Automobile air-conditioning refrigeration system consists of compressor, condenser, liquid storage dryer, expansion valve, evaporator and blower. The copper pipe (or aluminum pipe) and the high-pressure rubber pipe are connected between each part to form a closed system. When the refrigeration system is working, the refrigerant circulates in this closed system in different states, and each cycle has four basic processes:
1. Compression process: The compressor sucks in the low-temperature and low-pressure refrigerant gas at the outlet of the evaporator, and compresses it into high-temperature and high-pressure gas to discharge the compressor.
2. Heat dissipation process: high temperature and high pressure superheated refrigerant gas enters the condenser due to pressure
As the temperature decreases, the refrigerant gas condenses into a liquid and emits 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 mist liquid (small liquid droplets) is discharged out of the expansion device.
4. Heat absorption process: The mist-like refrigerant liquid enters the evaporator, so the boiling point of the refrigerant is far lower than the temperature in the evaporator, so the refrigerant liquid evaporates into a gas. During the evaporation process, a large amount of the surrounding heat is absorbed, and then the low temperature and low pressure refrigerant vapor enters the compressor. The above process is carried out repeatedly to achieve the purpose of reducing the air temperature around the evaporator.
The functions of the automatic air conditioner include automatic temperature and humidity adjustment in the car, automatic control of return and supply modes, and control of the operation mode and ventilation volume. The electronic control unit will make the air-conditioning system run automatically according to the settings made by the driver or passenger through the buttons on the air-conditioning display control panel, and adjust the supply air temperature and speed in a timely manner according to the signals input by various sensors. Keep the air environment in the car in a better condition.
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