R452B
R452B (also known as DR-55 and Opteon XL55) is a zeotropic mixture consisting of 67 weight% R32, 7% R125 and 26% R1234yf. It has a molar mass of 63.5 kg/kmol. R452B exhibits a small temperature glide between saturated liquid and vapor. It has been modeled as Helmholtz mixture model generated by fitting mixture data from the REFPROP program. The model is applicable for temperatures between 180 K and 420 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 based 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