Kyushu University Academic Staff Educational and Research Activities Database
List of Books
SAEID JALILINASRABADY Last modified date:2022.06.28

Associate Professor / Department of Earth Resources Engineering / Faculty of Engineering

1. Saeid Jalilinasrabady, Saeid Jalilinasrabady, Iceland, Geothermal District Heating and Swimming Pool in the Sabalan area - Iran, ISBN 9979-68-165-9, UNU-GTP report, pp. 99-130, 2004., 2004.12, [URL], The Sabalan geothermal area in NW-Iran is potentially an important place for tourism in Iran. After realising the plans for building the first geothermal electric power plant in this region and developing swimming pools, using the geothermal
water available in this area, hopefully it will be more attractive for tourists and also provide good sanitation facilities for the local people. According to calculations described in the report, Gheynarjeh hot spring has been found to be suitable as a heat source for a swimming pool, both with regard to the required temperature and flow rate. The report also describes the design of a district heating system for Moeil village. The heat load for one sample building was calculated. Comparison of mass flow for a geothermal and fuel-fired system was done, and the influence of radiator size on indoor temperature was analyzed based on a steady-state model. In addition to this, a district heating network was designed and calculations done for it. The simulation results are reasonable and provide a good starting point for a
real project. .
2. Saeid Jalilinasrabady, Saeid Jalilinasrabady, Iceland, Open Heat Exchanger for Improved Energy Efficiency in the Heating of Hot Spas, ISBN 978-9979-68-250-9, ISSN 1670-7427, p. 56, December 2008., 2008.10, [URL], Hot spas and Jacuzzis are popular in Iceland due to the abundance of reasonably prized geothermal heat available. However the water from the district heating system is too warm to be admitted directly into the spa. For safety reasons the water is mixed with cold water, from 75 down to 50ºC, which leads to wasting a large quantity of heat. Therefore a design was suggested that enables the feeding of geothermal water directly into the pot, omitting the step of mixing it with cold water. The idea is to employ an open heat exchanger that transfers much heat from the geothermal water to the bulk water in the spa, before letting it mix with the spa water. A case study was done for one particular spa. Heat load was calculated and measured when the spa was in use, and when it was unused. A design is suggested employing a circular double-plate which is to be placed at bottom of pot. This unit will function as an open heat exchanger feeding district heating water into the pot. Free convection takes place at the up side of the upper plate and forced convection below the upper plate. Heat transfer coefficient for both was calculated. Temperature field in the pool before and after implementation of the open heat exchanger was measured at different points using thermocouples. The measured temperatures were compared to thermal and fluid-dynamic simulation of the temperature and flow fields obtaining good accordance. Results are reasonable and promising for a good design that may
considerably reduce the energy expenses for a continuously heated geothermal spa. More detailed measurements were made on the upper plate of the heat exchanger and detailed simulation of the heat exchanger itself was then used to obtain a value for the heat transfer coefficient for the upper plate to the surrounding water. This information was used to make an improved design for the open plate heat exchanger, stating that a diameter of 63 cm and a thickness of 1.5 cm were suggested as final design. Due to economy consideration the recovery time of the implementing of suggested heat exchanger is estimated to 8 months in studied case..