R480A
R480A (also known as RS-20 is a zeotropic mixture consisting of 5 weight% CO2, 86% R1234ze(E) and 9% R227ea. It is considered to be a drop-in replacement fluid for R134a. It has a molar mass of 108.6 kg/kmol.
Property data for R480A are provided using a pseudo-pure model fitted by F-Chart Software using thermodynamic property data generated by REFPROP. The model is applicable for temperatures between 170 K and 460 K with reduced densities up to 3. 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