Investigation on the Vapor-Liquid Equilibrium for the Ternary Mixture HFC-32+HFC-125+HFC-161 at Temperatures from 265.15 K to 303.15 K

摘要

The ternary mixture HFC-32 + HFC-125 + HFC-161 was considered as a potential alternative refrigerant to HCFC-22 and HFC-410A for the environmentally friendly and excellent thermodynamic properties. Vapor liquid equilibrium data are necessary for the mixed refrigerant to evaluate its optimal composition and the cycle performance in the refrigeration cycles. On the basis of this, the vapor liquid equilibrium data for the mixture HFC-32 + HFC-125 + HFC-161 were investigated by the experiment. The vapor liquid equilibrium data were correlated with the Peng-Robinson (PR) equation-of-state combined with the LCVM (linear combination of Vidal and Michelsen) mixing rule and the NRTL (nonrandom two liquid) excess free energy model. The correlated results revealed a good agreement with the experimental data. The average value of the absolute relative pressure deviations was 0.9 %, and the average values of the absolute composition deviations (abs (y(1) - y(1,cal)), abs(y(2) - y(2,cal))) were 0.0098 and 0.0105, respectively. The results further suggested that there was no azeotrope for the ternary mixture. In addition, on the basis of the interactive parameters obtained by correlating the ternary mixture, the predictions for the binary mixtures HFC-32 + HFC-161, HFC-32 + HFC-125 and HFC-161 + HFC-125 at temperatures of 283.15 K, 293.15 K were conducted. The predicted results were analyzed and discussed by comparison with experimental data from the literature.