface tension measurements for the R290 + R32 mixture were carried out by the differential capillary-rise method modified for measuring mixtures. Thirtyone, thirty-five, and thirty-three data points were obtained with changing the composition of the mixture at T = 280 K, 290 K, and 300 K, respectively. The experimental uncertainties of temperature and surface tension are estimated to be within 20 mK and 0.2 mN·m -1, respectively. The excess molar surface tension is also calculated by the present data, and its uncertainty was estimated to be 0.3 mN·m-1. The excess molar surface tension was correlated as a function of composition. The deviation of the present data from the present correlation was within the experimental uncertainty. © 2009 American Chemical Society.

    DOI: 10.1021/je800756r

  • Measurements of the vapor - Liquid equilibrium for the CO<inf>2</inf> + R290 mixture Reviewed

    Katsuyuki Tanaka, Yukihiro Higashi, Ryo Akasaka, Yohei Kayukawa, Kenich Fujii

    Journal of Chemical and Engineering Data   54 ( 3 )   1029 - 1033   2009.3

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    Vapor - liquid equilibrium (VLE) of the CO2 + R290 mixture has been measured by the recirculation method. Thirty-three data sets of VLE measurements were obtained in the temperature range between (260 and 290) K and in the pressure range between (408 and 4710) kPa. The experimental uncertainties of the temperature, pressure, and composition measurements are estimated to be within 3 mK, 3 kPa, and 0.11 &#37;, respectively. The present data were compared with the calculation by the REFPROP and correlated well by two cubic equations of state, i.e., the Peng - Robinson equation and the Soave - Redlich - Kwong equation. © 2009 American Chemical Society.

    DOI: 10.1021/je800938s

  • Development of the temperature-change sensor by thermoelectric elements and response evaluation on dropping into water Reviewed

    K. Tanaka, T. Yasuno, Y. Higashi, S. Okuzaki, T. Katakura

    熱物性   Vol.23 ( No.1 )   14 - 20   2009.1

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  • Approach for "regional base university of energy education" Reviewed

    Yukihiro Higashi

    Nihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy   88 ( 1 )   15 - 21   2009.1

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    As for the plan of Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry, the Information Center for Energy and Environment Education is tackling to the program for the regional base university of energy education from 2002. It is the main objectives to teach the concept of energy conservation and renewable energy for the children learning at elementary schools, junior high schools, and high schools. In this stage, 36 universities are active as the regional base university in Japan. Moreover 11 universities are selected as the advanced regional base university. From 2004 to 2006, Iwaki Meisei University was active as the regional base university to construct the model of energy education program based on the regional cooperation. At the present, we are active as the advanced regional base university to make the wide network connecting the university, schools, industries, city, prefecture, and government. The activities in Iwaki Meisei University are consisted of four approaches, i.e., (1) experience study, (2) opening of symposium, (3) external class for students and parents, and (4) development of educational equipments.

  • Calorimeter for measuring the isobaric specific heat capacity of natural refrigerants Reviewed International journal

    K. Tanaka, Y. Higashi

    8th IIR Gustav Lorentzen Conference on Natural Working Fluids   2008.5

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  • Development of the experimental equipment of the thermoelectric conversion system with the Peltier element Reviewed

    K. Tanaka, Y. Higashi

    エネルギー環境教育研究   Vol.3 ( No.1 )   85 - 92   2008.1

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  • Measurements of the surface tension for R290, R600a and R290/R600a mixture Reviewed

    Katsuyuki Tanaka, Yukihiro Higashi

    International Journal of Refrigeration   30 ( 8 )   1368 - 1373   2007.12

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    The surface tensions of R290, R600a and R290/R600a mixture have been measured by the modified differential capillary-rise method. Twenty-two data points for R290 and 21 data points for R600a were obtained in the temperature range between 273 K and 354 K, and 43 data points for R290/R600a mixture on three isotherms of 278 K, 300 K and 320 K were obtained. The experimental uncertainties of temperature and surface tension are estimated to be within 20 mK and 0.2 mN m-1, respectively. Surface tension correlations as a function of temperature for pure R290 and R600a were formulated in the temperature range between 253 K and critical temperature, and the correlation as a function of the composition for R290/R600a mixture was discussed at 278 K, 300 K and 320 K. It is found that the surface tension for R290/R600a mixture can be reproduced by the simple mixing rule by mole fraction with the correlations of both pure components. © 2007 Elsevier Ltd and IIR.

    DOI: 10.1016/j.ijrefrig.2007.04.002

  • Vapor-liquid equilibrium measurements and correlations for the binary mixture of difluoromethane + isobutane and the ternary mixture of propane + isobutane + difluoromethane Reviewed

    Ryo Akasaka, Yukihiro Higashi, Katsuyuki Tanaka, Yohei Kayukawa, Kenichi Fujii

    Fluid Phase Equilibria   261 ( 1-2 )   286 - 291   2007.12

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    Hydrocarbons such as propane (R-290), n-butane (R-600), and isobutane (R-600a) are expected candidates for CFC, HCFC, and HFC alternative working fluids for refrigerators and heat pump systems. Hydrocarbons (HCs) are environmentally acceptable refrigerants; however, most HCs have the problem of flammability. In order to maintain the safety of home refrigerators and air-conditioners, mixing a small amount of HFCs with HCs may be effective. In our previous study, the vapor-liquid equilibrium (VLE) measurements for the binary mixtures of R-290 + R-600a and the difluoromethane (R-32) + R-290 have already been performed. This study measured the VLEs of the binary mixture of R-32 + R-600a and the ternary mixture of R-290 + R-600a + R-32. Based on the experimental data, the VLEs for three binary mixtures were correlated by using the cubic equations of state with the conventional mixing rule, and the appropriate binary interaction parameters were determined for each binary mixture. For the R-290 + R-600a and R-32 + R-290 mixtures, the correlations were successful. For the R-32 + R-600a mixture, however, because of a relatively high nonideality, the accuracy of correlation was less than that for the other two mixtures. By applying the mixing rule based on the excess Gibbs free energy model, the accuracy was well improved. Moreover, by using the binary interaction parameters for each binary mixture the prediction of the VLE for the R-290 + R-600a + R-32 mixture was tested, and predicted bubble-point pressures were compared with the experimental values. The accuracy of this prediction was at similar level to the VLE correlation for the R-32 + R-600a mixture. © 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.fluid.2007.06.029

  • 冷媒熱物性研究の最近の動向 Reviewed

    東 之弘

    冷凍   Vol.82 ( No.959 )   17 - 22   2007.9

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  • Measurements of the surface tension for R290, R600a and R290/R600a mixture Reviewed International journal

    K. Tanaka, Y. Higashi

    International Journal of Refrigeration   Vol.30 ( No.8 )   1368 - 1373   2007.8

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  • Vapor-liquid equilibrium measurements and correlations for the binary mixture of difluoromethane+isobutane and the ternary mixture of propane+isobutane+difluoromethane Reviewed International journal

    R. Akasaka, Y. Higashi, K. Tanaka, Y. Kayukawa, K. Fujii

    Fluid Phase Equilibria   Vol.261   286 - 291   2007.5

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  • Surface tension of 1,1,1,2,2,3,3,4,4-nonafluorohexane and 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether Reviewed

    Katsuyuki Tanaka, Yukihiro Higashi

    kagaku kogaku ronbunshu   33 ( 1 )   1 - 5   2007.4

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    The surface tensions of 1,1,1,2,2,3,3,4,4-nonafluorohexane (CF 3CF2CF2CF2CH2CH 3) and 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoro-ethyl ether (CHF 2CF2OCH2CF3), which are potential alternatives to HCFC solvents, were measured by the differential capillary-rise method. 20 data points for 1,1,1,2,2,3,3,4,4-nonafluorohexane and 17 data points for 1,1,2,2-tetrafluoroethyl-2,2,2,-trifluoroethyl ether were obtained in the temperature range of 289-348 K. The experimental uncertainties of temperature and surface tension measurements were estimated to be within 20 mK and 0.14 mN·m-1, respectively. Surface tension correlations for 1,1,1,2,2,3,3,4,4-nonafluorohexane and 1,1,2,2-tetrafluoroethyl-2,2,2- trifluoroethyl ether were formulated and were found to reproduce the present data within the limits of experimental uncertainty.

    DOI: 10.1252/kakoronbunshu.33.1

  • 報告記 2006年度日本冷凍空調学会年次大会

    小山 繁, 内野 敏剛, 松岡 文雄, 秋澤 淳, 児玉 昭雄, 天野 嘉春, 香川 澄, 粥川 洋平, 赤坂 亮, 市川 英彦, Yukihiro Higashi, 福田 充宏, 宮良 明男, 岡田 昌志, 松本 浩二, 渡辺 学, 下村 信雄, 廣田 真史, 井口 泰男, 山口 朝彦, 木下 盛光, 東條 健司, 西田 耕作, 五島 正雄, 勝田 正文, 桑原 憲, 本田 知宏, 森 英夫

    冷凍   82 ( 952 )   171 - 185   2007.2

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  • Surface tension for 1,1,1,2,2,3,3,4,4-Nonafluorohexane and 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether Reviewed

    K. Tanaka, Y. Higashi

    化学工学論文集   Vol.33 ( No.1 )   1 - 5   2007.1

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  • Critical parameters for 2-Methylpropane (R600a) Reviewed International journal

    Y. Higashi

    Journal of Chemical and Engineering Data   Vol.51 ( No.2 )   406 - 408   2006.4

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  • Measurements of the surface tension for the R290 + R600a mixtures Reviewed International journal

    K. Tanaka, Y. Higashi

    3rd Asian Conference on Refrigeration and Air-Conditioning   667 - 670   2006.3

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  • Critical parameters for 2-methylpropane (R600a) Reviewed

    Yukihiro Higashi

    Journal of Chemical and Engineering Data   51 ( 2 )   406 - 408   2006.3

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    Measurements of the vapor-liquid coexistence curve near the critical point for 2-methylpropane (isobutane; R600a) were carried out in the reduced temperature range of 0.957 < T/Tc < 1 and in the reduced density range of 0.40 < ρ/ρc < 1.70, and the critical temperature Tc and critical density ρc were determined. The critical pressure Pc was calculated by extrapolating reliable vapor-pressure data in the vicinity of the critical point. The critical parameters determined are Tc = (407.795 ± 0.010) K, ρc = (229 ± 2) kg·m-3, Vc = (253.8 ± 2.2) cm3·mol-1, and Pc = (3628.2 ± 1.4) kPa. In addition, the critical exponent β along the coexistence curve is discussed. © 2006 American Chemical Society.

    DOI: 10.1021/je050328d

  • Surface tension measurements of fluids under high pressures Reviewed

    Yukihiro Higashi

    Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu   15 ( 3 )   218 - 223   2005.10

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    In this paper, the simple and useful procedures of the surface tension measurement are reported. The principles and calculation methods as well as the experimental technique are also represented with respect to the typical methods, i.e., Wilhelmy method, ring method, capillary rise method, and so on. Especially, the differential capillary rise method, which is adopted by the author for the surface tension measurements under high pressures are explained in detail.

  • Composition dependence of the critical parameters for the binary mixtures of R32+R290, R32+R600a, and R290+R600a system Reviewed International journal

    Y. Higashi

    Thermophysical Properties and Transport Processes of Refrigerants   153 - 159   2005.9

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  • Surface tension measurements of fluids under high pressures Reviewed International journal

    東 之弘

    高圧力の科学と技術   Vol.15 ( No.3 )   218 - 223   2005.5

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  • Vapor-liquid equilibrium (VLB) properties for the binary systems propane (1) + re-butane (2) and propane (1) + isobutane (3) Reviewed

    Yohei Kayukawa, Kenichi Fiyii, Yukihiro Higashi

    Journal of Chemical and Engineering Data   50 ( 2 )   579 - 582   2005.3

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    PTxy data (bubble-point and dew-point pressures at a specific composition) for two binary systems, propane (1) + n-butane (2) and propane (1) + isobutane (3), are presented in this paper. These binary systems are under consideration for use as a refrigerant for a Lorentz cycle. A recirculation method along with the aid of a new composition measurement system was employed. The experimental uncertainty is 3 mK for temperature, 0.027&#37; + 1.04 kPa for pressure, and 0.11 mol &#37; for composition. A total of 60 data points were obtained in the temperature range of (270 to 310) K for propane (1) + n-butane (2) and (260 to 320) K for propane (1) + isobutane (3). Comparisons of the present data with available mixture thermodynamic models and other experimental data are discussed in this paper. © 2005 American Chemical Society.

    DOI: 10.1021/je0496701

  • Vapor-liquid equilibrium (VLE) properties for the binary systems propane (1) + n-butane (2) and propane (1) + isobutane (2) Reviewed International journal

    Y. Kayukawa, K. Fujii, Y. Higashi

    Journal of Chemical and Engineering Data   Vol.50 ( No.2 )   579 - 582   2005.2

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  • Experimental determination of the critical locus for the difluoromethane (R32) and propane (R290) system Reviewed

    Yukihiro Higashi

    Fluid Phase Equilibria   219 ( 1 )   99 - 103   2004.5

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    Vapor-liquid coexistence curves in the critical region for binary difluoromethane (R32) + propane (R290) mixtures have been measured by visual observation of the meniscus disappearance. Twelve and 15 data of saturated vapor and liquid densities for 70mass&#37; R32 and 90mass&#37; R32, respectively, have been obtained in the temperature range of 316K<T<345K and in the density range of 109kg/m3<ρ<717kg/m3. The uncertainties of the temperature, density, and composition measurements are estimated to be within 10mK, 0.3-1.1kg/m3, and 0.03&#37;, respectively. On the basis of the present results of the vapor-liquid coexistence curve, the critical temperature and the critical density for the R32 + R290 system have been determined considering the meniscus disappearance level as well as the intensity of the critical opalescence. The critical pressure of the mixtures were estimated based on the measured critical temperature and the REFPROP database. © 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.fluid.2004.02.004

  • 2成分系R32+R125混合冷媒の気液平衡性質の測定 Reviewed

    Yukihiro Higashi, 三宅 岳志, 藤井 賢一

    日本冷凍空調学会論文集   20 ( 4 )   523 - 530   2003.12

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    Vapor-Liquid Equilibrium Measurements of the Binary R32+R125 Refrigerant Mixture

  • Measurements of vapor-liquid equilibrium for the binary R32 + R125 mixture Reviewed

    Y. Higashi, T. Miyake, K. Fujii

    日本冷凍空調学会論文集   Vol.20 ( No.4 )   523 - 530   2003.10

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  • Precise measurements of the vapor-liquid equilibria(VLE) of HFC-32/134a mixtures using a new apparatus Reviewed International journal

    S. Shimawaki, K. Fujii, Y. Higashi

    International Journal of Thermophysics   Vol.23 ( No.8 )   801 - 808   2002.8

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  • Precise Measurements of the Vapor-Liquid Equilibria (VLE) of HFC-32/134a Mixtures Using a New Apparatus Reviewed

    S. Shimawaki, K. Fujii, Y. Higashi

    International Journal of Thermophysics   23 ( 3 )   801 - 808   2002.5

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    A new apparatus for precise measurements of the vapor-liquid equilibria of mixtures by the circulation method has been developed. This apparatus has two special components: a high-stability temperature control system and a helium pressurization system. The temperature in the liquid bath surrounding the sample cell is kept constant within ±0.5 mK. The helium pressurization system increases the pressure of the sampled mixture when measuring the compositions at low temperatures by gas chromatography. With these components, the uncertainty in measuring the vapor-liquid equilibria has been reduced. Using this apparatus, the vapor-liquid equilibria of HFC-32/134a mixtures were measured in a temperature range of 263.15 to 293.15 K. These results are in good agreement with the calculated results from REFPROP (Ver. 6.0.1) with a relative pressure difference of about 2&#37;.

    DOI: 10.1023/A:1015407205188

  • ハイドロフルオロカーボン(HFC)系およびその他の純粋冷媒に関する最近物性情報 Reviewed

    佐藤春樹, 高石吉登, 香川 登, 横山千昭, 東 之弘, 藤井賢一, 村上和彦, M. J. Assael, 野口真裕, 田辺博音, 福島正人, 滝川克也

    日本冷凍空調学会論文集   18   1 - 14   2001.4

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    Current Information on the Properties of Hydrofluorocarbons(HFCs) and Other Pure Refrigerants

  • Vapor-liquid critical surface of the ternary difluoromethane + pentafluoroethane + 1,1,1,2-tetrafluoroethane (R32/125/134a) mixture Reviewed International journal

    Y. Higashi

    International Journal of Thermophysics   Vol.20 ( No.5 )   1483 - 1495   1999.9

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  • Vapor-liquid equilibrium, coexistence curve, and critical locus for pentafluoroethane + 1,1,1,2-tetrafluoroethane (R125/R134a) Reviewed

    Yukihiro Higashi

    Journal of Chemical and Engineering Data   44 ( 2 )   328 - 332   1999.3

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    The vapor-liquid equilibrium for pentafluoroethane (R125) + 1,1,1,2-tetrafluoroethane (R134a) was measured along four isotherms between 283 K and 313 K. The vapor-liquid coexistence curve at constant composition near the mixture critical point was measured by the observation of the meniscus disappearance. The critical temperatures and critical densities of the 0.2670 and 0.6648 mole fraction of R125 were determined from the saturation densities along the coexistence curve in the critical region. In addition, the critical locus for the R125/R134a mixture is correlated as a function of composition.

    DOI: 10.1021/je980265h

  • Vapor-liquid equilibria for the binary difluoromethane (R-32) + propane (R-290) mixture Reviewed International journal

    Y. Higashi

    International Journal of Thermophysics   Vol.20 ( No.2 )   507 - 518   1999.3

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  • Vapor-liquid equilibrium, coexistence curve, and critical locus for pentafluoroethane + 1,1,1-trifluoroethane (R125/R143a) Reviewed

    Yukihiro Higashi

    Journal of Chemical and Engineering Data   44 ( 2 )   333 - 337   1999.3

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    The vapor-liquid equilibrium for pentafluoroethane (R125) + 1,1,1-trifluoroethane (R143a) was measured by the static method in the temperature range between 273.15 K and 313.15 K. The vapor-liquid coexistence curve near the critical point was measured by observation of the meniscus disappearance. The critical temperatures and critical densities of the 0.4118 and 0.6208 mole fraction of R125 were determined from the saturation densities along the coexistence curve in the critical region. In addition, the critical locus for the R125/R143a mixture is correlated as a function of composition.

    DOI: 10.1021/je980266+

  • Vapor-liquid equilibrium, coexistence curve, and critical locus for pentafluoroethane + 1,1,1,2-tetrafluoroethane (R125/R134a) Reviewed International journal

    Y. Higashi

    Journal of Chemical and Engineering Data   Vol.44 ( No.2 )   328 - 332   1999.2

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  • Vapor-liquid equilibrium, coexistence curve, and critical locus for pentafluoroethane + 1,1,1-trifluoroethane (R125/R143a) Reviewed International journal

    Y. Higashi

    Journal of Chemical and Engineering Data   Vol.44 ( No.2 )   333 - 337   1999.2

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  • Surface tension of HFC refrigerant mixtures Reviewed

    M. Okada, T. Shibata, Y. Sato, Y. Higashi

    International Journal of Thermophysics   20 ( 1 )   119 - 127   1999.1

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    The surface tension of several refrigerant mixtures was measured and correlated. The measurements were conducted using the differential capillary rise method (DCRM) under conditions of coexistence of the sample liquid and its saturated vapor in equilibrium. The temperature range covered was from 273 to 323 K. The resulting data were represented by a mixing rule using mass friction based on the van der Waals correlation.

    DOI: 10.1023/A:1021482231102

  • Vapor-liquid equilibria for the binary difluoromethane (R-32) + propane (R-290) mixture Reviewed

    Y. Higashi

    International Journal of Thermophysics   20 ( 2 )   507 - 518   1999.1

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    The vapor-liquid equilibrium of the mixture composed of difluoromethane (R-32) and propane (R-290) was studied in the temperature range between 273.15 and 313.15 K. The experimental uncertainties of temperature, pressure, and composition measurements were estimated to be within ± 10 mK, ± 3 kPa, and ± 0.4 mol%, respectively. Comparisons between the present data and available experimental data were made using the Helmholtz free energy mixture model (HMM) adopted in the thermophysical properties program package, REFPROP 6.0, as a baseline. In addition, the existence of an azeotrope and the determination of new adjustable parameters for HMM for the R-32 + R-290 mixture are discussed.

    DOI: 10.1023/A:1022653020420

  • Vapor-liquid critical surface of ternary difluoromethane+pentafluoroethane+1,1,1,2-tetrafluoroethane (R-32/125/134a) mixtures Reviewed

    Y. Higashi

    International Journal of Thermophysics   20 ( 5 )   1483 - 1495   1999.1

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    The plane of vapor-liquid criticality for ternary refrigerant mixtures of difluoromethane (R-32)+pentafluoroethane (R-125)+1,1,1,2-tetrafluoroethane (R-134a) was determined from data on the vapor-liquid coexistence curve near the mixture critical points. The compositions (mass percentage) of the mixtures studied were 23% R-32+25% R-125+52% R-134a (R-407C), 25% R-32+15% R-125+60% R-134a (R-407E), and 20% R-32+40% R-125+40% R-134a (R-407A). The critical temperature of each mixture was determined by observation of the disappearance of the meniscus. The critical density of each mixture was determined on the basis of meniscus disappearance level and the intensity of the critical opalescence. The uncertainties of the temperature, density, and composition measurements are estimated as ±10 mK, ±5 kg·m-3, and ±0.05%, respectively. In addition, predictive methods for the critical parameters of R-32/125/134a mixtures are discussed.

    DOI: 10.1023/A:1021445222925

  • Vapor-liquid equilibria for the binary difluoromethane (R-32) + propane (R-290) mixture Reviewed International journal

    Y. Higashi

    International Journal of Thermophysics   20 ( 2 )   507 - 518   1999.1

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    The vapor-liquid equilibrium of the mixture composed of difluoromethane (R-32) and propane (R-290) was studied in the temperature range between 273.15 and 313.15 K. The experimental uncertainties of temperature, pressure, and composition measurements were estimated to be within ± 10 mK, ± 3 kPa, and ± 0.4 mol&#37;, respectively. Comparisons between the present data and available experimental data were made using the Helmholtz free energy mixture model (HMM) adopted in the thermophysical properties program package, REFPROP 6.0, as a baseline. In addition, the existence of an azeotrope and the determination of new adjustable parameters for HMM for the R-32 + R-290 mixture are discussed.

    DOI: 10.1023/A:1022653020420

  • Apparatus for measuring the vapor pressures for natural refrigerants Reviewed

    S. Higuchi, Y. Higashi

    日本冷凍空調学会論文集   Vol.15 ( No.4 )   335 - 346   1998.10

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  • 自然冷媒の飽和蒸気圧測定装置の製作 Reviewed

    樋口 知, 東 之弘

    日本冷凍空調学会論文集   15 ( 4 )   335 - 346   1998.10

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    Apparatus of the vapor-pressure measurements for natural refrigerants

    DOI: 10.11322/tjsrae.15.335

  • Vapor-liquid equilibrium, coexistence curve and critical locus for Difluoromethane + Pentafluoroethane (R-32 + R-125) Reviewed International journal

    Y. Higashi

    Journal of Chemical and Engineering Data   Vol.42 ( No.6 )   1269 - 1273   1997.11

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  • Surface tension for 1,1,1-trifluoroethane(R-143a), 1,1,1,2-tetrafluoroethane (R-134a), 1,1- dichloro-2,2,3,3,3-pentafluorpropane(R-225ca) and 1,3- dichloro- 1,2,2,3,3 – pentafluoropropane(R-225cb) Reviewed International journal

    Y. Higashi, T. Shibata, M. Okada

    Journal of Chemical and Engineering Data   Vol.42 ( No.3 )   438 - 440   1997.3

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  • Surface tension for 1,1,1-trifluoroethane (R-143a), 1,1,1,2-tetrafluoroethane (R-134a), 1,1-dichloro-2,2,3,3,3-pentafluoropropane (R-225ca), and 1,3-dichloro-1,2,2,3,3-pentafluoropropane (R-225cb) Reviewed

    Yukihiro Higashi, Takahide Shibata, Masaaki Okada

    Journal of Chemical and Engineering Data   42 ( 3 )   438 - 440   1997.1

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    The surface tensions for 1,1,1-trifluoroethane (R-143a), 1,1,1,2-tetrafluoroethane (R-134a), 1,1-dichloro-2,2,3,3,3-pentafluoropropane (R-225ca), and 1,3-dichloro-1,2,2,3,3-pentafluoropropane (R-225cb) have been measured by the differential capillary rise method. The results were obtained in the temperature range between 273 K and 343 K. The experimental uncertainties of temperature and surface tension are estimated to be within ±20 mK and ±0.15 mN·m-1, respectively. A correlation for the surface tension as a function of temperature is presented.

    DOI: 10.1021/je960274v

  • Vapor-liquid equilibrium, coexistence curve, and critical locus for difluoromethane + pentafluoroethane (R-32 + R-125) Reviewed

    Yukihiro Higashi

    Journal of Chemical and Engineering Data   42 ( 6 )   1269 - 1273   1997.1

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    The vapor-liquid equilibrium for difluomethane + pentafluoroethane (R-32 + R-125) was measured by the static method in the temperature range between 283 K and 313 K. The vapor-liquid coexistence curve near the critical point was measured by the observation of the meniscus disappearance. The critical temperatures and critical densities of a 30 mass % R-32 and a 60 mass % R-32 mixture were determined on the basis of the saturation densities along the coexistence curve in the critical region. In addition, the critical locus for the R-32 + R-125 mixture is correlated as the function of composition.

    DOI: 10.1021/je9701083

  • Thermodynamic tables, Ph and Ts diagram for SI unit – R-22, R-134a and NH3 Reviewed

    K. Oguchi, Y. Takaishi, Y. Higashi, N. Yada, T. Namiki

    冷凍   Vol.71 ( No.826 )   826 - 847   1996.10

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  • Critical parameters for 1,1,1-trifluoroethane (R-143a) Reviewed

    Yukihiro Higashi, Takeaki Ikeda

    Fluid Phase Equilibria   125 ( 1-2 )   139 - 147   1996.10

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    Measurements of the vapor-liquid coexistence curve near the critical point were carried out for 1,1,1-trifluoroethane (R-143a) in the reduced temperature range of 0.97 < T/Tc < 1 and in the reduced density range of 0.45 < ρ/ρc < 1.53. Taking into consideration of the disappearing level of the meniscus as well as the intensity of the critical opalescence, the critical temperature Tc and critical density ρc were determined. With respect to the critical pressure Pc, we calculated the value from the new vapor-pressure equation made by ourselves in order to represent the behavior of vapor-pressures near the critical point. The critical parameters determined in this paper are Tc = 345.88 + δT K, δT = 0.00±0.01 K, ρc = 431 ± 3 kg m-3, and Pc = 3764 + 78.73δT ± 5 kPa. In addition, the critical exponent β along the coexistence curve was also discussed.

    DOI: 10.1016/s0378-3812(96)03089-0

  • Critical parameters for 1,1,1-trifluoroethane (R-143a) Reviewed International journal

    Y. Higashi, T. Ikeda

    Fluid Phase Equilibria   Vol.125   139 - 147   1996.7

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  • Vapor-liquid equilibrium, coexistence curve and critical locus for Binary HFC-32/HFC-134a mixture Reviewed International journal

    Y. Higashi

    International Journal of Thermophysics   Vol.16 ( No.5 )   1175 - 1184   1995.9

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  • Vapor-liquid equilibrium, coexistence curve, and critical locus for binary HFC-32/HFC-134a mixture Reviewed

    Y. Higashi

    International Journal of Thermophysics   16 ( 5 )   1175 - 1184   1995.9

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    Two kinds of equilibrium measurements of binary R-32/134a mixtures were carried out. The vapor-liquid equilibria were measured by the static method in the temperature range between 283 and 313 K. On the basis of the present experimental data, the temperature dependence of the binary interaction parameter k12 for two equations of state, namely, the Soave-Redlich-Kwong equation and Carnahan-Starling-De Santis equation, was discussed. The vapor-liquid coexistence curve near the critical point was also measured by the observation of meniscus disappearance. The critical temperatures and critical densities of 30 and 70 wt&#37; R-32 mixtures were determined on the basis of the saturation densities along the coexistence curve in the critical region. In addition, a correlation of the critical locus for this mixture is proposed as a function of composition. © 1995 Plenum Publishing Corporation.

    DOI: 10.1007/BF02081285

  • Experimental surface tension for HFC-32, HCFC-124, HFC-125, HCFC-141b and HFC-152a Reviewed International journal

    M. Okada, Y. Higashi

    International Journal of Thermophysics   Vol.16 ( No.3 )   791 - 800   1995.5

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  • Experimental surface tensions for HFC-32, HCFC-124, HFC-125, HCFC-141b, HCFC-142b, and HFC-152a Reviewed

    M. Okada, Y. Higashi

    International Journal of Thermophysics   16 ( 3 )   791 - 800   1995.5

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    The surface tension of six alternative refrigerants, i.e., HFC-32 (CH, F, ). HCFC-124 (CHClFCF,), HFC-125 (CHF2CF3). HCFC-14lb ICH,CCI,F). HCFC-142b (CH3CCIF2), and HFC-152a (CH3CHF2), has been measured in the present study. The measurements were conducted under equilibrium conditions between the liquid and its saturated vapor. The differential capillary-rise method (DORM) used two glass capillaries, with inner radii of 0.3034 ± 0.0002 and 0.5717 ±0.0002 mm, respectively. Temperatures in the range from 270 to 340 K were considered. The accuracy of surface tension measurements is estimated to be within ±0.2 mN · m-1. The temperatures are accurate to within ±20 mK. The temperature dependence of the resultant data were successfully represented by van der Waals' correlations to within ±(1.1 mN m-1 for each substance. Available surface tension data are compared with the present data. © 1995 Plenum Publishing Corporation.

    DOI: 10.1007/BF01438864

  • Measurements of the surface tension of fluids under high pressures Invited Reviewed International journal

    M. Okada, Y. Higashi

    高圧力の科学と技術   Vol.3 ( No.4 )   324 - 331   1994.10

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  • Critical parameters for HFC134a, HFC32 and HFC125 Reviewed International journal

    Y. Higashi

    International Journal of Refrigeration   Vol.17 ( No.8 )   524 - 531   1994.8

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  • Surface Tension Measurements of Fluids under High Pressure Reviewed

    Masaaki Okada, Yukihiro Higashi

    The Review of High Pressure Science and Technology   3 ( 4 )   324 - 331   1994.1

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    Surface tension measurements of fluids under high pressure is described here. A topic focused on is the fluorocarbon refrigerants and alternative refrigerants, since the authors have much experience for these fluids. The principle and the experimental apparatus of capillary rise method is briefly explained, since this method is widely utilized to measure the surface tension under high pressure. This article introduces the summary of the experimental results and correlations for surface tension of HCFCs and HFCs which are the candidate fluids for alternative refrigerants.

    DOI: 10.4131/jshpreview.3.324

  • Critical parameters for HFC134a, HFC32 and HFC125 Reviewed

    Y. Higashi

    International Journal of Refrigeration   17 ( 8 )   524 - 531   1994

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    The vapour-liquid coexistence curves near the critical point for HFC134a (CF3CH2F: 1,1,1,2-tetrafluoroethane), HFC32 (CH2F2: difluoromethane) and HFC125 (CHF2CF3: pentafluoroethane) have been measured by visual observation of the meniscus disappearance. Three sets of 17 experimental results for the saturated liquid or vapour densities for HFC134a, HFC32 and HFC125 have been obtained in the reduced temperature range T/Tc > 0.96 and in the reduced density range 0.4 < ρ/ρc < 1.7. From these measurements, the critical temperature and the critical density for these HFCs have been determined in consideration of the meniscus disappearance level as well as the intensity of the critical opalescence. The critical pressure has been calculated by the extrapolation of the vapour-pressure correlation. The uncertainties of the critical temperature, critical density and critical pressure are estimated to be within ± 10 mK, ± 5 kg m-3 and ± 9 kPa, respectively.

    DOI: 10.1016/0140-7007(94)90028-0

  • Measurements of the surface tension for alternative refrigerants (1st report: Experimental apparatus and confirmation of the experiment by CFC-12, HCFC-22 and CFC-113) Reviewed

    Y. Higashi, M. Okada

    日本冷凍協会論文集   第9巻 ( 2号 )   181 - 190   1992.7

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  • Measurements of the surface tension for alternative refrigerants (2nd report: Surface tension for HCFC-123 and HFC-134a) Reviewed

    Y.Higashi, T. Ikeda, T. Kuwana, M. Okada

    日本冷凍協会論文集   第9巻 ( 2号 )   191 - 198   1992.7

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  • 代替フロン類の表面張力の測定:第2報 HCFC-123およびHFC-134aの表面張力 Reviewed

    Yukihiro Higashi, 池田 忠光, 桑名 健朗, 岡田 昌章

    日本冷凍空調学会論文集   9 ( 2 )   191 - 198   1992

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    Measurements of the surface tension for two kinds of CFC alternatives, i.e., HCFC-123 (2,2-dichloro-1,1,1-trifluoroethane), and HFC-134a (1,1,1,2-tetrafluoroethane), have been made by the differential capillary rise method (DCRM) and the vertical plate method (VPM). For HCFC-123, 15 data have been obtained by DCRM in the temperature range between 273 and 333 K within the uncertainty of ±0.1mN/m, and 21 data have been obtained by VPM in the temperature range between 273 and 290 K within the uncertainty of ±0.2mN/m. For HFC-134a, 17 data have been obtained by DCRM in the temperature range between 276 and 329 K within the uncertainty of ±0.1mN/m. The uncertainty of temperature measurement by DCRM is estimated within ±20mK, whereas that by VPM within ±30mK. New correlations of the surface tension for HCFC-123 and HFC-134a have been also proposed.

    DOI: 10.11322/tjsrae.9.191

  • Apparatus for measurements of PVT properties and their derivatives for fluids and fluid mixtures with a metal bellows as a variable-volume vessel Reviewed

    T. Kamimura, A. Iso, Y. Higashi, M. Uematsu, K. Watanabe

    Review of Scientific Instruments   60 ( 9 )   3055 - 3061   1989.12

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    A new apparatus for measurements of PVT properties and their derivatives with a metal bellows was designed for fluids and fluid mixtures of a fixed composition for pressures up to 20 MPa in the range of temperatures from room-temperature condition to 473 K. The apparatus, procedures, and results of calibrations are described. The capabilities of the apparatus are illustrated by means of the vapor-pressure measurements for chlorodifluoromethane and the PVT measurements of sulfur hexafluoride. Temperatures were set and kept constant at the values desired within ±3 mK and pressures within ±2 kPa. It was shown that density derivatives with respect to pressure at constant temperature and those with respect to temperature at constant pressure may both obtain from the experimental results.

    DOI: 10.1063/1.1141059

  • Apparatus for measurements of PVT properties and their derivatives for fluids and fluid mixtures with a metal bellows as a variable-volume vessel Invited Reviewed International journal

    T. Kamimura, A. Iso, Y. Higashi, M. Uematsu, K. Watanabe

    Review of Scientific Instruments   Vol.60 ( No.9 )   3055 - 3061   1989.9

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  • Predictive method of thermodynamic properties for halogenated hydrocarbons Reviewed

    Y. Higashi

    日本冷凍協会論文集   第6巻 ( 2号 )   1 - 11   1989.7

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  • Measurements of the Vapor-Liquid Coexistence Curve for the R 13B1 + R 114 System in the Critical Region Reviewed

    Y. Higashi, Y. Kabata, M. Uematsu, K. Watanabe

    Journal of Chemical and Engineering Data   33 ( 1 )   23 - 26   1988.9

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    Measurements of the vapor-liquid coexistence curve in the critical region for the refrigerant mixture of bromotrHIuoromethane (CBrF3, R 13B1) and 1,2-dlchloro-1,1,2,2-tetrafluoroethane (CCIF2CCIF2, R 114) were made by visual observation of the disappearance of the meniscus at the vapor-liquid Interface within an optical cell. Eighteen saturated-vapor densities and 21 saturated-liquid densities for four different compositions of 25, 50, 70, and 80 wt &#37; R 13B1 between 345 and 406 K were obtained in the range of densities 356-1166 kg/m3. The experimental error of temperature, density, and mass fraction was estimated within ±15 mK, ±0.5&#37;, and ±0.05&#37;, respectively. On the basis of these measurements, the critical curve of the R 13B1 + R 114 system is determined and compared with several predictive methods. In addition, new correlation so as to represent the composition dependence of the critical parameters for the R 13B1 + R 114 system is proposed. © 1988, American Chemical Society. All rights reserved.

    DOI: 10.1021/je00051a009

  • CORRELATION OF THE CRITICAL CURVE FOR BINARY REFRIGERANT MIXTURES

    Y HIGASHI, M UEMATSU, K WATANABE

    JSME INTERNATIONAL JOURNAL SERIES II-FLUIDS ENGINEERING HEAT TRANSFER POWER COMBUSTION THERMOPHYSICAL PROPERTIES   31 ( 3 )   573 - 580   1988.8

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    DOI: 10.1299/jsmeb1988.31.3_573

  • A PROPOSAL FOR A GENERALIZED CORRELATION OF VAPOR-PRESSURES OF REFRIGERANTS Reviewed

    M ASHIZAWA, Y HIGASHI, M UEMATSU, K WATANABE

    JSME INTERNATIONAL JOURNAL SERIES II-FLUIDS ENGINEERING HEAT TRANSFER POWER COMBUSTION THERMOPHYSICAL PROPERTIES   31 ( 3 )   565 - 572   1988.8

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  • Measurements of the vapor-liquid coexistence curve for the R13B1 + R114 system in the critical region Reviewed International journal

    Y. Higashi, Y. Kabata, M. Uematsu, K. Watanabe

    Journal of Chemical and Engineering Data   Vol.33 ( No.1 )   23 - 26   1988.1

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    Journal of Chemical and Engineering Data

  • Study of the coexistence curve and critical locus for nonazeotropic refrigerant mixtures of R152a + R114 system Reviewed

    Y. Kabata, Y. Higashi, M. Uematsu, K. Watanabe

    日本冷凍協会論文集   第5巻 ( 1号 )   97 - 106   1988.1

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  • A proposal for generalized correlation of vapor pressures of refrigerants Reviewed

    Yukihiro Higashi, Masami Ashizawa, Masahiko Uematsu, Koichi Watanabe

    JSME International Journal   31 ( 3 )   565 - 572   1988

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  • Correlation of the critical curve for binary refrigerant mixtures Reviewed

    Yukihiro Higashi, Masahiko Uematsu, Koichi Watanabe

    JSME International Journal   31 ( 3 )   573 - 580   1988

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  • Measurements of vapor pressure, vapor-liquid coexistence curve and critical parameters of Refrigerant 152a Reviewed

    Y. Higashi, M. Ashizawa, Y. Kabata, T. Majima, M. Uematsu, K. Watanabe

    日本機械学会論文集, B編   第53巻 ( 488号 )   1379 - 1385   1987.5

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  • MEASUREMENT OF VAPOR PRESSURE, VAPOR-LIQUID COEXISTENCE CURVE AND CRITICAL PARAMETERS OF REFRIGERANT 152a.

    Yukihiro Higashi, Masami Ashizawa, Yasuo Kabata, Toshiaki Majima, Masahiko Uematsu, Koichi Watanabe

    JSME International Journal   30   1106 - 1112   1987.1

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    MEASUREMENT OF VAPOR PRESSURE, VAPOR-LIQUID COEXISTENCE CURVE AND CRITICAL PARAMETERS OF REFRIGERANT 152a.
    Forty-four vapor pressures of Refrigerant 152a (CH//3CHF//2: 1,1-difluoroethane) between 273 K and 386 K have been measured in the range of pressures from 0. 26 MPa to 4. 48 MPa. Ten saturated liquid densities and eleven saturated vapor densities near the critical point have also been measured in the range of temperatures from 370 K to the critical temperature which corresponds to a density variation of 153 kg multiplied by (times) m** minus **3 to 635 kg multiplied by (times) m** minus **3. The experimental uncertainties of temperature, pressure and density measurements have been estimated within 10 mK, 0. 8 kPa and 0. 55&#37;, respectively. On the basis of these results, the critical temperature, critical pressure and critical density of R 152a have been determined to be 386. 44 K, 4. 519 8 MPa and 368 kg multiplied by (times) m** minus 3, respectively, in consideration of the meniscus disappearing level as well as the intensity of the critical opalescence.

    DOI: 10.1299/jsme1987.30.1106

  • Measurements of vapor pressure, vapor-liquid coexistence curve and critical parameters of refrigerant 152a Reviewed

    Yukihiro Higashi, Masami Ashizawa, Yasuo Kabata, Toshiaki Majima, Masahiko Uematsu, Koichi Watanabe

    Transactions of the Japan Society of Mechanical Engineers Series B   53 ( 488 )   1379 - 1385   1987.1

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    Forty-four vapor pressures of Refrigerant 152 a (CH3 CHF2 : 1, 1-difluoroethane) between 273 and 386 K were measured in the range of pressures from 0.26 to 4.48 MPa. Ten saturated liquid densities and eleven saturated vapor densities near the critical point were also measured in the range of temperatures from 370 K to the critical temperature which corresponds to a density variation of 153 to 635 kg·m-3. The experimental uncertainties of temperature, pressure and density measurements were estimated within ±10 mK, ±0.8 kPa and ±0. 55 %, respectively. On the basis of these results, the critical temperature, critical pressure and critical density of R 152 a were determined to be 386.44 K, 4.5198 MPa and 368 kg·m-3, respectively, in consideration of the meniscus disappearing level as well as the intensity of the critical opalescence. In addition, the correlation of vapor pressure and that of the vapor-liquid coexistence curve were also proposed.

    DOI: 10.1299/kikaib.53.1379

  • MEASUREMENT OF VAPOR PRESSURE, VAPOR-LIQUID COEXISTENCE CURVE AND CRITICAL PARAMETERS OF REFRIGERANT 152a. Reviewed

    Yukihiro Higashi, Masami Ashizawa, Yasuo Kabata, Toshiaki Majima, Masahiko Uematsu, Koichi Watanabe

    JSME international journal   30 ( 265 )   1106 - 1112   1987.1

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    Forty-four vapor pressures of Refrigerant 152a (CH//3CHF//2: 1,1-difluoroethane) between 273 K and 386 K have been measured in the range of pressures from 0. 26 MPa to 4. 48 MPa. Ten saturated liquid densities and eleven saturated vapor densities near the critical point have also been measured in the range of temperatures from 370 K to the critical temperature which corresponds to a density variation of 153 kg multiplied by (times) m** minus **3 to 635 kg multiplied by (times) m** minus **3. The experimental uncertainties of temperature, pressure and density measurements have been estimated within 10 mK, 0. 8 kPa and 0. 55%, respectively. On the basis of these results, the critical temperature, critical pressure and critical density of R 152a have been determined to be 386. 44 K, 4. 519 8 MPa and 368 kg multiplied by (times) m** minus 3, respectively, in consideration of the meniscus disappearing level as well as the intensity of the critical opalescence.

    DOI: 10.1299/jsme1987.30.1106

  • Measurements of the vapor-liquid coexistence curve and the critical locus for several refrigerant mixtures Reviewed

    Y. Higashi, M. Uematsu, K. Watanabe

    International Journal of Thermophysics   7 ( 1 )   29 - 40   1986.1

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    Measurements of the vapor-liquid coexistence curve in the critical region for the systems of binary refrigerant mixture, i.e., Refrigerant 22 + Refrigerant 114 and Refrigerant 13B1 + Refrigerant 114, have been made by visual observation of the meniscus at the vapor-liquid interface within an optical cell. The experimental uncertainty of the temperature, density, and mass fraction is estimated within 15 mK, 0.5&#37;, and 0.05&#37;, respectively. The critical locus for these mixtures has been determined taking into consideration the disappearing meniscus level and the intensity of the critical opalescence. In accordance with the previous results of the Refrigerant 12 + Refrigerant 22 system, the coexistence curve for binary refrigerant mixtures is discussed. The composition dependence of the critical parameters for refrigerant mixtures is also discussed and compared with that of several predictive methods. © 1986 Plenum Publishing Corporation.

    DOI: 10.1007/BF00503796

  • Measurements of the vapor-liquid coexistence curve and the critical locus for several refrigerant mixtures Reviewed

    Y. Higashi, M. Uematsu, K. Watanabe

    International Journal of Thermophysics   7 ( 1 )   29 - 40   1986.1

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    Measurements of the vapor-liquid coexistence curve in the critical region for the systems of binary refrigerant mixture, i.e., Refrigerant 22 + Refrigerant 114 and Refrigerant 13B1 + Refrigerant 114, have been made by visual observation of the meniscus at the vapor-liquid interface within an optical cell. The experimental uncertainty of the temperature, density, and mass fraction is estimated within 15 mK, 0.5%, and 0.05%, respectively. The critical locus for these mixtures has been determined taking into consideration the disappearing meniscus level and the intensity of the critical opalescence. In accordance with the previous results of the Refrigerant 12 + Refrigerant 22 system, the coexistence curve for binary refrigerant mixtures is discussed. The composition dependence of the critical parameters for refrigerant mixtures is also discussed and compared with that of several predictive methods.

    DOI: 10.1007/BF00503796

  • THERMOPHYSICAL PROPERTIES OF NONAZEOTROPIC REFRIGERANT BLENDS. Reviewed

    Koichi Watanabe, Yukihiro Higashi

    Unknown Journal   1986

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    This paper presents an overview of the thermophysical properties of nonazeotropic refrigerant blends (NARBs) which have been considered prospective especially for the advanced vapor-compression heat pump systems. After introducing some general backgrounds on the thermodynamic behaviors of NARBs, the current state of the art for the thermophysical properties research on NARBs is reviewed. The emphasis, however, is given not only to the systematic studies of thermodynamic properties of NARBs by the group of the present authors at Keio University, Yokohama, but also to the experimental results of non-equilibrium properties recently published in Japan. The paper concludes the importance of thermophysical properties research on refrigerant mixtures under the extended ranges of parameters so as to provide more accurate and concrete criteria to the selection of the optimum blend for various industrial applications.

  • Measurements of the vapor-liquid coexistence curve and determination of the critical parameters for Refrigerant R 114 Reviewed International journal

    Y. Higashi, M. Uematsu, K. Watanabe

    Bulletin of the JSME   Vol.28 ( No.246 )   2968 - 2973   1985.11

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  • Measurements of the vapor-liquid coexistence curve and determination of the critical parameters for Refrigerant R 13B1 Reviewed International journal

    Y. Higashi, M. Uematsu, K. Watanabe

    Bulletin of the JSME   Vol.28 ( No.245 )   2660 - 2666   1985.9

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  • Measurements of the vapor-liquid coexistence curve and determination of the critical parameters for Refrigerant R 114 Reviewed

    Y. Higashi, M. Uematsu, K. Watanabe

    日本機械学会論文集, B編   第51巻 ( 464号 )   1327 - 1333   1985.5

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  • Measurements of the vapor-liquid coexistence curve and determination of the critical parameters for Refrigerant R 13B1 Reviewed

    Y. Higashi, M. Uematsu, K. Watanabe

    日本機械学会論文集, B編   第51巻 ( 463号 )   892 - 899   1985.3

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  • MEASUREMENTS OF THE VAPOR-LIQUID COEXISTENCE CURVE AND DETERMINATION OF THE CRITICAL PARAMETERS FOR REFRIGERANT 114. Reviewed

    Yukihiro Higashi, Masahiko Uematsu, Koichi Watanbe

    Bulletin of the JSME   28 ( 246 )   2968 - 2973   1985.1

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    Measurements of the vapor-liquid coexistence curve in the critical region for Refrigerant 114 (C//2Cl//2F//4) were made by visual observation of the disppearance of a meniscus at the vapor-liquid interface within an optical cell. Twenty-three saturated densities between 410 K and the critical temperature were obtained in the density range 290 to 894 kg/m**3. The experimental uncertainties of temperature and density were estimated within plus or minus 15 mK and plus or minus 0. 5 %, respectively. On the basis of these results, the critical temperature ** TAU //c and the critical density ** rho //c for R 114 were determined to be 418. 78 K and 576 kg/m**3, respectively, in consideration of the disappearing meniscus level as well as the intensity of the critical opalescence.

    DOI: 10.1299/jsme1958.28.2968

  • Measurements of the Vapor-Liquid Coexistence Curve and Determination of the Critical Parameters for R 114 Reviewed

    Yukihiro Higashi, Masahiko Uematsu, Koichi Watanabe

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   51 ( 464 )   1327 - 1333   1985.1

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    The measurements of the vapor-liquid coexistence curve in the critical region for R 114 (C2Cl2F4) were made by visual observation of the disappearance of the meniscus at the vapor-liquid interface within an optical cell. Twenty-three saturated densities between 410 K and critical temperature were obtained in the range of densities 290 to 894 kg/m3. The experimental errors of temperature and density were estimated within ±15mK and ±0.5%, respectively. On the basis of these results, the critical temperature Tc and the critical density ρc for R 114 were determined to be 418.78 K and 576 kg/m3, respectively, in consideration of the disappearing meniscus level as well as the intensity of the critical opalescence. The critical pressure Pc for R 114 was calculated to be 3.252 MPa by the available vapor-pressure correlation with the present value of Tc. In addition, the critical exponent β and the law of rectilinear diameter near the critical point were also discussed.

    DOI: 10.1299/kikaib.51.1327

  • MEASUREMENTS OF THE VAPOR-LIQUID COEXISTENCE CURVE AND DETERMINATION OF THE CRITICAL PARAMETERS FOR REFRIGERANT 13B1. Reviewed

    Yukihiro Higashi, Masahiko Uematsu, Koichi Watanabe

    Bulletin of the JSME   28 ( 245 )   2660 - 2666   1985.1

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    Measurements of the vapor-liquid coexistence curve in the critical region for Refrigerant 13B1 (CBrF//3) were made by visual observation of the disappearance of the meniscus at the vapor-liquid interface within an optical cell. Twenty-two saturated densities for temperatures between 332 and 340 K were obtained in the range of densities 376 to 1108 kg/m**3. Based upon the results along the coexistence curve, the critical temperature T//c, the critical density P//c and the critical pressure P//c for R 13B1 were determined to be 340. 08 K, 764 kg/m**3 and 3. 956 MPa, respectively, in consideration of the disappearing meniscus level as well as the intensity of the critical opalescence. In addition, the critical exponent beta was determined to be 0. 340 and the correlation of the vapor-liquid coexistence curve for R 13B1 was established.

    DOI: 10.1299/jsme1958.28.2660

  • Determination of the vapor-liquid coexistence curve and the critical parameters for refrigerant 502 Reviewed

    Y. Higashi, M. Uematsu, K. Watanabe

    International Journal of Thermophysics   5 ( 2 )   117 - 129   1984.6

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    The vapor-liquid coexistence curve for refrigerant 502 (R 502) near the critical point has been determined by visual observation of the disappearance of the meniscus. Twenty-six saturated densities between 262 and 899 kg· m-3 have been obtained within an experimental error in temperature and density of ± 10 mK and ± 0.5&#37;, respectively. Using these results along the vapor-liquid coexistence curve, the critical parameters, i.e., the critical temperature Tc=355.37 ±0.01 K and the critical density ρc=555±3kg · m-3, have been determined based on the disappearance of the meniscus level as well as on the intensity of the critical opalescence. A critical pressure Pc=4.070±0.002 MPa has been calculated from the existing vapor-pressure correlation using the present Tcvalue. In addition, the critical exponent β along the coexistence curve and the law of rectilinear diameter near the critical point are discussed. © 1984 Plenum Publishing Corporation.

    DOI: 10.1007/BF00505495

  • Determination of the vapor-liquid coexistence curve and the critical parameters for refrigerant 502 Reviewed

    Y. Higashi, M. Uematsu, K. Watanabe

    International Journal of Thermophysics   5 ( 2 )   117 - 129   1984.6

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    The vapor-liquid coexistence curve for refrigerant 502 (R 502) near the critical point has been determined by visual observation of the disappearance of the meniscus. Twenty-six saturated densities between 262 and 899 kg· m-3 have been obtained within an experimental error in temperature and density of ± 10 mK and ± 0.5%, respectively. Using these results along the vapor-liquid coexistence curve, the critical parameters, i.e., the critical temperature Tc=355.37 ±0.01 K and the critical density ρc=555±3kg · m-3, have been determined based on the disappearance of the meniscus level as well as on the intensity of the critical opalescence. A critical pressure Pc=4.070±0.002 MPa has been calculated from the existing vapor-pressure correlation using the present Tcvalue. In addition, the critical exponent β along the coexistence curve and the law of rectilinear diameter near the critical point are discussed.

    DOI: 10.1007/BF00505495

  • Measurements of the Vapor-Liquid Coexistence Curve for the Binary R12 + R22 System in the Critical Region Reviewed

    Yuklhlro Higashi, Shlro Okazaki, Yoshinori Takalshl, Masahlko Uematsu, Kolchl Watanabe

    Journal of Chemical and Engineering Data   29 ( 1 )   31 - 36   1984.4

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    Measurements of the vapor-liquid coexistence curve In the critical region for the binary dichlorodlfluoromethane (CCI2F2, R12) + chlorodlfluoromethane (CHCIF2, R22) system were made by visual observation of the disappearance of the meniscus at the vapor-liquid Interface within an optical cell. Fifty-one saturated-vapor densities and thirty-seven saturated-liquid densities for seven different compositions of 0, 10, 20, 30, 50, 75, and 100 wt &#37; R22 between 355 and 385 K (T, > 0.98) were obtained In the range of densities 280-892 kg/m3 (0.5 < p, < 1.5). The experimental error of temperature, density, and mass fraction was estimated within ±10 mK, ±0.5&#37; and ±0.05 &#37;, respectively. The composition dependence of the critical parameters Is analyzed and discussed on the basis of these measurements. © 1984, American Chemical Society. All rights reserved.

    DOI: 10.1021/je00035a012

  • Measurements of the Vapor-Liquid Coexistence Curve for the Binary R12 + R22 System in the Critical Region Reviewed

    Yuklhlro Higashi, Shlro Okazaki, Yoshinori Takalshl, Masahlko Uematsu, Kolchl Watanabe

    Journal of Chemical and Engineering Data   29 ( 1 )   31 - 36   1984.4

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    Measurements of the vapor-liquid coexistence curve In the critical region for the binary dichlorodlfluoromethane (CCI2F2, R12) + chlorodlfluoromethane (CHCIF2, R22) system were made by visual observation of the disappearance of the meniscus at the vapor-liquid Interface within an optical cell. Fifty-one saturated-vapor densities and thirty-seven saturated-liquid densities for seven different compositions of 0, 10, 20, 30, 50, 75, and 100 wt % R22 between 355 and 385 K (T, > 0.98) were obtained In the range of densities 280-892 kg/m3 (0.5 < p, < 1.5). The experimental error of temperature, density, and mass fraction was estimated within ±10 mK, ±0.5% and ±0.05 %, respectively. The composition dependence of the critical parameters Is analyzed and discussed on the basis of these measurements.

    DOI: 10.1021/je00035a012

  • Procedures for determining the critical parameters of fluids Reviewed

    S. Okazaki, Yukihiro Higashi, Y. Takaishi, M. Uematsu, K. Watanabe

    Review of Scientific Instruments   54 ( 1 )   21 - 25   1983.12

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    An apparatus and procedures to determine the critical parameters and the vapor-liquid coexistence curve in the critical region by observing the disappearance of the vapor-liquid interface are described. The apparatus has the advantage of measuring the saturated vapor and liquid densities with only a single filling of the sample, and the procedures are applicable not only to pure fluids but also to mixtures. Three densities of liquid and eight of vapor on the coexistence curve for trifluoromethane are obtained, and the critical temperature, density, and pressure are also determined.

    DOI: 10.1063/1.1137208

  • Procedures for determining the critical parameters of fluids Reviewed International journal

    S. Okazaki, Y. Higashi, Y. Takaishi, M. Uematsu, K. Watanabe

    Review of Scientific Instruments   Vol.54 ( No.1 )   21 - 25   1983.1

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  • ハイドロフルオロカーボン(HFC)系およびその他の純粋冷媒に関する最新物性情報 Reviewed

    佐藤春樹, 高石吉登, 香川澄, 横山千昭, 東 之弘, 藤井賢一, 村上和彦, M. J.Assael, 野口真裕, 田辺博音, 福島正人, 瀧川克也

    日本冷凍空調学会論文集 2001   Vol.18 ( No.3 )   203 - 216   1900

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Books

  • JSRAE Thermodynamic Tables, Vol.4 – JARef HFO-1234ze(E)-

    R. AKASAKA, Y. KAYUKAWA, K. TANAKA, Y. HIGASHI

    Japan Society of Refrigerating and Air Conditioning Engineers (JSRAE)  2011.12 

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  • JSRAE Thermodynamic Tables, Vol.3 – JARef HFO-1234yf-

    R. AKASAKA, Y. KAYUKAWA, K. TANAKA, Y. HIGASHI

    Japan Society of Refrigerating and Air Conditioning Engineers (JSRAE)  2010.12 

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  • 冷凍空調便覧基礎編(分担執筆)

    東 之弘

    日本冷凍空調学会  2010.2 

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  • 新編熱物性ハンドブック(分担執筆)

    東 之弘

    日本熱物性学会編集,養賢堂  2008.10 

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  • JSRAE Thermodynamic Tables, Vol.2 – JARef R410A -(分担執筆)

    Y. Higashi

    Japan Society of Refrigerating and Air Conditioning Engineers (JSRAE)  2008.10 

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  • 冷凍空調手帳(分担執筆)

    東 之弘

    日本冷凍空調学会  2008.3 

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    Language:Japanese  

  • 物理データ事典(分担執筆)

    東 之弘

    朝倉書店  2006.4 

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  • JSRAE Thermodynamic Tables, Vol.1 – JARef HFCs and HCFCs(Ver.2) -

    N. Kagawa, Y. Higashi, M. Okada, Y. Kayukawa

    Japan Society of Refrigerating and Air Conditioning Engineers (JSRAE)  2004.5 

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  • 工業熱力学入門

    東 之弘

    日新出版  2001.7 

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  • 機械工学辞典(分担執筆)

    東 之弘

    日本機械学会  1998.9 

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  • R123: Thermodynamic and Physical Properties(分担執筆)

    Y. Higashi

    International Institute of Refrigeration  1995.10 

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  • R134a: Thermodynamic and Physical Properties(分担執筆)

    Y. Higashi

    International Institute of Refrigeration  1995.10 

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  • JAR Thermodynamic Tables, Vol.1 – JARef HFCs and HCFCs (Ver.1)- (分担執筆)

    H. Sato, Y. Higashi, M. Okada, Y. Takaishi, N. Kagawa, M. Fukushima

    日本冷凍協会  1994.3 

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  • 冷凍空調便覧(第5版,分担執筆)

    東 之弘

    日本冷凍協会編集  1993.1 

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  • 工業熱力学入門(第2版)

    東 之弘, 猪飼 茂

    明星大学出版部  1992.11 

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  • 代替フロン類の熱物性(分担執筆)

    東 之弘(Role:Joint author)

    1991.5 

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  • 熱物性ハンドブック(初版, 分担執筆)

    東 之弘(Role:Joint author)

    養賢堂  1990.10 

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Presentations

  • 低GWP作動流体の三重点測定

    不動 勇心, 中村 琢夢, 岩崎 俊, 近藤 智恵子, 東 之弘

    第40回日本熱物性シンポジウム  2019.10 

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    Event date: 2019.10

    Language:Japanese  

    Venue:長崎県長崎市   Country:Japan  

  • 次世代冷媒R1233zd(E)の蒸気圧の測定

    迫田 直也, 東 之弘

    第40回日本熱物性シンポジウム  2019.10 

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    Event date: 2019.10

    Language:Japanese  

    Venue:長崎県長崎市   Country:Japan  

  • Thermodynamic Properties Measurements of HFE356mmz for High-temperature Heat Pump Systems International conference

    M. Nagaoka, K. Yosiura, N. Sakoda, Y. Higashi, Y. Takata

    The Asian Thermophysical Properties Conference in 2019 (ATPC 2019)  2019.10 

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    Event date: 2019.10

    Language:English  

    Venue:Xi'an   Country:China  

    Other Link: http://www.atpc2019.org/

  • PVT Properties, Saturated Densities and Critical Parameters for a Low-GWP Refrigerant Mixture R448a International conference

    N. Sakoda, Y. Higashi

    The Asian Thermophysical Properties Conference in 2019 (ATPC 2019)  2019.10 

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    Event date: 2019.10

    Language:English  

    Venue:Xi'an   Country:China  

    Other Link: http://www.atpc2019.org/

  • Thermodynamic-Property Modeling of HFO-1234ze(E) + HFC-32 Mixtures for Evaluating Cycle Performance International conference

    K. Tanaka, Y. Higashi, R. Akasaka

    23rd International Congress of Refrigeration  2011.10 

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    Event date: 2019.10 - 2011.10

    Language:English  

    Venue:Prague   Country:Czech Republic  

  • R32/R1234yf/R744 三成分混合冷媒を用いた蒸気圧縮式ヒートポンプシステムのエクセルギー解析

    Thu Kyaw, 竹里 光世, 仙波 昇, Perera U.C.A., 高田 信夫, 宮崎 隆彦, 東 之弘

    2019年度日本冷凍空調学会年次大会  2019.9 

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    Event date: 2019.9

    Language:Japanese  

    Venue:東京都江東区   Country:Japan  

  • HFO1336mzz(Z)およびHFO1336mzz(E)の飽和蒸気圧測定

    迫田 直也, 東 之弘

    2019年度日本冷凍空調学会年次大会  2019.9 

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    Event date: 2019.9

    Language:Japanese  

    Venue:東京都江東区   Country:Japan  

  • HFO系低GWP純冷媒の表面張力測定結果と相関式の評価

    岩崎 俊, 近藤 智恵子, 東 之弘

    2019年度日本冷凍空調学会年次大会  2019.9 

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    Event date: 2019.9

    Language:Japanese  

    Venue:東京都江東区   Country:Japan  

  • Thermodynamic properties of binary mixtures of Trifluoroethene (HFO1123) + 2,3,3,3-Tetrafluoroprop-1-ene (HFO1234yf)

    Naoya Sakoda, Jiang Shiheng, Masaya Nakazaki, Yasuyuki Takata, Yukihiro Higashi

    25th IIR International Congress of Refrigeration, ICR 2019  2019.1 

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    Event date: 2019.8

    Language:English  

    Venue:Montreal   Country:Canada  

    PvTx properties of a binary mixture of 50 mass&#37; HFO1123 (trifluoroethene) + 50 mass&#37; HFO1234yf (2,3,3,3-tetrafluoroprop-1-ene) were measured in the temperature range from 294 to 410 K, in the density range between 83 kg.m-3 and 905 kg.m-3, and at pressures up to 8.1 MPa by an isochoric method, and the obtained data are compared with an equation of state (EOS) compiled in REFPROP 10.0. In addition, the critical parameters and saturated densities of the mixture were measured. Vapor-liquid equilibrium of HFO1123 + HFO1234yf was also measured at temperatures from 273 to 313 K by a recirculation method, and the binary interaction parameter of a cubic EOS was determined.

  • Molecular simulation for surface tension of new low GWP working fluids

    Céline Houriez, Michel Masella, Chieko Kondou, Yukihiro Higashi, Jamal El Abbadi, Christophe Coquelet

    25th IIR International Congress of Refrigeration, ICR 2019  2019.1 

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    Event date: 2019.8

    Language:English  

    Venue:Montreal   Country:Canada  

    In this work, the calculated surface tension of selected new low GWP (global warming potential) pure compound refrigerants HFO (hydro-fluoro-olefin) is presented. Molecular simulation methods are used to calculate the surface tension of R-1123 (trifluoroethylene) and of R-1234ze(E) (trans-1,3,3,3-tetrafluoroprop-1-ene), as well as densities at saturation. The results obtained by molecular simulation are compared with recent experimental data.

  • Performance analysis method for intermediated fluid type LNG vaporizers considering fluid properties

    Kosuke Higashi, Chieko Kondou, Yukihiro Higashi, Shigeru Koyama

    25th IIR International Congress of Refrigeration, ICR 2019  2019.1 

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    Event date: 2019.8

    Language:English  

    Venue:Montreal   Country:Canada  

    LNG (Liquefied Natural Gas) vaporizer is widely used all over the world to vaporize LNG by using seawater, etc. as a heating source. Intermediated Fluid type LNG Vaporizer (IFV) is using intermediated fluid between LNG and heating source. Propane has been used as an intermediated fluid conventionally, but new refrigerants except for propane are required because usage environment was diversified recently. In this study, refrigerants substitute for propane applicable to IFV were selected as R32 and R410A. On the basis of some experimental formula, prediction of boiling and condensation heat exchange quantity in tube bundles was also carried out and it enabled to predict actual IFV vaporization quantity with plus or minus 2 percent accuracy. The prediction demonstrated that those selected refrigerants can increase the vaporization rate with IFV from the base line of propane.

  • Surface tension measurement and modeling work for new low GWP working fluids

    Chieko Kondou, Jamal El Abbadi, Céline Houriez, Michel Masella, Yukihiro Higashi, Christophe Coquelet

    25th IIR International Congress of Refrigeration, ICR 2019  2019.1 

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    Event date: 2019.8

    Language:English  

    Venue:Montreal   Country:Canada  

    In this work, the surface tensions of some selected new low GWP (global warming potential) refrigerant mixtures containing HFOs (hydrofluoroolefins) were determined. The surface tension of the HFO-1123/HFC-32 was experimentally determined at temperatures from 265 K to near the critical points and with various compositions. Further, a model associating a cubic equation of state with the linear gradient theory was developed. Good agreement was observed between the experimentally obtained results and those obtained using the developed model.

  • Thermodynamic properties of binary mixtures of Trifluoroethene (HFO1123)+2,3,3,3-Tetrafluoroprop-1-ene(HFO1234yf) International conference

    N. Sakoda, Jiang SHIHENG, M. Nakazaki, Y. Takata, Y. Higashi

    The 25TH IIR International Congress Of Refrigeration (ICR2019)  2019.8 

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    Event date: 2019.8

    Language:English  

    Venue:Montreal, Qc   Country:Canada  

    Other Link: https://icr2019.org

  • Surface Tension Measurement and Modeling Work for New Low GWP Working Fluids International conference

    C. Kondou, Jamal EL ABBADI, Celine HOURIEZ, Michel MASELLA, Y. Higashi, Christophe COQUELET

    The 25TH IIR International Congress Of Refrigeration (ICR2019)  2019.8 

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    Event date: 2019.8

    Language:English  

    Venue:Montreal, Qc   Country:Canada  

    Other Link: https://icr2019.org

  • Molecular Simulation for Surface Tension of New Low GWP Working Fluids International conference

    Celine HOURIEZ, Michel MASELLA, C. Kondou, Y. Higashi, Jamal EL ABBADI, Cristophe COQUELET

    The 25TH IIR International Congress Of Refrigeration (ICR2019)  2019.8 

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    Event date: 2019.8

    Language:English  

    Venue:Montreal, Qc   Country:Canada  

    Other Link: https://icr2019.org

  • Heat pump cycle performance using low GWP ternary mixture of R32, R1234yf and R744 International conference

    Thu Kyaw, K. Takezato, S. Senba, U. C. A. Perera, N. Takata, Y. Higashi, T. Miyazaki

    International Workshop on Environmental Engineering 2019 (IWEE2019)  2019.6 

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    Event date: 2019.6

    Language:English  

    Venue:Nago   Country:Japan  

    Other Link: https://www.jsme.or.jp/env/iwee/2019

  • HFO1123混合冷媒の熱物性・伝熱特性およびサイクル特性評価 International conference

    東 之弘

    環境と新冷媒 国際シンポジウム2018  2018.12 

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    Event date: 2018.12

    Language:Japanese  

    Venue:兵庫県神戸市   Country:Japan  

  • 次世代冷媒R1224yd(Z)のPVT性質の測定

    迫田 直也, 東 之弘

    第39回日本熱物性シンポジウム  2018.11 

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    Event date: 2018.11

    Language:Japanese  

    Venue:愛知県名古屋市   Country:Japan  

  • Surface tension measurement for low GWP refrigerants HFO-1123 and HCFO-1224yd(z)

    Chieko Kondou, Yukihiro Higashi

    1st IIR International Conference on the Application of HFO Refrigerants, HFO 2018  2018.1 

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    Event date: 2018.9

    Language:English  

    Venue:Birmingham   Country:United Kingdom  

    By a differential capillary rise method, liquid-vapor interface surface tension was measured for new candidates of next generation refrigerant HFO-1123 and HCFO-1224yd(Z) at temperatures from 266 K to 304 K and from 266 K to 340 K, respectively. The repeatability and reproducibility of the measurement method were checked with HFC-134a and HFC-32. The propagated uncertainty in surface tension was estimated to be within ±0.2 mNm-1. Based on the measured data, the Van der Waals type empirical correlations were proposed for HFO-1123 and HCFO-1224yd(Z), those are associated with the critical temperatures reported by Higashi and Akasaka. These empirical correlations agree with the measured surface tension data within the measurement uncertainty in the tested temperature range.

  • Development of the equation of state for HCFO-1224yd(Z) Detailed and extensive evaluation of the current equation and outlook for a new equation

    Ryo Akasaka, Yukihiro Higashi, Shigeru Koyama

    1st IIR International Conference on the Application of HFO Refrigerants, HFO 2018  2018.1 

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    Event date: 2018.9

    Language:English  

    Venue:Birmingham   Country:United Kingdom  

    The first fundamental equation of state for HCFO-1224yd(Z) was published in 2017. This equation shows reasonable accuracies in the density and vapor pressure at moderate temperatures and pressures. In addition, this equation is designed to exhibit physically correct behavior in extrapolated regions. At high temperatures and pressures, however, uncertainties in calculated properties would be higher, because at this time available experimental data are limited to restricted ranges. This paper demonstrates comparisons of the current equation to some available experimental data and evaluates behavior of the equation in the extrapolated regions.

  • Surface Tension Measurement for Low GWP refrigerants HFO-1123 and HCFO-1224yd(Z) International conference

    C. Kondou, T. Tsuyashima, Y. Higashi

    1st IIR International Conference on the Application of HFO Refrigerants  2018.9 

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    Event date: 2018.9

    Language:English  

    Venue:Birmingham   Country:United Kingdom  

    Other Link: https://ior.org.uk/events/hfo2018

  • Development of the Equation of State for HCFO-1224yd(Z): Detailed and Extensive Evaluation of the Current Equation and Outlook for a New Equation International conference

    R. Akasaka, Y. Higashi, S. Koyama

    1st IIR International Conference on the Application of HFO Refrigerants  2018.9 

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    Event date: 2018.9

    Language:English  

    Venue:Birmingham   Country:United Kingdom  

  • Surface Tension Measurement of Low GWP Refrigerant Mixture HFO-1123/HFC-32 and HFO-1234ze(E)/HFC-32 International conference

    C. Kondou, T. Matsuzono, Y. Higashi

    the 17th International Refrigeration and Air Conditioning Conference  2018.7 

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    Event date: 2018.7

    Language:English  

    Venue:Purdue, West Lafayette   Country:United States  

    Other Link: https://engineering.purdue.edu/Herrick/Conferences/2018/2018_HLPurdueConferences_Program.pdf

  • Performance Evaluation of Heat Pump Cycle using Low GWP Refrigerant Mixtures of HFC-32 and HFO-1123 International conference

    S. Koyama, T. Miyazaki, J. Hirayama, N. Takata, Y. Higashi

    the 17th International Refrigeration and Air Conditioning Conference  2018.7 

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    Event date: 2018.7

    Language:English  

    Venue:Purdue, West Lafayette   Country:United States  

    Other Link: https://engineering.purdue.edu/Herrick/Conferences/2018/2018_HLPurdueConferences_Program.pdf

  • Surface tension measurement of low GWP refrigernat mixture HFO-1123/HFC-32

    Chieko Kondou, Taisuke Matsuzono, Taro Tsuyashima, Yukihiro Higashi

    9th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2018  2018.1 

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    Event date: 2018.6

    Language:English  

    Venue:Sapporo, Hokkaido   Country:Japan  

    The global warming is now one of the serious international concern should be tackled worldwide. HFC refrigerants, such as R410A, are categorized as the long lived green-house gasses. This paper presents the surface tension measurement data of HFO-1123 with GWP less than 1, and a binary mixture HFO-1123/HFC-32. The capillary constant and surface tension of those are measured across temperature range from 267 K to 307 K by a differential capillary rise with a propagated uncertainty ±0.3 mN m-1. Among the selected predicting methods, the correlations of Di Nicola et al. (2011) and Gharagheizi et al. (2012) show the best agreement to the measured surface tension of HFO-1123 alone. For HFO-1123/HFC-32, the correlation of Di Nicola et al. (2017) shows good agreement. To predict the surface tension HFO-1123/HFC-32, empirical correlation is proposed based on the measured data.

  • Thermodynamic Properties of Next Generation Refrigerants International conference

    Y. Higashi

    The 9th Asian Conference on Refrigeration and Air-conditioning(ACRA2018)  2018.6 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Sapporo   Country:Japan  

    Other Link: http://www.acra2018.org/

  • Surface Tension Measurement of Low GWP Refrigerant Mixture HFO-1123/HFC-32 International conference

    C. Kondou, T. Matsuzono, T. Tsuyashima, Y. Higashi

    The 9th Asian Conference on Refrigeration and Air-conditioning(ACRA2018)  2018.6 

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    Event date: 2018.6

    Language:English  

    Venue:Sapporo   Country:Japan  

    Other Link: http://www.acra2018.org/

  • 新しい低GWP冷媒の飽和蒸気圧の測定

    東 之弘, 迫田直也, MD Amirul Islam, 高田保之

    第38回日本熱物性シンポジウム  2017.11 

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    Event date: 2017.11

    Language:Japanese  

    Venue:つくば   Country:Japan  

  • R1123 を含む2成分系混合冷媒の気液平衡測定

    迫田直也, 江世恒, 高田保之, 東 之弘

    第38回日本熱物性シンポジウム  2017.11 

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    Event date: 2017.11

    Language:Japanese  

    Venue:つくば   Country:Japan  

  • R1123を成分物質にもつ2成分系混合冷媒の性質の測定

    迫田直也, ISLAM MD Amirul, 高田保之, 東 之弘

    平成29年度日本冷凍空調学会年次大会  2017.9 

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    Event date: 2017.9

    Language:Japanese  

    Venue:東京   Country:Japan  

  • 新冷媒R448A の熱力学性質の測定

    東 之弘

    平成29年度日本冷凍空調学会年次大会  2017.9 

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    Event date: 2017.9

    Language:Japanese  

    Venue:東京   Country:Japan  

  • 示差毛管上昇法による新規低GWP冷媒R1123 の表面張力の測定

    近藤智恵子, 東 之弘, 艶島太郎, 小山繁

    平成29年度日本冷凍空調学会年次大会  2017.9 

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    Event date: 2017.9

    Language:Japanese  

    Venue:東京   Country:Japan  

  • Vapor Pressure and Critical Pressure Measurements of R1233zd(E) and R336mzz International conference

    N. Sakoda, Amitul MD Islam, S. Koyama, Y. Takata, Y. Higashi

    21nd European Conference of Thermophysical Properties  2017.9 

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    Event date: 2017.9

    Language:English  

    Venue:Graz   Country:Austria  

  • Surface Tension Measurements of Low GWP Refrigerants International conference

    T. Matsuzono, C. Kondou, Y. Higashi, S. Koyama

    5th IIR Conference of Thermophysical Properties and Transfer Processes of Refrigeration  2017.5 

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    Event date: 2017.5

    Language:English  

    Venue:Seoul   Country:Korea, Republic of  

  • Fundamental research on next generation refrigerants for air conditioning system: assessment of thermophysical properties, heat transfer characteristics, and cycle performence International conference

    Y. Higashi, S. Koyama, A. Miyara, R. Akasaka, C. Kondou

    JRAIA International Symposium  2016.12 

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    Event date: 2016.12

    Language:English  

    Venue:Kobe   Country:Japan  

  • Fundamental research on next generation refriegerants for air conditioning systems International conference

    Y. Higashi, S. Koyama, A. Miyara, R. Akasaka, C. Kondou

    Internaional Symposium on New Regrigerants and Environmental Technology 2016, Kobe, Japan  2016.12 

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    Event date: 2016.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:神戸   Country:Japan  

  • Measurements of thermodynamic properties for the R290+R1270 mixture

    Y. Higashi

    The 37th Japan Symposium on Thermophysical Properties  2016.11 

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    Event date: 2016.11

    Language:Japanese  

    Venue:Okayama   Country:Japan  

  • Measurements of Vapor Pressures, Saturated Densities, and Criticala Parameters for R1224yd(Z) Invited International conference

    Y. Higashi

    11th Asian Thermophysical Properties Conference (ATPC)  2016.10 

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    Event date: 2016.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Yokohama   Country:Japan  

  • 次世代冷媒物性研究における現状と国際連携ネットワーク Invited

    東 之弘

    化学工学会第48回秋季大会  2016.9 

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    Event date: 2016.9

    Language:Japanese  

    Venue:徳島大学   Country:Japan  

  • Measurements of Thermodynamic Properties for R1123 and R1123+R32 Mixture International conference

    Y. Higashi, R. Akasaka

    16th International Refrigenration and Air Conditioning Conference  2016.7 

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    Event date: 2016.7

    Language:English  

    Venue:Purdue   Country:United States  

  • 新規冷媒R1123 の飽和蒸気圧,飽和密度および臨界定数の測定

    東 之弘, 赤坂 亮

    平成27年度日本冷凍空調学会年次大会  2015.10 

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    Event date: 2015.10

    Language:Japanese  

    Venue:東京   Country:Japan  

  • Thermophysical property measurements for new refrigerants and their mixtures Invited International conference

    Y. Higashi

    2nd Workshop of Low GWP Refrigerants: Joint International Research Opportunities  2015.9 

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    Event date: 2015.9

    Language:English   Presentation type:Symposium, workshop panel (public)  

    Venue:Yokohama   Country:Japan  

  • Determination of the critical point for low GWP refrigerants and their mixtures Invited

    Y. Higashi

    Workshop on Thermal Issues for Hydrogen and Related Energy Systems, 10th International Hydrogen Energy Development Forum 2016  2015.9 

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    Event date: 2015.9

    Language:English   Presentation type:Symposium, workshop panel (public)  

    Venue:I2CNER, Kyushu University, Fukuoka   Country:Japan  

  • Thermophysical property measurements for R1234yf + R1234ze(E) mixture

    Yukihiro Higashi

    24th IIR International Congress of Refrigeration, ICR 2015  2015.1 

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    Event date: 2015.8

    Language:English  

    Venue:Yokohama   Country:Japan  

    Measurements of PρTx properties, saturated densities and critical parameters for low GWP refrigerant mixtures of 50.00 mass&#37; R1234yf (2, 3, 3, 3-tetrafluoroprop-1-ene; CF3CF=CH2) + 50.00 mass&#37; R1234ze(E) (trans-1, 3, 3, 3-tetrafluoroprop-1-ene; CF3CH=CHF) system were measured with two types of isochoric methods. As for PρTx properties, 5 isochores were obtained in the range of temperatures from 310 K to 430 K, of pressures from 837 kPa to 6774 kPa, and of densities from 100 kg·m-3 to 900 kg·m-3. As for the saturated densities, 9 saturated vapor densities and 6 saturated liquid densities were measured for temperatures from 354.622 K to 374.280 K and for densities between 219 kg·m-3 and 870 kg·m-3. On the basis of the present data, the critical temperature Tc = 374.28 K, critical density ρc = 480 kg·m-3, and critical pressure Pc = 3524 kPa for 50&#37; R 1234yf + 50&#37; R 1234ze(E) mixture were determined by the direct observation of meniscus disappearance.

  • Surface tension of low GWP refrigerants R1234ze(Z) and R1233zd(E)

    Chieko Kondou, Ryuichi Nagata, Noriko Nii, Shigeru Koyama, Yukihiro Higashi

    24th IIR International Congress of Refrigeration, ICR 2015  2015.1 

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    Event date: 2015.8

    Language:English  

    Venue:Yokohama   Country:Japan  

    R1234ze(Z) and R1233zd(E) are very recently under consideration as a potential candidate to replace R245fa that is widely used in organic Rankine cycles and high-temperature industrial heat pumps. The capillary constant and surface tension of saturated R1234ze(Z) and R1233zd(E) were measured across the temperature range from 274 K to 350 K using a measuring apparatus based on the differential capillary rise method. The measurement uncertainty in the surface tension was typically 0.3 mN m-1. The experimental surface tension was well represented by a van der Waals type equation expressing the temperature dependence as, ω= 59.90 (1 - Tr)1.237 for R245fa, ω= 56.57 (1 - Tr) 1.220 for R1234ze(Z), and ω= 61.95 (1 - Tr) 1.277 for R1233zd(E), where, ω and Tr are the surface tension in mNm-1 and the reduced temperature, Tr = T/Tcrit. The critical temperatures Tcrit are given as 427.01 K for R245fa, 423.27 K for R1234ze(Z) by Higashi et al. (2015), and 438.75 K for R1233zd(E) by Hulse et al. (2012). The constants and exponents are empirically determined by the least square mean method. The above correlations represent the experimental surface tension within ±0.13, ±0.21 mN m1, and ±0.05 mN m-1 for R245fa, R1234ze(Z), and R1233zd(E), respectively.

  • Surface Tension of Low GWP Refrigerants R 1234ze(Z) and R 1233zd(E) International conference

    C. Kondou, R. Nagata, N. Nii, S. Koyama, Y. Higashi

    24th International Congress of Refrigeration  2015.8 

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    Event date: 2015.8

    Language:English  

    Venue:Yokohama   Country:Japan  

  • Thermophysical Property Measurements for R 1234yf + R 1234ze(E) Mixture International conference

    Y. Higashi

    24th International Congress of Refrigeration  2015.8 

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    Event date: 2015.8

    Language:English  

    Venue:Yokohama   Country:Japan  

  • Measurements of PρT Properties, Vapor Pressures, Saturated Densities, and Critical Parameters for R1243zf International conference

    Y. Higashi, C. Shirai, R. Akasaka

    19th Symposium on Thermophysical Properties  2015.6 

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    Event date: 2015.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • Thermophysical Property Measurements gor the Binary and Ternary Mixtures Composed of HFOs International conference

    C. Shirai, Y. Higashi, R. Akasaka

    19th Symposium on Thermophysical Properties  2015.6 

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    Event date: 2015.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • Measurements of Surface Tension for Refrigerants R245fa, R1243zf, R1234ze(Z), and R1233zd(E) International conference

    R. Nagata, C. Kondou, N. Nii, S. Koyama, Y. Higashi

    19th Symposium on Thermophysical Properties  2015.6 

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    Event date: 2015.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • A Preliminary Equation of State for 3,3,3-Trifluoroprop-1-ene (R1243zf) International conference

    R. Akasaka, Y. Higashi, A. Miyara, J. Steve Brown, S. Koyama

    19th Symposium on Thermophysical Properties  2015.6 

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    Event date: 2015.6

    Language:English  

    Venue:Boulder, Colorado, USA   Country:United States  

  • 冷媒 R1234ze(Z) および R 245fa の表面張力の測定

    永田龍一, 近藤智恵子, 仁位矩子, 小山 繁, 東 之弘

    第49回空気調和・冷凍連合講演会  2015.4 

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    Event date: 2015.4

    Language:Japanese  

    Venue:東京   Country:Japan  

  • Thermophysical property measurements of PrT properties, vapor pressures, saturated densities, surface tension, and critical parameters Invited International conference

    Y. Higashi

    Workshop of Low GWP Refrigerants: Joint International Research Opportunities  2014.12 

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    Event date: 2014.12

    Language:English   Presentation type:Symposium, workshop panel (public)  

    Venue:Padova   Country:Italy  

  • 混合作動流体 R 1234ze(Z) + R 32 および R 1234ze(Z) + R 134a 系の飽和密度および臨界軌跡の測定

    東 之弘, 白井千啓

    第35回日本熱物性シンポジウム  2014.11 

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    Event date: 2014.11

    Language:Japanese  

    Venue:東京   Country:Japan  

  • 混合作動流体 R 1234ze(Z) + R 32 および R 1234ze(Z) + R 134a 系のPvTx性質の測定

    白井千啓, 東 之弘

    第35回日本熱物性シンポジウム  2014.11 

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    Event date: 2014.11

    Language:Japanese  

    Venue:東京   Country:Japan  

  • 2成分系混合作動流体 R 134a + R 245fa 系の熱力学的性質、第1報:熱力学性質の測定

    東 之弘, 赤坂 亮

    平成26年度日本冷凍空調学会年次大会  2014.9 

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    Event date: 2014.9

    Language:Japanese  

    Venue:佐賀   Country:Japan  

  • 2成分系混合作動流体 R 134a + R 245fa 系の熱力学的性質、第2報:状態方程式の開発

    赤坂 亮, 東 之弘

    平成26年度日本冷凍空調学会年次大会  2014.9 

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    Event date: 2014.9

    Language:Japanese  

    Venue:佐賀   Country:Japan  

  • A Thermodynamic Property Model for the R 134a/245fa Mixtures International conference

    R. Akasaka, Y. Higashi

    15th International Refrigeration and Air Conditioning Conference  2014.7 

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    Event date: 2014.7

    Language:English  

    Venue:Purdue University   Country:United States  

  • Measurements of vapor pressures and critical parameters for 1,1,1,3,3-pentafluoropropane (R 245fa)

    Yukihiro Higashi, Ryo Akasaka

    7th Asian Conference on Refrigeration and Air Conditioning, ACRA 2014  2014.1 

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    Event date: 2014.5

    Language:English  

    Venue:Jeju Island   Country:Korea, Republic of  

    The determination of the critical parameters as well as the measurements of vapor pressures was made for 1,1,1,3,3-pentafluoropropane (R 245fa: C3H3F5). The critical temperature and critical density of R 245fa were determined by the direct observation of meniscus disappearance in consideration of the intensity of critical opalescence and meniscus disappearing level. The measurements of vapor pressures were carried out by the isochoric method. As for both of apparatus, temperature was measured with 25 Ω standard platinum resistance thermometer and thermometer bridge with an aid of ITS-90. The digital quartz pressure transducer and pressure indicator were used for the pressure measurements. And density was calculated from the sample mass and inner volume of pressure vessel. The experimental uncertainties of temperature, pressure, and density measurements are estimated within 20 mK, 1 kPa, and 0.1&#37;, respectively. Twenty-nine vapor pressure data for R 245fa were obtained in the temperature range from 310 K to the critical temperature and pressure up to 3.59 MPa with individual two runs. On the basis of these vapor-pressure measurements, the correlation of vapor pressures was proposed. The comparison with the vapor-pressure data reported by other investigators was also made. The authors are greatly indebted to Kobe Steel Ltd., Japan, for financial support, and to Asahi Glass Co., Japan, for furnishing and analyzing the high purity sample. The authors greatly thank to Messrs S. Hayasaka, C. Shirai, and Y. Oohira who are the student of Iwaki Meisei University, for their valuable assistance in the experiment. This work was supported by Grant-in-Aid for Scientific Research (C) 24560240 and 24560243 from Japan Societry for the Promotion of Science.

  • Measurements of Vapor Pressures and Critical Parameters for 1,1,1,3,3-Pentafluoropropane (R 245fa) International conference

    Y. Higashi, R. Akasaka

    7th Asian Conference on Refrigeration and Air Conditioning (ACRA 2014)  2014.5 

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    Event date: 2014.5

    Language:English  

    Venue:Juju   Country:Korea, Republic of  

  • 放電プラズマ焼結法による FeSi2系熱電変換モジュールの作製とその評価

    高澤勇輝, 藁谷真也, 鈴木裕宣, 安野拓也, 東 之弘

    粉体粉末冶金協会平成25年度秋期大会  2013.11 

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    Event date: 2013.11 - 2019.11

    Language:Japanese  

    Venue:名古屋   Country:Japan  

  • 放電プラズマ法により作製されたアルミナの透光性に及ぼす微細組織の影響

    白澤融, 川原正和, 鈴木裕宣, 東 之弘, 安野拓也, 巻野勇喜雄

    粉体粉末冶金協会平成25年度秋期大会  2013.11 

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    Event date: 2013.11

    Language:Japanese  

    Venue:名古屋   Country:Japan  

  • R 245fa および R 245fa + R 134a 混合冷媒の熱力学性質の測定

    早坂宗悟, 東 之弘, 赤坂 亮

    第34回日本熱物性シンポジウム  2013.11 

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    Event date: 2013.11

    Language:Japanese  

    Venue:富山   Country:Japan  

  • 放電プラズマ焼結法により作製された FeSi2系熱電変換モジュールの発電特性

    藁谷真也, 高澤勇輝, 鈴木裕宣, 安野拓也, 東 之弘

    日本機械学会第21回機械材料・材料加工技術講演会  2013.11 

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    Event date: 2013.11

    Language:Japanese  

    Venue:東京   Country:Japan  

  • 放電プラズマ法により作製された透光性アルミナ焼結体の微細組織観察

    白澤融, 川原正和, 鈴木裕宣, 巻野勇喜雄, 安野拓也, 東 之弘

    日本機械学会第21回機械材料・ 材料加工技術講演会  2013.11 

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    Event date: 2013.11

    Language:Japanese  

    Venue:東京   Country:Japan  

  • オレフィン系冷媒を含む低GWP混合冷媒の臨界定数の組成依存性

    東 之弘

    平成25年度日本冷凍空調学会年次大会  2013.9 

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    Event date: 2013.9

    Language:Japanese  

    Venue:東京   Country:Japan  

  • Measurements of PVT Properties, Vapor Pressures and Critical Parameters for Low GWP Refrigerant R-1234ze(Z) International conference

    Y. Higashi, S. Hayasaka, S. Ogiya

    4th IIR Conference of Thermophysical Properties and Transfer Processes of Refrigeration  2013.6 

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    Event date: 2013.6

    Language:English  

    Venue:Delft   Country:Netherlands  

  • A Fundamental Equation of State for Low GWP Refrigerant HFO-1234ze(Z) International conference

    R. Akasaka, Y. Higashi, S. Koyama

    4th IIR Conference of Thermophysical Properties and Transfer Processes of Refrigeration  2013.6 

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    Event date: 2013.6

    Language:English  

    Venue:Delft   Country:Netherlands  

  • 放電プラズマ法による FeSi2系熱電変換モジュールの作製

    高澤勇輝, 安野拓也, 東 之弘, 川原正和, 巻野勇喜雄

    日本機械学会第20回機械材料・材料加工技術講演会  2012.11 

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    Event date: 2012.11 - 2012.12

    Language:Japanese  

    Venue:大阪   Country:Japan  

  • 3成分系 R 1234ze(E) + R 32 + CO2 混合冷媒の熱力学性質の測定

    東 之弘, 宮良明男, 小山 繁

    日本機械学会熱工学コンフェレンス2012  2012.11 

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    Event date: 2012.11

    Language:Japanese  

    Venue:熊本   Country:Japan  

  • R 1234yf + R 134a系混合冷媒のPρTx性質の測定

    荻谷 俊, 下山田雅人, 東 之弘

    第33回日本熱物性シンポジウム  2012.10 

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    Event date: 2012.10

    Language:Japanese  

    Venue:大阪   Country:Japan  

  • 新規低 GWP冷媒 R-1234ze(Z) の飽和蒸気圧および PvT性質の測定

    東 之弘, 荻谷 俊

    平成24年度日本冷凍空調学会年次大会  2012.9 

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    Event date: 2012.9

    Language:Japanese  

    Venue:北海道   Country:Japan  

  • A Predictive Model for the Thermodynamic Properties of Mixtures International conference

    R. Akasaka, Y. Higashi

    18th Symposium on Thermophysical Properties  2012.6 

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    Event date: 2012.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • Measurements of Thermodynamic Properties and Critical Parameters for the Propylene (R 1270) + R 32 Mixture International conference

    Y. Higashi

    18th Symposium on Thermophysical Properties  2012.6 

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    Event date: 2012.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • プロピレン+ R 32 系混合冷媒の飽和密度および臨界軌跡の測定

    東 之弘, 赤津美穂子, 小林恵三

    第32回日本熱物性シンポジウム  2011.11 

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    Event date: 2011.11

    Language:Japanese  

    Venue:横浜   Country:Japan  

  • HFO-1234ze(E) + HFC-32系混合冷媒の熱力学モデリングとサイクル性能評価

    田中勝之, 赤坂 亮, 東 之弘

    第32回日本熱物性シンポジウム  2011.11 

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    Event date: 2011.11

    Language:Japanese  

    Venue:横浜   Country:Japan  

  • Measurements of Saturated Densities and Critical Parameters for the Binary HFC-1234yf + HFC-32 Mixtures International conference

    M. Akatsu, K. Tanaka, Y. Higashi

    23rd International Congress of Refrigeration  2011.10 

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    Event date: 2011.10

    Language:English  

    Venue:Prague   Country:Czech Republic  

  • Measurements of PρTx properties for the Binary HFC-1234yf + HFC-32 Mixtures International conference

    K. Kobayashi, K. Tanaka, Y. Higashi

    23rd International Congress of Refrigeration  2011.10 

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    Event date: 2011.10

    Language:English  

    Venue:Prague   Country:Czech Republic  

  • HFO系混合冷媒のPvTx性質の測定および相関

    小林恵三, 荻谷 俊, 田中勝之, 東 之弘

    平成23年度日本冷凍空調学会年次大会  2011.9 

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    Event date: 2011.9

    Language:Japanese  

    Venue:東京   Country:Japan  

  • HFO-1234ze(E) + HFC-32系混合冷媒の臨界軌跡の測定

    小林恵三, 田中勝之, 東 之弘

    第31回日本熱物性シンポジウム  2010.11 

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    Event date: 2010.11 - 2019.11

    Language:Japanese  

    Venue:福岡   Country:Japan  

  • 金属ベローズ型カロリメータによるHFO-1234ze(E)+HFC-32 系混合冷媒のPρTx 性質と定圧比熱の測定

    田中勝之, 東 之弘

    第31回日本熱物性シンポジウム  2010.11 

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    Event date: 2010.11

    Language:Japanese  

    Venue:福岡   Country:Japan  

  • Surface Tension of Low GWP Refrigerant Mixtures International conference

    K. Tanaka, K. Takahashi, K. Kobayashi, Y. Higashi

    5th Asian Conference on Refrigeration and Air-Conditioning  2010.10 

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    Event date: 2010.10

    Language:English  

    Venue:Tokyo   Country:Japan  

  • HFO-1234yf の気相域におけるPρT 性質の測定

    田中勝之, 東 之弘

    平成22年度日本冷凍空調学会年次大会  2010.9 

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    Event date: 2010.9

    Language:Japanese  

    Venue:金沢   Country:Japan  

  • HFO-1234ze(E) + HFC-32系混合冷媒のPρTx 性質の測定

    小林恵三, 田中勝之, 東 之弘

    平成22年度日本冷凍空調学会年次大会  2010.9 

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    Event date: 2010.9

    Language:Japanese  

    Venue:金沢   Country:Japan  

  • Trends of research and development for HFO refrigerants Invited

    東 之弘

    Seminar of Research and development up-to-date trend of the next generation refrigerant  2010.9 

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    Event date: 2010.9

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:Tokyo   Country:Japan  

  • Surface tension of low GWP refrigerant mixtures

    Katsuyuki Tanaka, Kohei Takahashi, Keizo Kobayashi, Yukihiro Higashi

    5th Asian Conference on Refrigeration and Air Conditioning - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System, ACRA 2010  2010.1 

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    Event date: 2010.6

    Language:English  

    Venue:Tokyo   Country:Japan  

    The surface tension of mixtures including low GWP refrigerants, 50 mass &#37; HFO-1234yf/50 mass &#37; HFC-32 and 50 mass &#37; HFO-1234ze(E)/50 mass &#37; HFC-32, was measured by the differential capillary-rise method in the temperature range from 273 K to 323 K. On a basis of the present data, correlations were formulated as a function of temperature by the expression of van der Waals type. A mixing rule for the coefficients in correlations of pure components was discussed for representing the data of mixtures. It is found to be difficult for representing the data of mixtures by a simple mixing rule.

  • Development of new generation refrigerant for preventing from global warming Invited

    東 之弘

    24th National Congress for Environmental Studies  2010.5 

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    Event date: 2010.5

    Language:Japanese  

    Venue:Tokyo   Country:Japan  

  • 地球温暖化防止のための新冷媒の探索

    東 之弘

    第24回環境工学連合講演会  2010.4 

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    Event date: 2010.4

    Language:Japanese  

    Venue:東京   Country:Japan  

  • Pressure-Volume-Temperature relationship for HFO-1234ze(E) + HFC-32 mixture International conference

    K. Tanaka, K. Kobayashi, Y. Higashi

    2010 International Symposium on Next-generation Air Conditioning and Refrigeration Technology  2010.2 

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    Event date: 2010.2

    Language:English  

    Venue:Tokyo   Country:Japan  

  • Thermophysical properties of HFO-1234yf and HFO-1234ze(E) Invited

    Y. Higashi

    2010 International Symposium on Next-generation Air Conditioning and Refrigeration Technology  2010.2 

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    Event date: 2010.2

    Language:English  

    Venue:Tokyo   Country:Japan  

  • HFO-1234ze(E)(trans-1,3,3,3-tetrafluoropropene)の臨界定数および気液共存曲線の測定

    市川智英, 田中勝之, 東 之弘

    第30回日本熱物性シンポジウム  2009.10 

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    Event date: 2009.10

    Language:Japanese  

    Venue:米沢   Country:Japan  

  • HFO-1234ze(E)の表面張力測定

    高橋紘平, 田中勝之, 東 之弘

    第30回日本熱物性シンポジウム  2009.10 

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    Event date: 2009.10

    Language:Japanese  

    Venue:米沢   Country:Japan  

  • HFO-1234yfの飽和蒸気圧および定圧比熱の測定

    高橋 元, 田中勝之, 東 之弘

    平成21年度日本冷凍空調学会年次大会  2009.10 

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    Event date: 2009.10

    Language:Japanese  

    Venue:東京   Country:Japan  

  • Thermodynamic Property Model of HFO-1234yf

    赤坂 亮, 田中勝之, 東 之弘

    平成21年度日本冷凍空調学会年次大会  2009.10 

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    Event date: 2009.10

    Language:Japanese  

    Venue:東京   Country:Japan  

  • 低GWP 冷媒 HFO-1234yf の熱力学性質

    東 之弘, 田中勝之, 赤坂 亮

    第19回環境工学総合シンポジウム  2009.7 

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    Event date: 2009.7

    Language:Japanese  

    Venue:沖縄   Country:Japan  

  • Thermodynamic properties of HFO-1234yf(2,3,3,3-tetrafluoropropene) International conference

    K. Tanaka, Y. Higashi

    3rd IIR Conference on Thermophysical Properties and Transport Processes of Refrigerants  2009.6 

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    Event date: 2009.6

    Language:English  

    Venue:Boulder, Denver   Country:United States  

  • Measurements of the surface tension for 2,3,3,3-tetrafluoropropene (HFO-1234yf) International conference

    K. Takahashi, K. Tanaka, Y. Higashi

    17th Symposium on Thermophysical Properties  2009.6 

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    Event date: 2009.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • Measurements of the critical parameters and vapor-liquid coexistence curve for 2,3,3,3-tetrafluoropropene International conference

    T. Ichikawa, K. Tanaka, Y. Higashi

    17th Symposium on Thermophysical Properties  2009.6 

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    Event date: 2009.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • Measurements of vapor pressure and isobaric specific heat capacity of 2,3,3,3-tetrafluoropropene (HFO-1234yf) International conference

    G. Takahashi, K. Tanaka, Y. Higashi

    17th Symposium on Thermophysical Properties  2009.6 

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    Event date: 2009.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • A practical equation of state for 2,3,3,3-tetrafluoropropene (HFO-1234yf) to calculate saturation properties International conference

    R. Akasaka, K. Tanaka, Y. Higashi

    17th Symposium on Thermophysical Properties  2009.6 

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    Event date: 2009.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • HFO-1234yfの表面張力測定

    高橋紘平, 田中勝之, 東 之弘

    第43回空気調和・冷凍連合講演会  2009.4 

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    Event date: 2009.4

    Language:Japanese  

    Venue:東京   Country:Japan  

  • HFO-1234yfの臨界定数および気液共存曲線の測定

    市川智英, 田中勝之, 東 之弘

    第43回空気調和・冷凍連合講演会  2009.4 

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    Event date: 2009.4

    Language:Japanese  

    Venue:東京   Country:Japan  

  • HFO-1234yfの飽和蒸気圧および定圧比熱の測定

    高橋 元, 田中勝之, 東 之弘

    第43回空気調和・冷凍連合講演会  2009.4 

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    Event date: 2009.4

    Language:Japanese  

    Venue:東京   Country:Japan  

  • 2,3,3,3-tetrafluoropropene (HFO1234yf)の熱物性値

    田中勝之, 東 之弘

    第29回日本熱物性シンポジウム  2008.10 

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    Event date: 2008.10

    Language:Japanese  

    Venue:東京   Country:Japan  

  • Calorimeter for measuring the isobaric specific heat capacity of natural refrigerants International conference

    K. Tanaka, G. Takahashi, A. Kitayama, Y. Higashi

    8th IIR-Gustav Lorentzen Conference on Natural Working Fluids  2008.5 

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    Event date: 2008.5

    Language:English  

    Venue:Copenhagen   Country:Denmark  

  • FeSi2の実用向け熱電・発熱デバイスの製作

    安野拓也, 宍戸宏典, 田中勝之, 東 之弘

    応用物理学会「シリサイド系熱・電気エネルギー変換材料の基礎と実用化技術」  2008.3 

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    Event date: 2008.3

    Language:Japanese  

    Country:Japan  

  • 放電プラズマ焼結・接合法によるFeSi2系熱電変換材料のp-n直接接合

    安野拓也, 宍戸宏典, 田中勝之, 東 之弘

    日本機械学会機械材料・材料加工技術講演会  2007.11 

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    Event date: 2007.11

    Language:Japanese  

    Venue:長岡   Country:Japan  

  • Vapor-liquid equilibrium measurements for the CO2 + R290 mixture International conference

    Y. Higashi, K. Tanaka, R. Akasaka , Y. Kayukawa, K. Fujii

    22nd International Congress of Refrigeration  2007.11 

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    Event date: 2007.11

    Language:English  

    Venue:Beijing   Country:China  

  • FeSi2系熱電変換モジュールのゼーベック係数の測定

    田中勝之, 安野拓也, 東 之弘

    第28回日本熱物性シンポジウム  2007.10 

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    Event date: 2007.10

    Language:Japanese  

    Venue:札幌   Country:Japan  

  • 2成分系混合物 CO2 + R290 の気液平衡の測定

    東 之弘, 田中勝之, 赤坂 亮, 粥川洋平, 藤井賢一

    平成19年度日本冷凍空調学会年次大会  2007.10 

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    Event date: 2007.10

    Language:Japanese  

    Venue:東京農工大学   Country:Japan  

  • R290+R600a 系混合冷媒の表面張力の測定

    田中勝之, 東 之弘, 岡田昌章

    平成18年度日本冷凍空調学会学年次大会  2006.10 

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    Event date: 2006.10

    Language:Japanese  

    Venue:福岡   Country:Japan  

  • R290+R600a+R32 系混合冷媒の気液平衡性質の測定

    田中勝之, 東 之弘, 粥川洋平, 藤井賢一

    平成18年度日本冷凍空調学会学年次大会  2006.10 

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    Event date: 2006.10

    Language:Japanese  

    Venue:福岡   Country:Japan  

  • アルコール水溶液を対象とした示差毛管上昇法による表面張力測定装置の改良

    田中勝之, 東 之弘

    第27回日本熱物性シンポジウム  2006.10 

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    Event date: 2006.10

    Language:Japanese  

    Venue:京都   Country:Japan  

  • 教育支援用地球温暖化体感実験装置の開発

    田中勝之, 東 之弘

    日本エネルギー環境教育学会全国大会  2006.8 

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    Event date: 2006.8

    Language:Japanese  

    Country:Japan  

  • Vapor-liquid equilibrium measurements for the binary and ternary mixtures of R290, R600a, and R32 at temperatures between 260 K and 330 K International conference

    K. Tanaka, Y. Higashi, Y. Kayukawa, K. Fujii

    16th Symposium on Thermophysical Properties  2006.6 

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    Event date: 2006.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • Measurements of the surface tension for some alcohols International conference

    K. Tanaka, Y. Higashi

    16th Symposium on Thermophysical Properties  2006.6 

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    Event date: 2006.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • Measurements of the surface tension for the R290 + R600a mixtures

    Katsuyuki Tanaka, Yukihiro Higashi

    3rd Asian Conference on Refrigeration and Air-Conditioning, ACRA 2006  2006.1 

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    Event date: 2006.5

    Language:English  

    Venue:Gyeongju   Country:Korea, Republic of  

    The surface tension of the R290 + R600a mixture has been measured by the differential capillary-rise method. For measuring the binary system, the apparatus was modified to determine the composition of the sample. Seventeen data with a change of composition were obtained at 278.28 K. The experimental uncertainties of temperature and surface tension measurements are estimated to be within 20 mK and 0.2 mN·m-1, respectively. The present data are compared with REFPROP ver.7.0 calculations [1]. As for composition dependence, the present data show different behavior against to REFPROP ver.7.0 calculations. Three kinds of mixing rules were tested for representing the composition dependence of the present data. It is found the simple mixing rule by mole fraction is effective for the R290 + R600a mixture.

  • Measurements of the surface tension for the R290 + R600a mixture International conference

    K. Tanaka, Y. Higashi

    3rd Asian Conference on Refrigeration and Air-Conditioning  2006.3 

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    Event date: 2006.3

    Language:English  

    Venue:Gyeongju   Country:Korea, Republic of  

  • 代替フロン混合冷媒の気液平衡性質に関する研究

    北郷智宣, 田中勝之, 東 之弘, 粥川洋平, 藤井賢一

    日本機械学会東北支部  2006.3 

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    Event date: 2006.3

    Language:Japanese  

    Venue:福島   Country:Japan  

  • アルコールの表面張力測定

    福井明日香, 田中勝之, 東 之弘

    日本機械学会東北支部  2006.3 

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    Event date: 2006.3

    Language:Japanese  

    Venue:福島   Country:Japan  

  • 固体熱伝導率測定装置の開発

    荒井周一, 金子直樹, 田中勝之, 東 之弘

    日本機械学会東北支部  2006.3 

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    Event date: 2006.3

    Language:Japanese  

    Venue:福島   Country:Japan  

  • イソブタンの表面張力測定

    田中勝之, 東 之弘

    第26回日本熱物性シンポジウム  2005.11 

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    Event date: 2005.11

    Language:Japanese  

    Venue:つくば   Country:Japan  

  • Composition dependence of the critical parameters for the binary mixtures of R32+R290, R32+R600a, and R290+R600a system International conference

    Y. Higashi

    Thermophysical Properties and Transport Processes of Refrigerants  2005.9 

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    Event date: 2005.9

    Language:English  

    Venue:Vicenza   Country:Italy  

  • 放電プラズマ焼結法によるFeSi2系熱電変換材料の創製とその熱電特性

    星圭一郎, 安野拓也, 東 之弘

    日本機械学会東北支部  2005.3 

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    Event date: 2005.3

    Language:Japanese  

    Venue:宮城   Country:Japan  

  • 炭化水素系プロパン+イソブタン混合物の臨界軌跡

    東 之弘

    平成16年度日本冷凍空調学会学術講演会  2004.10 

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    Event date: 2004.10

    Language:Japanese  

    Venue:浜松   Country:Japan  

  • 1ーブタノール水溶液における表面張力および密度の測定

    岩崎絵美, 東 之弘, 岡田昌章

    第25回日本熱物性シンポジウム  2004.10 

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    Event date: 2004.10

    Language:Japanese  

    Venue:長野   Country:Japan  

  • Measurements of saturated densities and critical parameters for the propane + isobutane system International conference

    Y. Higashi

    Natural Working Fluids 2004: 6th IIR-Gustav Lorentzen Conference  2004.10 

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    Event date: 2004.10

    Language:English  

    Venue:Glasgow   Country:United Kingdom  

  • Measurements of the surface tension and density for ethanol and 1-butanol International conference

    E. Iwasaki, Y. Higashi, M. Okada

    Natural Working Fluids 2004: 6th IIR-Gustav Lorentzen Conference  2004.10 

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    Event date: 2004.10

    Language:English  

    Venue:Glasgow   Country:United Kingdom  

  • 1ーブタノールにおける表面張力および密度の測定

    岩崎絵美, 小林千恵, 東 之弘, 岡田昌章, 阿部宜之

    第24回日本熱物性シンポジウム  2003.11 

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    Event date: 2003.10

    Language:Japanese  

    Venue:岡山   Country:Japan  

  • Determination of the critical parameters for propane (R290) and isobutane (R600a) International conference

    Y. Higashi

    15th Symposium on Thermophysical Properties  2003.9 

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    Event date: 2003.9

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • Experimental determination of the critical locus for the difluoromethane (R32) and propane (R290) International conference

    Y. Higashi

    International Symposium on Molecular Thermodynamics and Molecular Simulation  2003.5 

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    Event date: 2003.5

    Language:English  

    Venue:Sendai   Country:Japan  

  • プロパン(R290)およびイソブタン(R600a)の臨界定数の決定

    東 之弘

    第23回日本熱物性シンポジウム  2002.11 

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    Event date: 2002.11

    Language:Japanese  

    Venue:東京   Country:Japan  

  • R32+R125系混合冷媒の気液平衡性質の測定

    三宅岳志, 東 之弘, 藤井賢一

    平成14年度日本冷凍空調学会学術講演会  2002.11 

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    Event date: 2002.11

    Language:Japanese  

    Venue:岡山   Country:Japan  

  • R32+R290系混合冷媒の臨界軌跡の決定

    東 之弘

    平成14年度日本冷凍空調学会学術講演会  2002.11 

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    Event date: 2002.11

    Language:Japanese  

    Venue:岡山   Country:Japan  

  • Currently reliable property values and simple equationfor pure hydrofluorocarbons International conference

    H. Sato, N. Kagawa, Y. Takaishi, Y. Higashi, C. Yokoyama, K. Fujii, K. Murakami, M.J.Assael, M. Noguchi, H. Tanabe, M. Fukushima, K. Takigawa

    9th International Refrigeration and Air Conditioning Conference  2002.7 

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    Event date: 2002.7

    Language:English  

    Venue:Purdue University   Country:United States  

  • アセトン/イソプロピルアルコール混合物の表面張力の測定

    岡田昌章, 東 之弘

    第22回日本熱物性シンポジウム  2001.11 

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    Event date: 2001.11

    Language:Japanese  

    Venue:仙台   Country:Japan  

  • Vapor-liquid equilibrium measurements for the R410A and R407C mixtures in the temperature range between 263.15 K and 293.15 K International conference

    Y. Higashi, K. Suzaka, K. Fujii

    Thermophysical Properties and Transfer Processes of New Refrigerants, IIR Conference  2001.9 

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    Event date: 2001.9

    Language:English  

    Venue:Paderborn   Country:Germany  

  • 気液平衡性質測定装置の開発

    須坂健一, 東 之弘, 藤井賢一

    第21回日本熱物性シンポジウム  2000.10 

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    Event date: 2000.10

    Language:Japanese  

    Venue:名古屋   Country:Japan  

  • Critical locus measurement for the binary difluoromethane (R32) + propane (R290) International conference

    Y. Higashi

    14th Symposium on Thermophysical Properties  2000.6 

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    Event date: 2000.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • Design of a small-volume, quad-cell, dual-method, dew/bubble point apparatus International conference

    C. D. Holcomb, Y. Higashi, S. L. Outcult

    14th Symposium on Thermophysical Properties  2000.6 

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    Event date: 2000.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • Surface tension of HFC refrigerant mixtures

    M. Okada, T. Shibata, Y. Sato, Y. Higashi

    Proceedings of 1997 13th Symposium on Thermophysical Properties  1999.1 

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    Event date: 1997.6

    Language:English  

    Venue:Boulder, CO, USA   Country:Other  

    The surface tension of several refrigerant mixtures was measured and correlated. The measurements were conducted using the differential capillary rise method (DCRM) under conditions of coexistence of the sample liquid and its saturated vapor in equilibrium. The temperature range covered was from 273 to 323 K. The resulting data were represented by a mixing rule using mass friction based on the van der Waals correlation.

  • Surface tension of HFC Refrigerant mixtures International conference

    M. Okada, T. Shibata, Y. Sato, Y. Higashi

    13th Symposium on Thermophysical Properties  1997.6 

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    Event date: 1997.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • Critical locus for binary and ternary HFC refrigerant mixtures International conference

    Y. Higashi

    13th Symposium on Thermophysical Properties  1997.6 

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    Event date: 1997.6

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • 循環法による新規代替混合冷媒の気液平衡測定(第1報:R-410AおよびR-410Bの気液平衡)

    樋口 知, 高島啓行, 東 之弘, 藤田佳孝, 藤井賢一, 田中 充

    第17回日本熱物性シンポジウム  1996.11 

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    Event date: 1996.11

    Language:Japanese  

    Venue:筑波   Country:Japan  

  • フロン系混合冷媒R-407C, R-410A および R-410Bの表面張力測定

    柴田貴偉, 東 之弘, 岡田昌章

    第17回日本熱物性シンポジウム  1996.11 

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    Event date: 1996.11

    Language:Japanese  

    Venue:筑波   Country:Japan  

  • 循環法による新規代替混合冷媒の気液平衡測定(第2報:測定装置の改良とR-407C の気液平衡)

    高島啓行, 樋口 知, 東 之弘, 藤田佳孝, 藤井賢一, 田中 充

    第17回日本熱物性シンポジウム  1996.11 

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    Event date: 1996.11

    Language:Japanese  

    Venue:筑波   Country:Japan  

  • HFC系混合冷媒の臨界軌跡の相関

    東 之弘

    平成8年度日本冷凍協会学術講演会  1996.11 

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    Event date: 1996.11

    Language:Japanese  

    Venue:博多   Country:Japan  

  • HFC系混合冷媒の表面張力の相関

    岡田昌章, 柴田貴偉, 東 之弘

    平成8年度日本冷凍協会学術講演会  1996.11 

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    Event date: 1996.11

    Language:Japanese  

    Venue:博多   Country:Japan  

  • HFC系冷媒の臨界定数の評価

    東 之弘

    平成8年度日本冷凍協会学術講演会  1996.11 

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    Event date: 1996.11

    Language:Japanese  

    Venue:博多   Country:Japan  

  • Vapor-liquid equilibrium and critical point for the R32/R125/R134a mixture International conference

    Y. Higashi

    AIChE 1996 Spring National Meeting  1996.4 

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    Event date: 1996.4

    Language:English  

    Venue:New Orleans   Country:United States  

  • R-125/134a 系混合冷媒の気液平衡測定

    M. Higuchi, Y. Higashi

    第16回日本熱物性シンポジウム  1995.11 

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    Event date: 1995.11

    Language:Japanese  

    Venue:広島   Country:Japan  

  • 代替冷媒 R-143aの表面張力測定

    T. Shibata, Y. Higashi, M. Okada

    第16回日本熱物性シンポジウム  1995.11 

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    Event date: 1995.11

    Language:Japanese  

    Venue:広島   Country:Japan  

  • 混合冷媒 R-507および R-407Cの臨界定数の決定

    T. Ikeda, Y. Higashi

    第16回日本熱物性シンポジウム  1995.11 

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    Event date: 1995.11

    Language:Japanese  

    Venue:広島   Country:Japan  

  • R-125/143a 系混合冷媒の気液平衡測定

    H. Takashima, Y. Higashi

    第16回日本熱物性シンポジウム  1995.11 

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    Event date: 1995.11

    Language:Japanese  

    Venue:広島   Country:Japan  

  • Critical parameters for 1,1,1-trifluoroethane(R-143a) International conference

    Y. Higashi, T. Ikeda

    4th Asian Thermophysical Properties Conference  1995.9 

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    Event date: 1995.9

    Language:English  

    Venue:Tokyo   Country:Japan  

  • Vapor-liquid equilibrium, coexistence curve and critical locus for binary R-32/125 mixture International conference

    Y. Higashi

    19th International Congress of Refrigeration  1995.4 

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    Event date: 1995.4

    Language:English  

    Venue:Hague   Country:Netherlands  

  • HFC系冷媒 R-143aの臨界定数の決定

    池田長明, 東 之弘

    第29回空気調和・冷凍連合講演会  1995.4 

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    Event date: 1995.4

    Language:Japanese  

    Venue:東京   Country:Japan  

  • HFC-32/HFC-134a 系混合冷媒の臨界圧力の推算

    金井耕一, 東 之弘

    第29回空気調和・冷凍連合講演会  1995.4 

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    Event date: 1995.4

    Language:Japanese  

    Venue:東京   Country:Japan  

  • JAR Refrigerant database and thermodynamic tables project International conference

    H. Sato, Y. Higashi, N. Kagawa, M. Okada, Y. Takaishi, K. Fujii

    Asia-Pacific Conference on the Built Environment, Singapore, ASHRAE(1995)  1995.2 

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    Event date: 1995.2

    Language:English  

    Country:Singapore  

  • Vapor-liquid equilibrium for propane/iso-butane mixture International conference

    Y. Higashi, M.Funakura, Y. Yoshida

    the International Conference, "CFCs, The Day After"  1994.11 

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    Event date: 1994.11

    Language:English  

    Venue:Padova   Country:Italy  

  • 混合冷媒の熱物性とその問題点

    東 之弘

    日本伝熱学会・東北研究グループ秋期伝熱セミナー  1994.11 

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    Event date: 1994.11

    Language:Japanese  

    Country:Japan  

  • Surface tension correlation for HCFCs and HFCs International conference

    M. Okada, Y. Higashi

    the International Conference, "CFCs, The Day After"  1994.11 

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    Event date: 1994.11

    Language:English  

    Venue:Padova   Country:Italy  

  • Determination of the critical locus for binary R-32/125 mixture

    T. Ikeda, K. Kanai, Y. Higashi

    第15回 日本熱物性シンポジウム  1994.10 

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    Event date: 1994.10

    Language:English  

    Venue:富山   Country:Japan  

  • Vapor-liquid equilibrium, coexistence curve and critical locus for binary HFC-32/HFC-134a mixture International conference

    Y. Higashi

    the 12th Symposium on Thermophysical Properties  1994.9 

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    Event date: 1994.9

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • Experimental surface tension for HFC-32, HCFC-124, HFC-125, HCFC-141b, HCFC-142b and HFC-152a International conference

    M. Okada, Y. Higashi

    the 12th Symposium on Thermophysical Properties  1994.9 

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    Event date: 1994.9

    Language:English  

    Venue:Boulder, Colorado   Country:United States  

  • HFC-32/HFC-134a 系混合冷媒の臨界軌跡の決定

    東 之弘, 池田長明, 金井耕一

    第28回空気調和・冷凍連合講演会  1994.4 

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    Event date: 1994.4

    Language:Japanese  

    Venue:東京   Country:Japan  

  • HFC-32/HFC-134a系混合冷媒の熱力学性質の推算とサイクル計算への影響

    福島正人, 大歳幸男, 東 之弘

    第28回空気調和・冷凍連合講演会  1994.4 

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    Event date: 1994.4

    Language:Japanese  

    Venue:東京   Country:Japan  

  • HFC-32/HFC-134a 系混合冷媒の気液平衡

    東 之弘, 杉本茂樹, 小椋康平, 榎本 愛

    第28回空気調和・冷凍連合講演会  1994.4 

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    Event date: 1994.4

    Language:Japanese  

    Venue:東京   Country:Japan  

  • Vapor-liquid equilibrium for HFC-32/HFC-125 mixture

    Y. Higashi

    第14回日本熱物性シンポジウム  1993.11 

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    Event date: 1993.11

    Language:English  

    Venue:横浜   Country:Japan  

  • Measurements of the surface tension for HFC-32 and HFC-125

    M. Okada, Y. Higashi

    第14回日本熱物性シンポジウム  1993.11 

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    Event date: 1993.11

    Language:English  

    Venue:横浜   Country:Japan  

  • Measurements of the critical parameters for HFC-32

    Y. Higashi, H. Imaizumi, S. Usuba

    第13回 日本熱物性シンポジウム  1992.9 

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    Event date: 1992.9

    Language:English  

    Venue:秋田   Country:Japan  

  • Measurements of the surface tension for HCFC-124 and HCFC-141b

    M. Okada, Y. Higashi

    第13回日本熱物性シンポジウム  1992.9 

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    Event date: 1992.9

    Language:English  

    Venue:秋田   Country:Japan  

  • Measurements of the surface tension for HCFC-142b and HFC-152a

    M. Okada, Y. Higashi, T. Ikeda, T. Kuwana

    第12回日本熱物性シンポジウム  1991.11 

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    Event date: 1991.11

    Language:English  

    Venue:京都   Country:Japan  

  • Measurements of the surface tension for CFC alternatives International conference

    Y. Higashi, M. Okada

    18th International Congress of Refrigeration  1991.2 

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    Event date: 1991.2

    Language:English  

    Venue:Montreal   Country:Canada  

  • Procedure for the assessment of the critical parameters of fluids

    Y. Higashi

    第11回日本熱物性シンポジウム  1990.10 

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    Event date: 1990.11

    Language:English  

    Venue:東京   Country:Japan  

  • Correlation of the saturated densities for halogenated hydrocarbons and their mixtures International conference

    Y. Higashi

    2nd Asian Thermodynamic Properties Conference  1989.10 

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    Event date: 1989.10

    Language:English  

    Venue:Sapporo   Country:Japan  

  • Thermodynamic behavior of the vapor-liquid coexistence curve for binary refrigerant mixtures International conference

    Y. Higashi, M. Uematsu, K. Watanabe

    17th International Congress of Refrigeration  1987.5 

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    Event date: 1987.5

    Language:English  

    Venue:Wien   Country:Austria  

  • Correlation of the vapor-liquid coexistence curve for binary refrigerant mixtures International conference

    Y. Kabata, Y. Higashi, K. Watanabe

    17th International Congress of Refrigeration  1987.5 

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    Event date: 1987.5

    Language:English  

    Venue:Wien   Country:Austria  

  • Assessment of the predictive methods of the critical parameters for binary refrigerant mixtures International conference

    Y. Higashi, M. Uematsu, K. Watanabe

    1987 ASME-JSME Thermal Engineering Joint & Conference  1987.4 

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    Event date: 1987.4

    Language:English  

    Venue:Hawaii   Country:United States  

  • Generalized representaion of vapor-pressure curve for halogenated hydrocarbons International conference

    M. Ashizawa, Y. Higashi, M. Uematsu, K. Watanabe

    1987 ASME-JSME Thermal Engineering Joint Conference  1987.4 

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    Event date: 1987.4

    Language:English  

    Venue:Hawaii   Country:United States  

  • Measurements of the vapor-liquid coexistence curve for the R-152a + R-114 system in the critical region

    Y. Kabata, Y. Higashi, M.Uematsu, K. Watanabe

    第7回日本熱物性シンポジウム  1986.10 

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    Event date: 1986.10

    Language:English  

    Venue:筑波   Country:Japan  

  • Thermophysical properties of nonazeotropic refrigerant blends International conference

    Y. Higashi, K. Watanabe

    ASME paper, 86-WA/HT-72  1986.5 

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    Event date: 1986.5

    Language:English  

    Country:Japan  

  • Study of the critical locus for non-azeotropic refrigerant mixtures

    Y. Higashi, H. Hasebe, M. Uematsu, K. Watanabe

    第6回日本熱物性シンポジウム  1985.11 

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    Event date: 1985.11

    Language:English  

    Venue:仙台   Country:Japan  

  • 変容法によるPVTX 性質測定装置の設計

    上村 徹, 東 之弘, 上松公彦, 渡部康一

    高圧討論会  1985.10 

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    Event date: 1985.10

    Language:Japanese  

    Venue:徳島   Country:Japan  

  • Critical locus for several binary mixtures of halogenated hydrocarbons International conference

    Y. Higashi, M. Uematsu, K. Watanabe

    International Symposium on High Pressure Chemical & Engineering  1984.3 

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    Event date: 1984.3

    Language:Japanese   Presentation type:Symposium, workshop panel (public)  

    Venue:Erlangen   Country:Germany  

  • Direct determination of the critical parameters of fluids International conference

    Y. Higashi, M. Uematsu, K. Watanabe

    Japan-U.S. Joint Seminar on Thermophysical Properties  1983.9 

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    Event date: 1983.9

    Language:English   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:Tokyo   Country:Japan  

  • Direct determination of the critical parameters for several refrigerants International conference

    Y. Higashi, M. Uematsu, K. Watanabe

    16th International Congress of Refrigeration  1983.7 

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    Event date: 1983.7

    Language:English  

    Venue:Paris   Country:France  

  • エタノールの表面張力測定

    小林千恵, 岩崎絵美, 東 之弘, 岡田昌章

    平成15年度日本冷凍空調学会学術講演会, 2003 

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    Language:Japanese  

    Venue:東京   Country:Japan  

  • 炭化水素系混合冷媒の熱物性 -PVT 性質および気液平衡性質-

    粥川洋平, 藤井賢一, 東 之弘, 渡部康一

    平成15年度日本冷凍空調学会学術講演会, 2003 

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    Language:Japanese  

    Venue:東京   Country:Japan  

  • 高出力バッテリー内の冷却システムの研究

    佐々木重行, 東 之弘, 古川 淳

    日本機械学会東北支部第39期秋季講演会, 2003 

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    Language:Japanese  

    Venue:郡山   Country:Japan  

  • 三次元筐体内における自然対流のシミュレーション

    露木浩二, 五十嵐三武郎, 東 之弘, 田淵清年

    平成9年度日本機械学会東北支部いわき地方講演会, 1997 

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    Language:Japanese  

    Venue:いわき   Country:Japan  

  • 代替混合冷媒 R-507 および R-404A の表面張力測定

    佐藤佑也, 東 之弘, 岡田昌章

    平成9年度日本機械学会東北支部いわき地方講演会, 1997 

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    Venue:いわき   Country:Japan  

  • R-134a/n-ペンタン系混合冷媒の気液平衡性質の測定

    永村浩之, 東 之弘

    平成9年度日本機械学会東北支部いわき地方講演会, 1997 

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    Language:Japanese  

    Venue:いわき   Country:Japan  

  • 3成分系混合冷媒の気液平衡測定

    野木貴之, 東 之弘

    平成9年度日本機械学会東北支部いわき地方講演会, 1997 

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    Language:Japanese  

    Venue:いわき   Country:Japan  

  • 自然冷媒の飽和蒸気圧および標準沸点の測定

    樋口 知, 東 之弘, 佐々木正夫

    平成9年度日本機械学会東北支部いわき地方講演会, 1997 

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    Venue:いわき   Country:Japan  

  • フロン系冷媒 R-114 の気液共存曲線の測定および臨界定数の決定

    東 之弘, 上松公彦, 渡部康一

    日本機械学会,1984 

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    Language:Japanese  

    Country:Japan  

  • フロン系混合冷媒 R-22 + R-114系の臨界域における気液共存曲線の測定

    東 之弘, 上松公彦, 渡部康一

    日本冷凍協会学術講演会, 1984 

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    Language:Japanese  

    Country:Japan  

  • フロン系冷媒 R-502 の気液共存曲線および臨界定数の決定

    東 之弘, 上松公彦, 渡部康一

    日本機械学会, 1983 

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    Language:Japanese  

    Country:Japan  

  • フロン系冷媒R-13B1 の臨界域における気液共存曲線の測定

    東 之弘, 上松公彦, 渡部康一

    日本機械学会, 1982 

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    Language:Japanese  

    Country:Japan  

  • フロン系冷媒R-12および R-22の臨界定数の決定

    東 之弘, 上松公彦, 渡部康一

    日本冷凍協会学術講演会  1982.11 

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    Venue:東京   Country:Japan  

  • 2成分系混合冷媒R-12 + R-22系の臨界域における共存曲線の決定

    東 之弘, 岡崎志朗, 高石吉登, 上松公彦, 渡部康一

    日本機械学会, 1981 

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    Language:Japanese  

    Country:Japan  

  • ASSESSMENT OF THE PREDICTIVE METHODS OF THE CRITICAL PARAMETERS FOR BINARY REFRIGERANT MIXTURES.

    Yukihiro Higashi, M. Uematsu, K. Watanabe

    1987.1 

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    The assessment of the predictive methods of the critical parameters is discussed on the basis of the comparison with the experimental results of our own critical parameters for the binary refrigerant mixtures, i. e. , the R 12(dichlorodifluoromethane; CCl//2F//2) plus R 22 (chlorodifluoromethane; CHClF//2) system, the R 22 plus R 114 (1,2-dichloro-1,1,2,2-tetrafluoroethane; CClF//2CClF//2) system, and the R 13B1 (bromotrifluoromethane; CBrF//3) plus R 114 system. The predictive method by Li for the critical temperature, that by Chueh-Prausnitz for the critical temperature and critical molar volume, that by Kreglewski-Kay for the critical pressure, that by Soave-Redlich-Kwong equation (SRK equation) as well as that by Peng-Robinson equation (PR equation) are discussed. Due to these comparisons, it becomes clear that it is difficult to predict the critical parameters for the binary refrigerant mixtures consistency by the predictive methods ever reported.

  • GENERALIZED REPRESENTATION OF VAPOR-PRESSURE CURVE FOR HALOGENATED HYDROCARBONS.

    M. Ashizawa, Y. Higashi, M. Uematsu, K. Watanabe

    1987.1 

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    The approach to the generalized representation of vapor-pressure curve is discussed on the basis of the experimental data of vapor pressure for eight halogenated hydrocarbons. With respect to the functional form of the generalized representation of vapor-pressure curve, the Pitzer expansion based on the principle of corresponding states with acentric factor was adopted. The coefficients in the representation have been determined by the least squares fitting to the experimental vapor pressure data for eight halogenated hydrocarbons mentioned above. The proposed generalized representation reproduces most of these data within a pressure deviation of plus or minus 1. 0&#37;.

  • CRITICAL LOCUS FOR SEVERAL BINARY MIXTURES OF HALOGENATED HYDROCARBONS.

    Yukihiro Higashi, Masahiko Uematsu, Koichi Watanabe

    1984.12 

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    Measurements of the vapor-liquid coexistence curve in the critical region have been continued by visual observation of the disappearance of the meniscus at the vapor-liquid interface within an optical cell. The experimental results for dichlorodifluoromethane plus chlorodifluoromethane and chlorodifluoromethane plus 1,2-dichlorotetrafluoroethane systems are presented. The critical locus of these systems is illustrated and the composition dependence of the critical parameters is discussed.

  • 放電プラズマ焼結・接合法により作製されたFeSi2系熱電変換モジュールの熱電変換特性

    安野拓也, 宍戸宏典, 田中勝之, 東 之弘, 川原正和, 鴇田正雄

    粉体粉末冶金協会「放電プラズマ焼結」ワークショップ, 2007 

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    Language:Japanese  

    Country:Japan  

  • Thermodynamic Property Measurements of New Refrigerants and Their Mixtures Invited International conference

    Y. Higashi

    International Workshop on Environmental Engineering 2019 (IWEE2019)  2019.6 

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    Language:English  

    Venue:Nago   Country:Japan  

    Other Link: https://www.jsme.or.jp/env/iwee/2019

  • ペルチェ素子を用いた教育用熱電変換実験機の開発

    田中勝之, 東 之弘

    日本エネルギー環境教育学会全国大会  2008.8 

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    Country:Japan  

  • 3成分系混合冷媒の気液平衡測定

    野木貴之, 東 之弘

    平成9年度日本機械学会東北支部いわき地方講演会, 1997 

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    Venue:いわき   Country:Japan  

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  • 2成分系混合冷媒R-12 + R-22系の臨界域における共存曲線の決定

    東 之弘, 岡崎志朗, 高石吉登, 上松公彦, 渡部康一

    日本機械学会, 1981 

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    Country:Japan  

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  • 高出力バッテリー内の冷却システムの研究

    佐々木重行, 東 之弘, 古川 淳

    日本機械学会東北支部第39期秋季講演会, 2003 

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    Venue:郡山   Country:Japan  

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  • 自然冷媒の飽和蒸気圧および標準沸点の測定

    樋口 知, 東 之弘, 佐々木正夫

    平成9年度日本機械学会東北支部いわき地方講演会, 1997 

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    Venue:いわき   Country:Japan  

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  • 炭化水素系混合冷媒の熱物性 -PVT 性質および気液平衡性質-

    粥川洋平, 藤井賢一, 東 之弘, 渡部康一

    平成15年度日本冷凍空調学会学術講演会, 2003 

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    Venue:東京   Country:Japan  

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  • 放電プラズマ焼結・接合法により作製されたFeSi2系熱電変換モジュールの熱電変換特性

    安野拓也, 宍戸宏典, 田中勝之, 東 之弘, 川原正和, 鴇田正雄

    粉体粉末冶金協会「放電プラズマ焼結」ワークショップ, 2007 

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    Country:Japan  

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  • 代替混合冷媒 R-507 および R-404A の表面張力測定

    佐藤佑也, 東 之弘, 岡田昌章

    平成9年度日本機械学会東北支部いわき地方講演会, 1997 

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    Venue:いわき   Country:Japan  

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  • 三次元筐体内における自然対流のシミュレーション

    露木浩二, 五十嵐三武郎, 東 之弘, 田淵清年

    平成9年度日本機械学会東北支部いわき地方講演会, 1997 

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    Venue:いわき   Country:Japan  

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  • フロン系混合冷媒 R-22 + R-114系の臨界域における気液共存曲線の測定

    東 之弘, 上松公彦, 渡部康一

    日本冷凍協会学術講演会, 1984 

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    Country:Japan  

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  • フロン系冷媒R-13B1 の臨界域における気液共存曲線の測定

    東 之弘, 上松公彦, 渡部康一

    日本機械学会, 1982 

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    Language:Japanese  

    Country:Japan  

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  • フロン系冷媒 R-502 の気液共存曲線および臨界定数の決定

    東 之弘, 上松公彦, 渡部康一

    日本機械学会, 1983 

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    Country:Japan  

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  • フロン系冷媒 R-114 の気液共存曲線の測定および臨界定数の決定

    東 之弘, 上松公彦, 渡部康一

    日本機械学会,1984 

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    Language:Japanese  

    Country:Japan  

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  • エタノールの表面張力測定

    小林千恵, 岩崎絵美, 東 之弘, 岡田昌章

    平成15年度日本冷凍空調学会学術講演会, 2003 

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    Language:Japanese  

    Venue:東京   Country:Japan  

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  • R-134a/n-ペンタン系混合冷媒の気液平衡性質の測定

    永村浩之, 東 之弘

    平成9年度日本機械学会東北支部いわき地方講演会, 1997 

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    Venue:いわき   Country:Japan  

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MISC

  • Basic Performance, Optimization, and Safety and Risk Evaluation of Next-Generation Refrigerants and Refrigerating and Air Conditioning Technologies - Final report

    Norihiro INOUE, Shigehiro UEMURA, Kiyoshi SAITO, Yukihiro HIGASHI, Naoya SAKODA, Takahiko MIYAZAKI, Kyaw THU, Hiroyuki MIYAMOTO, Katsuyuki TANAKA, Chieko KONDOU, Yuya KANO, Ryo AKASAKA, Sho FUKUDA, Akio MIYARA, Keishi KARIYA, Akio MIYARA, Keishi KARIYA, Chieko KONDOU, Yufei LIU, Sho FUKUDA, Norihiro INOUE, Daisuke JIGE, Kiyoshi SAITO, Seiichi YAMAGUCHI, Niccolo GIANNETTI, Jongsoo JEONG, Moojoong KIM, Kenji TOJO, Koji ENOKI, Yohei INOUE, Yuichi SEI, Kiyoshi SAITO, Niccolo GIANNETTI, Jongsoo JEONG, Yoichi MIYAOKA, Yuichi SEI, Yukihiro HIGASHI, Eiji HIHARA, Makoto ITO, Shizuo SAITOH, Chaobin DANG, Eiji Hihara, Tomohiko IMAMURA, Hiroumi SHIINA, Yoshiaki TAKAHASHI, Ryo MATSUKI, Tei SABURI, Shiro KUBOTA, Kenji TAKIZAWA, Kenji TAKAICHI, Koji YAMASHITA, Kiyoshi SAITO, Kiyoshi SAITO, Niccolo GIANNETTI, Yoichi MIYAOKA, Kiyoshi SAITO, Niccolo GIANNETTI, Yoichi MIYAOKA, Kiyoshi SAITO, Yoichi MIYAOKA, Kiyoshi SAITO, Yoichi MIYAOKA, Eiji HIHARA, Tatsuya TANI, Ryota HIRATA, Makoto ITO, Shizuo SAITOH, Eiji HIHARA

    2023.1

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    Language:English   Publishing type:Internal/External technical report, pre-print, etc.   Publisher:Japan Society of Refrigerating and Air Conditioning Engineers  

    DOI: 10.60203/ngrfr_en.2023

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    Other Link: https://www.jsrae.or.jp/jsrae/committee/jisedai_R/Final_Report-e.pdf

  • 次世代冷媒・冷凍空調技術の基本性能・最適化・評価手法および安全性・リスク評価 ファイナルレポート

    井上 順広, 上村 茂弘, 齋藤 潔, 東 之弘, 迫田 直也, 宮崎 隆彦, Kyaw Thu, 宮本 泰行, 田中 勝之, 近藤 智恵子, 狩野 祐也, 赤坂 亮, 福田 翔, 宮良 明男, 仮屋 圭史, 宮良 明男, 仮屋 圭史, 近藤 智恵子, 劉 宇飛, 福田 翔, 井上 順広, 地下 大輔, 齋藤 潔, 山口 誠一, ジャンネッティ ニコロ, 鄭 宗秀, 金 武重, 東條 健司, 榎木 光治, 井上洋平, 清 雄一, 齋藤 潔, ジャンネッティ ニコロ, 鄭 宗秀, 宮岡 洋一, 清 雄一, 東 之弘, 飛原 英治, 伊藤 誠, 斎藤 静雄, 党 超鋲, 飛原 英治, 今村 友彦, 椎名 拡海, 高橋 良尭, 松木 亮, 佐分利 禎, 久保田 士郎, 滝澤 賢二, 高市 健二, 山下 浩司, 岸本 哲郎, 西口 章, 上村 茂弘, 上村 茂弘, 齋藤 潔, 齋藤 潔, ジャンネッティ ニコロ, 宮岡 洋一, 齋藤 潔, ジャンネッティ ニコロ, 宮岡 洋一, 齋藤 潔, 宮岡 洋一, 齋藤 潔, 宮岡 洋一, 飛原 英治, 谷 逹也, 平田 亮太, 伊藤 誠, 斎藤 静雄, 飛原 英治

    2023.1

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    Language:Japanese   Publishing type:Internal/External technical report, pre-print, etc.   Publisher:日本冷凍空調学会  

    DOI: 10.60203/ngrfr_ja.2023

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    Other Link: https://www.jsrae.or.jp/committee/jisedai_R/Final_Report-j.pdf

Works

  • 新規代替冷媒の熱物性計測に関する研究

    1997

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Professional Memberships

  • Japan Society of Thermophysical Properties (JSTP)

  • Japan Society of Mechanical Engineers (JSME)

  • Japan Society of Refrigerating and Air Conditioning Engineers (JSRAE)

  • The Heat Transfer Society of Japan (HTSJ)

  • Japan Association of Energy and Environmental Education (JAEEE)

  • International Institute of Refrigeration (IIR)

  • Japan Society of Refrigerating and Air Conditioning Engineers (JSRAE)

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  • The Heat Transfer Society of Japan (HTSJ)

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  • Japan Association of Energy and Environmental Education (JAEEE)

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  • 国際冷凍学会(International Institute of Refrigeration)

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  • Japan Society of Mechanical Engineers (JSME)

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  • Japan Society of Thermophysical Properties (JSTP)

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Academic Activities

  • Screening of academic papers

    Role(s): Peer review

    2021

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:18

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:3

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Screening of academic papers

    Role(s): Peer review

    2020

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:14

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Screening of academic papers

    Role(s): Peer review

    2019

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:10

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Screening of academic papers

    Role(s): Peer review

    2018

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:10

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Screening of academic papers

    Role(s): Peer review

    2017

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:13

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Science and Technology for the Built Environment (STBE) International contribution

    2016.1 - 2017.3

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    Type:Academic society, research group, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2016

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:18

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers:0

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Research Projects

  • An Extended Generalized Hydrogen-bonding Model: Applications to Refrigerants for Refrigeration at Ultra-low temperatures

    Grant number:23K03722  2023.4 - 2026.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    赤坂 亮, 粥川 洋平, 東 之弘

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    Grant type:Scientific research funding

    本研究では,これまでに確立した一般化水素結合モデルを-50℃以下の温度域にまで拡張し超低温用冷媒の高精度状態方程式を開発する.一般化水素結合モデルは微視的な分子構造の違いを考慮することなく巨視的な熱力学的状態量を精度良く再現するものであるが,現状の一般化水素結合モデルは主に空調用冷媒を対象として構成されており,その有効温度下限は-20℃程度である.本研究では,精密に測定された超低温域における熱物性の実測データを用いて有効温度範囲を-80℃付近まで拡張し,次世代超低温用冷媒R-1132aの状態方程式開発に適用する.

    CiNii Research

  • Fundamental Equations of State for Strongly Associated Fluids Based on a Generalized Hydrogen-bonding Model: Application to ISO International Standard Formulations

    Grant number:20K04338  2020 - 2022

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    赤坂 亮, 粥川 洋平, 東 之弘

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    Grant type:Scientific research funding

    初年度(R02年度)は,2名の研究分担者(東,粥川)および1名の研究協力者(McLinden)に飽和蒸気圧,密度および音速の精密測定を依頼するとともに,文献検索等により既存データを収集・評価し,それらのデータを用いた状態方程式の最適化を行う.
    2年目は,一般化水素結合モデルの原型を作成し,このモデルのパラメータを初年度に得られた実測値を用いて最適化する.
    最終年度は状態方程式と一般化水素結合と組み合わせ全体の最適化を行うとともに,熱物性データベースへの組み込みや論文発表等を行う.

    CiNii Research

  • 省エネ化・低温室効果を達成できる次世代冷媒・冷凍空調技術および評価方法の開発

    2018.6

    九州大学(日本) 

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    Authorship:Principal investigator 

    中小型規模冷凍空調機器用冷媒としての次世代冷媒を対象にした、熱物性・伝熱特性・基本サイクル特性の評価研究を、国内の8つの研究機関と連携して、実施する。そしてこの成果を、業界の実用的な安全基準、国際規格化、国際標準化に結びつける。

  • 次世代冷媒を成分とする3成分系混合冷媒の気液臨界点に関する研究

    Grant number:18K03982  2018 - 2020

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 多種流体同時相関法による次世代冷媒向け実用状態方程式の効率的開発手法の提案

    Grant number:15K05849  2015 - 2017

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • リスクから考える電源インフラの評価に関するカリキュラム開発と技術教育への展開

    Grant number:26285201  2014 - 2017

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 新規代替フロン物質探索のためのスクリーニングデータベースの構築

    Grant number:24560240  2012 - 2014

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 地域連携による環境エネルギー教育者の養成

    2008 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 高圧状態におけるアルコール水溶液の表面張力特性の解明

    Grant number:15560189  2003 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 太陽熱エネルギーの資源化を目指したヒートポンプシステムに関する研究

    Grant number:62603028  1987

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

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