Analysis of Exergy Change During Compression Process of a VCR Cycle Using R 134 a as Refrigerant

In this study, analysis of the first and second law of thermodynamics is carried out for compression process of a vapor compression refrigeration cycle using the properties of refrigerant R 134a, a refrigerant with 0.055 ODP compared to ODP value of R11 an another traditional refrigerants containing chlorine as 1. The study was carried out with the starting point as the exit of an evaporator assuming that the refrigerant leaves the evaporator as saturated vapour and compressed to some superheated temperature. Various values of change in exergy during the compression process calculated for various temperatures beyond saturation temperature at the elevated pressure ie in the superheated vapour region at different pressures and plotted to built a mathematical model to calculate either one by just knowing the value of the other. A relationship is established between the degree of superheat at the end of the compression to the exergy destruction at various pressures during entire compression process.