R475A
R475A is a zeotropic mixture consisting of 45 weight% R1234yf, 43% R134a, and 12% R1234ze(E). It is an A1 refrigerant designed for medium-temperature refrigeration and air conditioning (AC) applications. It can be considered as a replacement for R134a and R404A It has a molar mass of 108.55 kg/kmol.
Property data for R475A 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 160 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.
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