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4.4.4 Second law analysis of the transcritical cycle First law analysis is simple and shows an overall picture for the system performance while second law analysis makes it possible to find out contribution of each component in irreversibility. Second law analysis of the system is therefore done to see how effectively the components are doing their tasks and see which components need to be improved. Following two approaches were utilized in the second law analysis, a. Exergy balance method: to find out exergy destruction in the components. b. Entropy contribution method: to investigate entropy production in the components. Where ho and so are the enthalpy and entropy values at atmospheric temperature of 0 oC. Change of exergy in a component is calculated as, And exergetic efficiency is calculated by, Utilized expressions are summarized in table below and were found from [16] for the calculation of exergy destruction and entropy production in the components. Exergy balance method Entropy balance method Gas cooler Exergy supplied: Exergy recovered: Evaporator Exergy supplied: Exergy recovered: 44PDF Image | heat recovery from R744 based refrigeration system
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