A New Fundamental Equation of State for R1123 and its Applications to Mixture Models for Mixtures with R32 and R1234yf

A new fundamental equation of state is presented for trifluoroethene (Rl123). This novel refrigerant is a promising constituent of refrigerant mixtures for use in residential air conditioners due to its zero ozone depletion, ultra-low GWP, and favorable thermophysical properties. Compared to the first equation published in 2016, the new equation of state provides better agreement with experimental data and shows more reasonable extrapolation behavior. Accuracies are improved, particularly in the calculations of the liquid density and vapor pressure. Deviations between experimental data and calculated values are shown for these properties. Changes in the residua! isochoric heat capacities over wide temperatures and pressures are demonstrated to verify the extrapolation behavior. The new equation is also applied to mixture models for mixtures with R32 and R1234yf. Fitted mixing parameters are presented for the Kunz-Wagner model. Isothermal vapor-liquid equilibrium calculated from the model is shown along with experimental data.