THERMODYNAMICS ANALYSIS OF COMBINED POWER AND STEAM JET EJECTOR REFRIGERATION CYCLE USING SOLAR HEAT SOURCE

Abstract

Thermodynamic analysis of combined power and steam jet ejector refrigeration cycle using solar heat source using molten salt as the heat transfer fluid is performed. This cycle is an integration of Rankine cycle and steam jet ejector refrigeration cycle which could produce electricity and refrigeration output simultaneously. Both exergy destruction and losses in each component and hence in the overall system are determined to identify the causes and locations of the thermodynamic imperfection. The effects of some influenced parameters like direct normal irradiation (DNI), turbine back pressure, evaporator temperature, condenser temperature have been observed on first and second law performance. It is found that maximum irreversibility occurs in central receiver as 32.4% and second largest irreversibility of 25% occurs in heliostat field. The second law efficiency of the solar driven combined power and steam jet ejector refrigeration cycle is 16% which is much lower than its first law efficiency of 31%. Analysis clearly shows that performance evaluation based on first law analysis is inadequate and hence more meaningful evaluation must include second law analysis.