What are the main refrigerants used in air conditioning?

Air conditioning refrigerant composition

Refrigerant Some people also write refrigerants.

Ammonia, Freon and hydrocarbons are widely used in compressed refrigerants. Refrigerant can be divided into five categories according to chemical composition: inorganic compound refrigerant, Freon, saturated hydrocarbon refrigerant, unsaturated hydrocarbon refrigerant and boiling mixture refrigerant. 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 are used earlier, such as ammonia (NH3), water (H2O), air, carbon dioxide (CO2) and sulfur dioxide (SO2). For inorganic compound refrigerants, the international code is R and the last three digits, in which the first digit is "7" and the last two digits are molecular weight. Such as water R7 18 ...

Freon (halohydrocarbon refrigerant): Freon is the general name of all or part of the derivatives of saturated hydrocarbon substituted by hydrogen (CL), fluorine (F) and bromine (Br). International regulations use "R" as the code name of this kind of refrigerant, such as R22 ... Some people call it Freon.

Saturated hydrocarbon refrigerants: These refrigerants mainly include methane, ethane, propane, butane and cyclic organic compounds. The code name is "R" like Freon. This refrigerant is flammable and explosive, and its safety is very poor. Such as R50, R 170, R290, etc.

Unsaturated hydrocarbon refrigerants: these refrigerants are mainly ethylene (C2H4), propylene (C3H6) and their halogen derivatives, and the numbers after R are mostly "1", such as R 1 13 and R1kloc-0/50. ...

* * * Boiling mixture refrigerant: This refrigerant is a * * * boiling mixture composed of two or more different refrigerants in a certain proportion. This refrigerant can maintain a certain evaporation temperature under a certain pressure, and its gas phase or liquid phase always maintains the same composition ratio, but their thermal properties are different from those before mixing. Using * * * boiling mixture can improve the characteristics of refrigerant. Such as R500, R502 ... and so on.

According to the standard evaporation temperature of refrigerants and the condensation pressure at room temperature, high temperature, medium temperature and low temperature refrigerants are classified.