UNIFIED EQUATIONS OF STATE IN POLYNOMIAL FORM FOR COOLANTS R32 AND R125

Abstract

Unified equations of state for ozone-undestroying refrigerants R32 and R125 in polynomial form by explanation of compressibility factor as double power series of density and temperature was developed. Coefficients of equations where determined on the basis of experimental data on density and heat capacities cv and cs taking into account of Maxwell’s rule. Equations describe with experimental precision thermodynamic properties of R32 and R125 at temperatures from 140 to 433 K and from 180 to 480 K, accordingly, at pressures up to 70 MPa including properties on the saturation curve.