Volumetric and thermodynamic properties for pure refrigerants and refrigerant mixtures from cubic equations of state

Volumetric and thermodynamic properties were predicted for three pure hydrofluorocarbons (R32, R125 and R134a) as well as for binary and ternary mixtures of these refrigerants. Three cubic equations of state GEOS3C, SRK and PR were used. A wide comparison with literature experimental data was made. For the binary and ternary refrigerant mixtures, classical van der Waals mixing rules without interaction parameters were used. The GEOS3C equation, with three parameters estimated by matching several points on the saturation curve (vapor pressure and corresponding liquid volumes), compares favorably to other equations in literature, and still is simple enough for applications.