Thermodynamic analysis of a combined power and ejector refrigeration cycle using zeotropic mixtures

摘要

In this paper, a combined power and refrigeration cycle is studied. The proposed cogeneration system consists an organic Rankine cycle and a refrigeration cycle, connected by an ejector. The performance of the combined cycle is analyzed when the system running in different working fluids, including pure working fluids, R245fa and R600a, and zeotropic mixtures, R245fa/R600a. The mass fraction of the mixtures varies from 10/90 to 70/30, and the results show that the mixtures generate more refrigeration than pure working fluids, and they have better performance under certain conditions. Besides, the effect of some thermodynamic parameters, including evaporator temperature, condenser temperature, boiler temperature and turbine outlet temperature, on the performance of the system is studied.