Contents - Index



The thermodynamic properties of refrigerant R22 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 values of specific enthalpy and entropy are referred to 0 for saturated liquid at -40 C (F).


Range of applicability for transport function correlations:

Gas-phase viscosity:  250 K to 440 K

Liquid-phase viscosity: 170 K to 360 K

Gas-phase thermal conductivity: 230 K to 645 K

Liquid-phase thermal conductivity: 144 K to 340 K


The surface tension function has been fit to data provided by Liley and Desai, "Thermophysical Properties of Refrigerants", ASHRAE, 1993, ISBN 1-1883413-10-9.  It is valid for temperatures between -150 C to 90 C. 


This fluid is provided for backward compatibility.  It is recommended that you us the more accurate property formulation provided by R22.  


Fluid Property Information