Cooling domain prediction of HFCs and HCFCs refrigerant with Joule–Thomson coefficient

Abstract

Chlorine refrigerants are considered global warming materials. Chlorinated refrigerants are being replaced with low chlorine content refrigerants, such as HFCs (CH3CF3, CH3CHF2, CH2FCF3, CHF2CF3, CH2F2). Predicting the cooling domain in the operating temperature–pressure range of refrigerants is very important. In this study, the cooling domain for the nonchlorine refrigerants was predicted and compared with the value for chlorine refrigerants, HCFCs (CH3CClF2, CH3CCl2F, CHClFCF3, CHCl2CF3, CHClF2). The cooling domain was depicted with Joule–Thomson coefficient (μJT). The mathematical algorithm of the Joule–Thomson coefficient was derived from the cubic type equation of states, van der Waals (vdW), Redlich–Kwong (RK), Soave–Redlich–Kwong (SRK), Peng–Robinson (PR). Joule–Thomson coefficients had different types with the equation of state. The maximum inversion pressure and corresponding temperature were proposed from each inversion curve. From these results, the refrigeration working domains of the green refrigerants were predicted.