What is refrigerant? What properties should the refrigerant have?

Refrigerants, also known as refrigerants, are refrigerants that are used in refrigeration systems for refrigeration systems. And can play the role of heat transfer.

The function of the refrigerant is mainly through its physical changes in the transfer of heat, it is in the refrigeration system in the continuous cycle, in its evaporation pressure, the liquid refrigeration system can absorb heat evaporation into a gas, and in the condensing pressure. The gaseous refrigerant emits heat and liquefies, and the heat is transferred in the continuous circulatory system, so the refrigerant is essential in the refrigeration system to transfer heat.

In order to be closer to the ideal inverse Carnot cycle from the thermodynamic point of view, the performance of the refrigerant, the heat exchange efficiency of the heat exchange equipment, the heat transfer temperature difference and so on need to have certain requirements to make the refrigeration equipment more economical and reasonable Less energy consumption. At the same time, should consider some of the refrigerant on the atmospheric ozone layer damage, and change the refrigeration methods and refrigeration equipment.

Refrigerants should have the following properties: Refrigerants should have good thermal, physical, chemical and other aspects of the performance, because the ideal refrigerant is not there, but people should try to choose better performance of the refrigerant.

(1) evaporation pressure and condensing pressure is moderate, that is, at room temperature, should have a lower condensing pressure, and refrigerant evaporation pressure is best close to atmospheric pressure. Even higher than the atmospheric pressure, should be used in atmospheric pressure lower boiling point of the material.

(2) The capacity of the unit volume should be large, because the greater the cooling capacity, the required amount of cooling capacity, the smaller the amount of refrigerant circulation, which can reduce the volume of refrigeration equipment.

(3) to facilitate the use of ordinary cooling water or air to condense, that is, the critical temperature of the refrigerant is high.

(4) thermal conductivity, high heat release coefficient, can improve the heat exchange efficiency.

(5) Low solidification temperature under normal pressure.

(6) requires a low density and viscosity of the refrigerant, a small refrigerant density can reduce the diameter of the pipe, but also reduce the power consumption of the compressor.

(7) has a more stable chemical properties, at any temperature should not be decomposed or combined, no corrosion of the pipeline, the lubricating oil should not be a chemical reaction, the solubility of lubricating oil should be appropriate. Infinite dissolution can reduce the amount of cooling.

(8) should be non-toxic to people, no stimulation, not easy to burn explosion.