Contents - Index
R507A is a blend of R125 / R143a with mass percentages of 50% / 50% and a molar mass of 98.859 kJ/kg. Although this fluid is a mixture, its properties are well-represented by the equation of state developed by Lemmon, as described in:
"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 reference state is selected such that specific enthalpy=200 kJ/kg and specific entropy=1.0 kJ/kg-K for saturated liquid at 0 C. The reference state can be changed with the $Reference directive
Mixtures do not necessarily remain at constant temperature during constant pressure evaporation or condensation. EES will return the bubble point temperature as the temperature corresponding to saturation at x=0 and the dew point temperature corresponding to saturation at x=1 at a specified pressure.
Viscosity values are obtained from the correlation presented in Viscosity of Mixed Refrigerants R404A, R407C, R410A, and R507A, V.Z. Geller, presented at the 8th International Refrigeration Conference at Purdue University, July 25-28, 2000, West Lafayette, IN
Thermal conductivity values are obtained from the following publication.
Geller, Nemzer, and Cheremnykh
"Thermal Conductivity of the Refrigerant Mixtures"
International Journal of Thermophysics, Vol. 22 No. 4 January 2001 pp. 1035-1043
Fluid Property Information