Experimental Study of Thermal Conductivity of R-125/R-134A(39/61) Mixture in Vapor Phase

The coaxial cylinders method was used to measure the thermal conductivity of the R-125/R-134A (39/61) gas mixture. The experiments were carried out in the temperature range of 320–415 K and in the pressure range of 0.1–1.8 MPa. Coefficients were determined for an equation describing the thermal conductivity as a function of pressure and temperature. Thermal conductivity on the dew line and in ideal-gas state was calculated.