Experimental investigation on vapor-liquid equilibrium for 1,1-difluoroethane(R152a) +trans-1,3,3,3-tetrafluoropropene (R1234ze (E)) binary systems

At present, environmental impact is considered as primary index in refrigerant selection. R1234ze(E) is an environmentally friendly alternative to R22, but it has drawbacks of poor cycling performance and low refrig-erating capacity. R152a has certain flammability though having excellent thermodynamic properties. Therefore, based on their complementary advantages, R1234ze(E) is blended with R152a to be a new mixture. Vapor-liquid equilibrium (VLE) data is the basis of calculating the thermodynamic properties of mixtures. This paper pre-sented the experimental data on the vapor-liquid equilibrium of the binary mixture R152a/R1234ze(E) measured up to 328.15 K for the first time, which was measured by the liquid-phase cycling method. The Peng-Robinson (PR) equation of state (EOS) in conjunction with van der Waals (vdW) mixing rule was used to construct a computational model to correlate the experimental data. The model exhibited a high degree of agreement with the experimental result for binary mixture R152a/R1234ze(E). The maximum average absolute relative devia-tion of pressure (AARDp) and the average absolute deviation of vapor-phase mole fraction (AADy) for the model were 0.34% and 0.003, respectively.

Automated summary

This study presents the experimental data on the vapor-liquid equilibrium of the binary mixture R152a/R1234ze(E) and correlates the experimental data using a computational model, showing a high degree of agreement between the model and experimental results.