Experimental measurement of vapor-liquid equilibrium for 3,3,3-trifluoropropene(R1243zf) + 1,1,1,2-tetrafluoroethane(R134a) at temperatures from 243.150 to 293.150 K

New regulations have been approved that only low-GWP refrigerants will be used in developed countries. As mixed refrigerants especially positive azeotropic blends, R1243zf could be a promising substitute component for R134a with similar thermodynamic properties and low GWP. In this study, the VLE data for the binary system of R1243zf + R134a were measured with a recirculation method at six temperatures (243.150, 253.150, 263.150, 273.150, 283.150 and 293.150) K. The measurement uncertainties of the temperatures, pressures and compositions are estimated to be less than 5mK, 800 Pa, 0.005, respectively. All the experimental data were correlated by PR-vdW and PR-HV-NRTL model. The maximum average absolute relative deviation of pressure (AARDp) and average absolute deviation of vapor-phase mole fraction (AADy) for the PR-vdW model are 0.35% and 0.004, respectively, while the maximum AARDp and AADy for PR-HV-NRTL model are 0.29% and 0.004, respectively. Positive azeotropic behavior was exhibited at each temperature investigated. © 2020