Measurements of Thermodynamic Properties for R1123 and R1123+R32 Mixture

Measurements of PT and PTx properties, vapor pressures, saturated densities and critical parameters were carried out for a new low GWP refrigerant R1123(trifluoroethylene; CF2=CHF) and its binary mixture of R1123 + R32 system. Sixty-three PT property data and 13 vapor-pressure data for R1123 were obtained in the temperatures between 300 K and 430 K, pressures up to 6.9 MPa, and densities between 100 kg·m and 900 kg·m along 7 isochores. Twenty-one saturated densities for R1123 were obtained in the temperatures between 316.32 K and 331.73 K and densities between 222 kg·m and 880 kg/m. On the basis of these measurements, the correlation of vapor pressures was proposed. Moreover, the critical parameters for R1123 were determined as Tc = 331.73 K, c = 504 kg·m, and Pc = 4546 kPa. As for the binary R1123 + R32 mixture, the same kinds of measurements were carried out for the 40 mass% R1123 mixture and 60 mass% R1123 mixture. The composition dependence of the critical parameters for this mixture was also discussed.