Contents - Index
R457A is an zeotropic mixture consisting of 70 weight% R1234yf, 18% R32, and 12% R152a. It is considered to be a replacement fluid for R22. It has a molar mass of 87.60 kg/kmol.
Property data for R457A are provided using a generalized equation of state fitted by F-Chart Software using thermodynamic property data generated by REFPROP. The model is applicable for temperatures between 180 K and 420 K with pressures up to 20 MPa. The reference state is saturated liquid at 0 C for which specific enthalpy and entropy are 200 kJ/kg and 1.0 kJ/kg-K, respectively.
The viscosity and thermal conductivity were estimated using the corresponding states approach described the following references with propane as the reference fluid.
Klein, S.A., McLinden, M.O., and Laesecke , A.,
"An improved extended corresponding states method for estimation of viscosity of pure refrigerants and mixtures",
Int. J. of Refrigeration, 20, pp. 208-217, 1997
McLinden et al.,
"An extended corresponding states model for the thermal conductivity of refrigerants and refrigerant mixtures",
Int. J. of Refrigeration, 23, pp. 43-63, 2000
The correlation are valid over the same range of temperature as the equation of state.
Surface tension data were fit to data obtained from the REFPROP.
Fluid Property Information