What are the classifications of air-conditioning refrigerants? Almost all covered!

The refrigerants widely used in compression refrigerants are ammonia, freon and hydrocarbons. According to their chemical composition, refrigerants can be divided into five categories: inorganic compound refrigerants, freons, saturated hydrocarbon refrigerants, unsaturated hydrocarbon refrigerants and azeotropic refrigerants. According to the condensation pressure, refrigerants can be divided into three categories: high temperature (low pressure) refrigerants, medium temperature (medium pressure) refrigerants, and low temperature (high pressure) refrigerants.

Inorganic compound refrigerants: These refrigerants were used earlier, such as ammonia (NH3), water (H2O), air, carbon dioxide (CO2) and sulfur dioxide (SO2) Wait. For inorganic compound refrigerants, the internationally prescribed code is R and the following three digits, where the first digit is '7' and the last two digits are the molecular weight. Such as water R718...etc.

Freon (halocarbon refrigerant): Freon is all or part of hydrogen (CL), fluorine (F) and bromine (Br) in saturated hydrocarbons The general term for derivatives after replacement. International regulations use 'R' as the code name for this type of refrigerant, such as R22...etc.

Saturated hydrocarbons: This type of refrigerant mainly includes methane, ethane, propane, butane and cyclic organic compounds. The code name uses 'R' like Freon. This kind of refrigerant is flammable and explosive, and its safety is very poor. Such as R50, R170, R290...etc.

Unsaturated hydrocarbon refrigerants: these refrigerants are mainly ethylene (C2H4), propylene (C3H6) and their halogen derivatives, and their R The number after is mostly '1

Azeotropic mixture refrigerant: This type of refrigerant is an azeotropic mixture formed by mixing two or more different refrigerants in a certain ratio. This type of refrigerant is at a certain pressure It can maintain a certain evaporating temperature, and its gas or liquid phase always keeps the composition ratio unchanged, but their thermal properties are different from those before mixing. The use of azeotropic mixtures can improve the characteristics of refrigerants. Such as R500, R502...etc.

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