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