Vapor–liquid equilibria for the pure, binary and ternary systems containing HFC32, HFC125 and HFC134a

We measured vapor–liquid equilibria (VLE) for the pure, binary and ternary systems containing difluoromethane (HFC32), pentafluoroethane (HFC125) and 1,1,1,2-tetrafluoroethane (HFC134a). Fitting VLE data obtained to an extended BWR equation of state, binary interaction parameters were determined. Using the binary parameters, we could predict VLE for a ternary system at 333.15 K and 2.43 MPa in excellent agreement. In addition, estimation of coefficients of performance (COP) using the equation of state revealed about 15% energy-saving against HCFC22, when mole fractions of HFC32 and HFC125 are 0.485 and 0.250, respectively.