What refrigerant is used in automobile air conditioning?

Commonly used refrigerants for automobile air conditioning are: Freon-12, R 134A and natural refrigerants. The following is the introduction of air conditioning refrigerants: 1. Refrigerant for air conditioning: Refrigerant, also known as refrigerant working medium, is the working medium of refrigeration cycle, which uses the phase change of refrigerant to transfer heat, that is, refrigerant absorbs heat when it vaporizes in evaporator and releases heat when it condenses in condenser; 2. Materials for making refrigerants: At present, there are more than 80 kinds of substances that can be used as refrigerants. The most commonly used are ammonia, freon, water, etc. The following are the extended data for refrigerants: 1, freon-12 (code: R 12)R 12 is a halogenated alkane, and its scientific name is difluoromethane; It is a medium-pressure and medium-temperature refrigerant widely used in small and medium-sized refrigeration devices in China. It is a colorless, transparent, tasteless, almost non-toxic, non-flammable, non-explosive and very safe refrigerant. 2.R 134A: It is widely used in the initial installation and re-installation of new refrigeration and air-conditioning equipment, and it is the most widely used medium-low temperature environmental protection refrigerant at present; Its main features are: no chlorine atoms; It has good safety performance; The physical properties are close to CFC 12, and it is easier to modify the refrigeration system. The amount of refrigerant with better heat transfer performance than CFC 12 can be greatly reduced.