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Air Conditioner, namely air conditioner, refers to the equipment that manually adjusts and controls the parameters such as temperature, humidity, cleanliness and flow rate of ambient air in buildings/structures. [1] Most of the used refrigerants evaporate or condense under the action of the compressor, which causes the evaporation or condensation of the surrounding air, thus changing the temperature and humidity. Around 1000 BC, Persians had invented an ancient air conditioning system, which used wind poles installed on the roof to blow cold water into the room from the outside to make people feel cool indoors.

/kloc-in the 9th century, Michael Faraday, a British scientist and inventor, discovered that compressing and liquefying a certain gas could freeze the air. This phenomenon appeared when liquid ammonia evaporated, and his idea was still theoretical at that time. Development of refrigerants

The original air conditioners and refrigerators used toxic gases such as ammonia and methyl chloride. The leakage of this gas will lead to a major accident. Thomas Midgley invented chlorofluorocarbon gas in 1928 and named it Freon. This refrigerant is much safer for human beings, but it is harmful to the atmospheric ozone layer. Freon is the trademark of CFC, HCFC or HFC refrigerants from DuPont, in which the name of each refrigerant also includes a number to indicate the molecular composition of its components (for example, R- 1 1, R- 12, R-22, R- 134). Among them, R-22 HCFC refrigerant, which is widely used in the field of direct evaporative moderate cooling products, will stop being used in newly produced equipment from 20 10 and will be completely stopped in 2020. R- 1 1 and R- 12 have been discontinued in the United States.