EQUATIONS FOR REFRIGERANT R134a VISCOSITY AND THERMAL CONDUCTIVITY CALCULATION

Equations for alternative refrigerant R134a viscosity and thermal conductivity calculation expressed in terms of independent variables, such as temperature and density are worked out. Equation coefficients are determined by the least square technique according to the experimental data. The equations describe viscosity at temperature ranging from 248 to 439 K at a pressure up to 6,0 MPa and thermal conductivity at temperature ranging from 248 to 533 K at a pressure up to 60,9 MPa. The composed equations accuracy is quite acceptable for the engineering calculations.