Effects of refrigerant properties on refrigerant performance comparison : A review

The effects of thermo-physical properties and derived parameters of refrigerants on system performance comparison are reviewed here. The properties reviewed are density, viscosity, thermal conductivity, molar heat capacity, critical temperatures, specific refrigerating effect and molecular weight. It was noted that to obtain a high COP, combinations of high values of latent heat, liquid thermal conductivity and vapour density and low values of liquid viscosities and molecular weight are required. Critical temperature and vapour specific heat are important properties when considering trade-offs between capacity and COP. The oil existance in the system could reduce or increase heat transfer or/and pressure drop comparing to those ignore the presence of oil depending on the amount of oil and solubility.

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