MEASUREMENTS OF THE THERMAL-CONDUCTIVITY OF LIQUID R32, R124, R125, AND R141B

This paper reports measurements of the thermal conductivity of refrige rants R32, R124, R125, and R141b in the liquid phase. The measurements , covering a temperature range from 253 to 334 K and pressure up to 20 MPa, have been performed in a transient hotwire instrument employing two anodized tantalum wires. The uncertainty of the present thermal-co nductivity data is estimated to be +/- 0.5%. The experimental data hav e been represented by polynomial functions of temperature and pressure for the purposes of interpolation. A comparison with other recent mea surements is also included.