Experiment of evaporation process in a Rankine cycle with a HFC/HFO mixture as working fluid

Abstract

The study investigated an evaporation process of working fluids for organic Rankine cycles that utilized waste heat below 100ºC as a heat source. A water bath was used as an evaporator at constant temperature and the working fluids, which were HFC-245fa and a zeotropic mixture of HFC-245fa and HFO-1234ze(E), flowed in a tube with evaporation. It was observed that a large pressure drop in a tube resulted in the decrease in evaporation temperature in the case of HFC-245fa. On the other hand, the temperature lift of the zeotropic mixture caused a recovery of temperature decrease during the evaporation.