The experimental investigation of the vapour liquid phase equilibrium for (ammonia + 2,3,3,3-tetrafluoroprop-1-ene) system

Searching for mixed alternative refrigerants with less influence on global warming is one of the main tasks of the refrigeration industry. This paper presents the vapour liquid phase equilibrium and vapour liquid liquid phase equilibrium data of (ammonia + 3,3,3-tetrafluoroprop-1-ene) system at temperature from 243.150 K to 283.150 K. The vapour pressures of 3,3,3-tetrafluoroprop-1-ene were compared with Refprop 9.1, and the maximum deviation of pressure is 0.0007 MPa. The VLE and VLLE data were regressed by the PR-MHV2-NRTL model. Good reproduction was shown with the maximum RT = 0.009 K, Rp = 0.0040 MPa, Rx = 0.013 and Ry = 0.013. The homogeneous or heterogeneous azeotropic behaviours were found for the systems concerned over the temperature ranges investigated. The present results suggest that the volumetric refrigeration capacity of (ammonia + 2,3,3,3-tetrafluoroprop-1-ene) azeotropic mixture is 15% higher than that of ammonia and 79% higher than that of 2,3,3,3-tetrafluoroprop-1-ene.