Vapor-liquid equilibrium measurements for binary mixtures of R1234yf with R32, R125, and R134a

Vapor-liquid equilibria (VLE) measurement results for three binary refrigerant mixtures of R1234yf with R32, R125, and R134a are presented. The VLE properties were measured at mass fractions of R1234yf from 25% to 80%. Equilibrium pressures were measured at temperatures from 273 K to 333 K at 10 K intervals for each binary refrigerant mixture. Measured data were correlated by using both the Peng-Robinson-type and Helmholtz-type equations of state combined with mixing rules. Binary interaction parameters included in each mixing rule were optimized to fit the measured VLE data of each binary mixture. It was found that the temperature glide of the refrigerant mixture R32/R1234yf was much larger than that of the other binary mixtures. Further, it was found that R134a/R1234yf had an azeotropic property around 50/50 wt%. The measured fundamental data of the vapor-liquid equilibrium are crucial for the optimization of binary refrigerant mixture systems. (C) 2012 Elsevier Ltd and IIR. All lights reserved.