what is r22 refrigerant ?
创建于04.28
What is r22 refrigerant ?R22 refrigerant, with the chemical name of dichlorodifluoromethane (CHClF₂), belongs to the category of hydrochlorofluorocarbons (HCFCs) and was once widely used in the refrigeration industry.
Feasures:
- Physical properties: At normal temperature and pressure, r22 refrigerant is a colorless, nearly odorless gas that does not burn, explode, or has low toxicity. It can be liquefied into a colorless and transparent liquid under pressure. Its boiling point is -40.8℃, freezing point is -160℃, critical temperature is 96℃, and critical pressure is 4.99MPa.
- Chemical properties: R22 has stable chemical properties, with good thermal and chemical stability, except that it will crack at high temperatures.
Working principle
In the vapor compression refrigeration cycle, R22 absorbs the heat of the object to be cooled in the evaporator and vaporizes. Then, in the condenser, it transfers the heat to the surrounding medium (air or water) and condenses into a liquid. Through the action of the compressor, the continuous circulation of the refrigerant is completed, thereby achieving the purpose of refrigeration.
Application
In the field of air conditioning: R22 was once one of the most widely used refrigerants in various air conditioning systems, including household and commercial ones.
2. Other refrigeration equipment: R22 is also applied in some small and medium-sized refrigeration units, such as cold storage facilities and refrigerated trucks.
Environmental impact and elimination process
- Environmental impact: R22 refrigerant contains chlorine atoms, which are destructive to the ozone layer and have a relatively high global warming potential (GWP), exacerbating global warming.
- Phase-out process: To protect the ozone layer and address climate change, the international community reached the Montreal Protocol, which requires the phasing out of hydrochlorofluorocarbons. China is also actively promoting the phase-out of R22. Currently, the use of R22 has been basically banned in new refrigeration equipment. R22 is gradually being replaced by environmentally friendly refrigerants such as R410A and R32.
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