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R450A is a zeotropic mixture consisting of 58 weight% R134a and 42% R1234ze(E) . It has a molar mass of 108.67 kg/kmol. Although it is a mixture, R450A exhibits a small temperature glide between saturated liquid and vapor and therefore can be modeled as a pseudo-pure fluid in the manner described by
"Pseudo-Pure Fluid Equations of State for the Refrigerant Blends R-410A, R-404A,R-507A, and R-407C"
International Journal of Thermophysics, Vol. 24, No. 4, July 2003
The model provided by EES was generated by fitting mixture data from the REFPROP program to a fundamental equation of state for a pure fluid to a fundamental equation of state with separate correlations for the bubble and dew point pressures. The model is applicable for temperatures between 240 K and 420 K with pressures up to 50 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.
Only limited transport property could be found, but based on what was available, it was judged that the transport properties of R450A are similar to those for R513A at the same temperature and pressure.
Fluid Property Information