What are the classification of air conditioning refrigerant?

Widely used in the compression type refrigerants refrigerants are ammonia and freon and hydrocarbons. Today with friends and * cold bacteria to the refrigerant to detailed classification! 1 according to the chemical composition of refrigerant can be divided into five categories: inorganic compound refrigerants, freon, saturated hydrocarbon refrigerants, unsaturated hydrocarbon refrigerants and azeotropic mixture refrigerants. 2 according to the condensing pressure refrigerant can be divided into three categories: high temperature ( Low pressure) Refrigerant, medium temperature ( Medium voltage) Refrigerant and low temperature ( High pressure) Refrigerants. 3 inorganic compounds refrigerants such refrigerants used early, such as ammonia, NH3) And water ( H2O) , air, carbon dioxide ( CO2) And sulfur dioxide ( SO2) And so on. For inorganic compounds refrigerants, international regulations, code-named 'R' and the back of the three Numbers, * * one for two digits after the '7' for molecular weight. Such as water R718, etc. 4 freon ( Halogen carbon compounds refrigerant) Freon is saturated hydrocarbons (all or part of the hydrogen element in CL) And fluorine ( F) And bromide ( Br) After replace the floorboard of the derivatives. International regulations, use the 'R' as a symbol of this kind of refrigerant, such as R22, etc. Saturated hydrocarbon refrigerants such five major with methane, ethane, propane, butane and cyclic organic compounds, etc. Code with freon as using the 'R', this kind of refrigerant flammable and explosive, * * is very poor. Such as R50, R170, R290, etc. 6 unsaturated hydrocarbon refrigerants such refrigerants are mainly ethylene ( C2H4) , propylene ( C3H6) And their derivatives, halogen elements after they R number is '1', more like R113 and R1150, etc. 7 azeotropic mixture refrigerants such refrigerants is by two or more different refrigerant mixture to a certain percentage of the azeotrope, this kind of refrigerant under certain pressure can keep certain evaporating temperature and the gas phase or liquid phase keep composition ratio remains unchanged, but their thermal properties are different from before mixing material, azeotrope can be used to improve the characteristics of the refrigerant. Such as R500, r114, etc. High temperature, medium temperature and low temperature refrigerant is evaporating temperature and room temperature by the standards of the refrigerant condensing pressure points.

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