Measurements of Thermal Conductivity and Thermal Diffusivity of Alternative Refrigerants in Liquid Phase with a Transient Short-Hot-Wire Method

摘要

A transient short-hot-wire method has been proposed to simultaneously measure the thermal conductivity and thermal diffusivity of liquids. The method has been applied to the refrigerant HCFC-22, alternative refrigerants HFC-32, HFC-125, HFC-134a and refrigerant mixtures HFC-32/125 [35/65, 50/50 (HFC-410A), 68/32 wt%], HFC-32/125/134a [23/25/52 (HFC-407C) wt%]. From the present study, it is shown that the measured results agree well with the literature values on thermal conductivity and those on thermal diffusivity obtained from NIST's thermophysical property database, REFPROP Ver. 6.0.