What is a refrigerant? What properties should the refrigerant have?

　　Refrigerant, also known as refrigerant, is a refrigeration working fluid used in refrigeration cycle systems in refrigeration equipment. And can play a role in heat transfer.

The function of 　　 refrigerant is mainly to transfer heat through the change of its physical state. It circulates continuously in the refrigeration system. Under its evaporation pressure, the liquid refrigeration system can absorb heat and evaporate into a gas. Under condensing pressure. The gaseous refrigerant emits heat and liquefies, and the heat is transferred in the devices of the continuous circulation system. Therefore, the refrigerant is an indispensable working substance that transfers heat in the refrigeration system.

　　 In order to get closer to the ideal reverse Carnot cycle from the perspective of thermal engineering, certain requirements must be imposed on the performance of the refrigerant, the heat exchange efficiency of the heat exchange equipment, and the heat transfer temperature difference to make the cooling The equipment is more economical and reasonable, and consumes less energy. At the same time, the destruction of atmospheric ozone layer by certain refrigerants should be considered, and refrigeration methods and refrigeration equipment should be changed.

　　The refrigerant should have the following properties: the refrigerant should have good thermal, physical, chemical and other properties, because there is no ideal refrigerant, but people should try to choose the better performance Refrigerant.

　　 (1) The evaporating pressure and the condensing pressure are moderate, that is to say, at room temperature, it should have a lower condensing pressure, and the refrigerant evaporating pressure z* should be close to the atmospheric pressure. Even higher than atmospheric pressure, it is advisable to use substances with a lower boiling point under atmospheric pressure.

　　 (2) The refrigeration capacity per unit volume should be large, because the larger the refrigeration capacity, the smaller the circulation of the refrigerant when a certain refrigeration capacity is required, which can reduce the volume of the refrigeration equipment.

　　(3) It is convenient to use general cooling water or air for condensation, that is, the critical temperature of the refrigerant is higher.

　　(4) High thermal conductivity and heat release coefficient, which can improve heat exchange efficiency.

　　(5) Low solidification temperature under normal pressure.

　　(6) The density and viscosity of the refrigerant are required to be small. The low density of the refrigerant can reduce the pipe diameter of the delivery pipe and also reduce the power consumption of the compressor.

　　(7) has relatively stable chemical properties, should not decompose or combine at any temperature, has no corrosion to pipelines, should not chemically react with lubricating oil, and should have moderate solubility to lubricating oil . Infinite dissolution can reduce cooling capacity.

　　(8) It should be non-toxic, non-irritating, and not easy to burn and explode.

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