Viscosity and thermal conductivity of methane, ethane and propane halogenated refrigerants

In the case of the methane and ethane halogenated refrigerants, the examination of the available viscosity and thermal conductivity measurements, allowed the derivation and recommendation of standard equations for these two properties. Hence, equations for the viscosity of refrigerants R32, R124, R125, R134a, R141b, and R152a in the Liquid phase and refrigerants R125, R134a, R142b and R152a in the vapor phase are recommended. In the case of the thermal conductivity, equations for refrigerants R32, R123, R124, R125, R134a, R141b, R132b and R152a in the liquid phase and refrigerants R123, R125, R134a, and R141b in the vapor phase are also recommended. For each refrigerant, the temperature range of application and the uncertainty of the equation, is given. These equations together with those previously derived for the Dymond and Assael hard-sphere model for high pressure, form a very useful tool for the engineer. Very few viscosity and thermal conductivity measurements for the propane-halogenated refrigerants exist. Hence, although no recommended equations could yet be derived, a first estimate of the parameters of the Dymond and Assael hard-sphere model could be derived. (C) 2000 Elsevier Science B.V. All rights reserved.