CALCULATION OF 2ND VIRIAL-COEFFICIENTS AND GASEOUS VISCOSITIES OF THEREFRIGERANTS HFC-32 (CH2F2), HFC-23 (CHF3), AND HCFC-22 (CHC1F(2))

The second virial coefficients of refrigerants HFC-32 (CH2F2), HFC-23 (CHF3), and HCFC-22 (CHC1F(2)) have been correlated on the basis of si te-site model potential and have been compared with experimental resul ts. The molecular interactions consisted of repulsion-dispersion and e lectrostatic parts. From the site-site potentials adjusted to the expe rimental second virial coefficients, spherically averaged potentials h ave been determined and a subsequent calculation of gaseous viscosity has been carried out. Agreement between measured and calculated values of second virial coefficients and gaseous viscosity is satisfactory. Calculated values of second virial coefficients and gaseous viscosity beyond available experimental data, therefore, can be assumed as a rel iable extrapolation to lower and higher temperatures.