Two-Phase and Vapor Phase PvTx Properties of the Difluoromethane + cis-1,3,3,3-Tetrafluoroprop-1-ene Binary System

This paper provides 84 two-phase and 66 vapor phase PvTx measurements for binary blends comprising difluoromethane (R32) and cis-1,3,3,3-tetrafluoroprop-1-ene (R1234ze(Z)). The data are for seven isochores (0.013352, 0.016365, 0.023746, 0.026769, 0.035001, 0.070089, 0.071713) m3·kg-1 for the temperature range from (263 to 373) K for seven R32 mole fractions (0.0871, 0.2980, 0.3620, 0.5232, 0.7128, 0.8015, 0.8973). The flash method coupled with the Peng-Robinson equation of state and a two-parameter cubic equation of state proposed by Stryjek was used to derive the vapor-liquid equilibrium of the R32 (1) + R1234ze(Z) (2) binary pair from the two-phase measurements. The measured properties in the superheated vapor region were correlated through the aforementioned equations of state and a truncated virial equation of state. The PvTx data display good agreement with both the values calculated from the equations of state and from REFPROP 10.0 predictions.