Contents - Index



The thermodynamic properties of the azeotropic refrigerant mixture R502 (48.8% R22, 51.2% R115 by mass) are provided by Martin-Hou equation of state (A.I.Ch.E. Journal, 1:142, 1955).  Fitted parameters are from Downing and Knight, DuPont Technical Bulletin RT-52, 1971.


The reference state is determined by setting specific enthalpy and entropy of saturated liquid to 0.


Range of applicability for transport function correlations:

Gas-phase viscosity:  220 K to 390 K

Liquid-phase viscosity: 200 K to 350 K

Gas-phase thermal conductivity: 225 K to 380 K

Liquid-phase thermal conductivity: 280 K to 320 K



Fluid Property Information