R449A
R449A (also known as Opteon XP40) is a zeotropic mixture consisting of 24.3 weight% R32, 24.7% R125, 25.3% R1234yf and 25.7% R134a. It has a molar mass of 87.2 kg/kmol. R449A exhibits a temperature glide between saturated liquid and vapor. It has been modeled as a pseudo-pure fluid based in the manner described by
E. Lemmon
"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 and from the manufacturer's website to a fundamental equation of state with separate correlations for the bubble and dew point pressures. The model is applicable for temperatures between 180 K and 440 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 were fitted to data provided by the manufacturer's website. Transport properties for gaseous R449A are available for temperatures between 220 K and 450 K. Liquid phase properties are available for temperatures between 233 and 350 K.