| Hydrofluorocarbons(HFCs)and Hydrocarbons(HCs)are the main refrigerants currently used.However,the global warming potential(GWP)of most HFCs is relatively high,and HCs are flammable and explosive.Hydrofluoroolefins(HFOs)have become a new type of environmental friendly refrigerant because they fully meet the requirements of environmental protection.In this paper,HFO-1336 mzz(Z),HFO-1243 zf,HFO-1234 yf and HFO-1234ze(E)in HFOs are taken as the research objects.Equation of state(EOS)plays an important role in practical applications as an effective tool to solve various thermodynamic relationships.Among these equations of state,the perturbed-chain statistical associating fluid theory(PC-SAFT)and Martin-Hou-81 equation of state(MH-81)have been widely used in the calculation of physical properties.In this paper,the parameters of PC-SAFT equation of state for four working mediums are obtained by regression with pvT data in related literature.On this basis,the PC-SAFT equation of state calculation program of working mediums are compiled by using MATLAB software,and a more comprehensive working medium pvT data is obtained.At the same time,the constant values of MH-81 equation of state for four working fluids were calculated and obtained by MATLAB software,and the pvT data were calculated as the comparison of the results of PC-SAFT equation of state.The results showed that the maximum relative deviation and average relative deviation of pressure calculated by PC-SAFT equation of state were 2.51% and 0.89%,respectively,and the maximum relative deviation and average relative deviation of density were 2.69% and 1.19%,respectively.The maximum and average relative deviations of pressure calculated by MH-81 equation of state were 6.73% and 1.59%,respectively,and the maximum and average relative deviations of density calculated by MH-81 equation of state were 7.68% and 1.98%,respectively. |
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