Liquid thermal conductivity of binary mixtures of difluoromethane (R32) and pentafluoroethane (R125)

Tile thermal conductivities of refrigerant mixtures of difluoromethane (R32) and pentalluoroethane I RI25) in the liquid phase are preseInted. The thern3al conductivities were measured with the transient hot-wire method with one bare platinum wire. The experiments were conducted in the temperature range of 233--323 K and in tile pressure range of 2 20 MPa. An empirical equation to describe the thermal conductivity o1 a near-azeotropic mixture. R32 + R 125, is provided based on tile measured 168 thermal conductivity data as a function of temperature and pressure. The dependence of thermal conductivity on tile composition at different temperatures and pressures is also preseInted. The uncertainty of our measurements is estimated to be +2%.