Thermodynamic Properties Measurement of Binary HFC32 + CF3I Refrigerant Mixtures

摘要

Trifluoroiodomethane (CF_3I) is a low-GWP with A1 classification for flammability. Adding CF_3I to refrigerantmixtures of hydrofluoroolefins (HFOs) and hydrofluorocarbons (HFCs) can suppress the flammability of themixtures which are considered as new alternative refrigerants. In this study, PvTx properties of the binarymixture of HFC32 (difluoromethane) and CF3I were measured for two compositions (HFC32/CF3I with 50/50mass% and 21/79 mass%) using the isochoric method. Measurements were conducted for temperatures rangingfrom 310 to 400 K and pressures up to 6.6 Mpa along 12 isochores between 68 and 1448 kg m~（-3）. Saturateddensities and critical parameters of the selected compositions were determined by the visual observation of themeniscus disappearance and the intensity of the critical opalescence. In addition, the measured vapor-liquidequilibrium data for HFC32 + CF_3I mixtures were compared with an equation of state from 263 to 323 K.