Car air conditioning working principle
The automotive air conditioning refrigeration system consists of a compressor, a condenser, a receiver drier, an expansion valve, an evaporator, and a blower. Copper pipes (or aluminum pipes) and high-pressure rubber pipes are connected between the components to form a closed system. When the refrigeration system is working, the refrigerant circulates in this closed system in different states. There are four basic processes in each cycle:
1. Compression process: The compressor sucks into the low-temperature and low-pressure refrigerant gas at the outlet of the evaporator, and compresses it into a high-temperature and high-pressure gas to discharge the compressor.
2. Heat dissipation process: The high temperature and high pressure superheated refrigerant gas enters the condenser. Due to the pressure and temperature decrease, the refrigerant gas condenses into a liquid and discharges a large amount of heat.
3. Throttling process: After the refrigerant liquid with higher temperature and pressure passes through the expansion device, the volume becomes larger, the pressure and temperature drop sharply, and the expansion device is discharged in the form of a mist (fine droplets).
4. Endothermic process: The misty refrigerant liquid enters the evaporator, so the boiling point of the refrigerant is much lower than the temperature inside the evaporator, so the refrigerant liquid evaporates into a gas. The surrounding heat is absorbed in a large amount during the evaporation process, and then the low-temperature low-pressure refrigerant vapor enters the compressor again. The above process is carried out repeatedly to achieve the purpose of reducing the temperature of the air around the evaporator.