||Seo Sang Won, Development of an adsorption desalination system upgrading the waste heat, Japan Society of Mechanical Engineers, 2021.04, The global shortage of potable water is becoming significant and crucial for economic stability and world peace. The immediate solution for the water shortage is the conversion of seawater or brackish water to potable one. Thermal desalination systems like multi-effect-distillation (MED), multi-stage-flashing (MSF) and membrane distillation (MD) utilize high-temperature energy, i.e., hot water or steam to produce potable water. These systems downgrade the heat source for the operation. We developed an innovative desalination system where the temperature of the waste heat is upgraded to a higher one to drive the desalination system. Upgrading of the waste heat is achieved using the Adsorption Heat Transformer (AHT) cycle where the heat of adsorption is extracted as the upgraded heat source which is successively utilized for boiling and condensation of the seawater producing the potable water. We will discuss the concept, the inner working and the performance of the new AHT-MED cycle. The performance ratio of the cycle is expected to be in the region of 6 to 7 for a seven-stage system with the heat source temperature to the AHT cycle less than 70° C while conventional MED systems need steam with a temperature above 110° C..