COMPARATIVE ENERGY AND EXERRGY ANALYSIS OF ORC-VCR AND MODIFIED ORC-VCR CYCLE USING DIFFERENT WORKING FLUIDS

Abstract

This study examines the energy and exergy of a solar-powered Organic Rankine Cycle (ORC) that uses the refrigerants R245fa, R602, and R600 as working fluid to generate electricity. The suggested cycle combines a solar-sub system with a heliostat and a central receiver with an ORC. The rate of exergy destruction (irreversibility) in each component of the ORC cycle is calculated to assess the cycle's actual performance as well as the causes and locations of thermodynamic imperfection. Using the first and second law technique, parametrical analysis is used to determine the influence of different operational factors on the performance of the ORC Cycle. The impact of several operating factors including turbine input pressure, turbine back pressure, and condenser temperature on energy and exergy efficiency, as well as irreversibility in ORC components such the heat recovery vapour generator, turbine, condenser, and pump, was investigated. Energy efficiency rises from 9.74 percent to 11.3 percent and exergetic efficiency increases from 10.43 percent to 12.10 percent with an increase in turbine intake pressure (1.58-2.38 MPa). The energy and exergy efficiency drops from 11.62 percent to 9.80 percent and 12.44 percent to 10.44 percent with an increase in turbine back pressure (0.18-0.26 MPa). Using R600, R602, and R245fa, the suggested solar-powered ORC cycle will be beneficial for power generation.