Pr Equation Of State To Calculate The Thermodynamic Properties Of Refrigerant And Cycle Performance

In this paper, the main purpose is to study different refrigerants and different refrigeration systems at lower evaporating temperature in ideal cycle . The Peng Robinson cubic equation of state ( PR EOS ) is used to calculate thermodynamic properties of frequently used refrigerants (R12, R22, R502)and prospective alternatives refrigerants (R134a, R152a, R125) and mixed-refrigerants ?The result of using CFC and HFCS refrigerants is contrast to the result of mixed-refrigerants in ideal single -press circle at lower evaporating temperature . At the same time using different pure refrigerants in the ideal four kinds of double-stage circle under the same working condition. This paper offers some performance data calculate with computer program and figures which variation of performances of refrigeration in different refrigerants and circle with evaporating temperature.It shows that it is feasible to calculate thermodynamic properties of refrigerants with Equation of state PR in ideal circle and new refrigerants sfuch as R134a, R152a have not more coefficient of performance(cop) than R22 in single-press circle but still have preferable practical value in freezing refrigeration; the results also demonstrate the importance and need for applying mixed-refrigerant in freezing.