The viscosity of the refrigerant should be small, and the viscosity of the refrigerant should be small, reducing the flow resistance of the refrigerant in the system, and reducing the pipe diameter of the refrigeration system is a consumption. The low viscosity can also increase the heat transfer performance of the refrigerant.

The purity of the refrigerant should be high, and the selected refrigerant should be free of insoluble impurities. The refrigerant must have a certain degree of water absorption. When very little water penetrates into the refrigerant, it will cause ice plugs at low temperatures and affect the normal operation of the refrigeration system.

The thermochemical stability of the refrigerant is good, and it is not easy to decompose at high temperature. When the refrigerant is mixed with oil and water, it should not have obvious corrosive effect on metal materials, and the swelling effect on the sealing material of the refrigerator should be as small as possible.

The oil solubility of the refrigerant is completely soluble, slightly soluble and completely insoluble. When the refrigerant and the refrigerating machine oil are completely disintegrated, it can create good conditions for the lubrication of the mechanical parts. It is not easy to form an oil film on the heat exchange surface of the heat exchanger such as the condenser, and the heat transfer effect is excellent. However, the evaporation temperature of the refrigerant will increase, the refrigerating machine oil at low temperatures will decrease, the foam will increase when the refrigerant is boiling, the liquid level in the evaporator will be unstable, and the oil consumption of the refrigerator will increase during operation. The oil return of the system is not easy. When the refrigerant and the refrigerating machine oil are completely unclear, the effect on the evaporation temperature of the refrigeration system is small, but an oil film is easy to form on the heat exchange surface of the heat exchanger, which affects the heat exchange. The advantages and disadvantages of refrigerants that are slightly soluble in oil are between the above two.

The effect of the refrigerant on the coil insulation material is as small as possible. In semi-enclosed and fully enclosed refrigerators, the direct contact of the motor coil of the compressor with the refrigerant and the refrigerating oil not only requires the refrigeration to have good electrical insulation, but also The effect of the refrigerant on the coil insulation material is required to be as small as possible.

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