R472A
R472A is a zeotropic mixture consisting of 69 weight% CarbonDioxide, 12% R32, and 19%R134a. It is an A1 refrigerant suitable for ultra-low temperature systems and is considered to be a replacement fluid for R23. It has a molar mass of 50.385 kg/kmol.
Property data for R472A are provided using a Helmholtz mixture model fitted by F-Chart Software using thermodynamic property data generated by REFPROP. The model is applicable for temperatures between 200 K and 640 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.
Transport properties are estimated using a corresponding states approach as suggested in:
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