The car air conditioner is a very important configurati […]
The car air conditioner is a very important configuration in the car, which plays a very important role in improving the comfort of the car. At present, both car air conditioners and household air conditioners are composed of compressors, condensers, evaporators, four-way valves, and one-way valve capillary components. Air conditioners are divided into single-cold air conditioners and dual-purpose air conditioners, and the working principle is the same. The principle of refrigeration is that the liquid vaporization refrigeration cycle is composed of four processes: working fluid vaporization, steam boosting, high-pressure steam condensation, and high-pressure liquid depressurization. The heating principle is that the low-pressure gas sucked in by the compressor becomes high-temperature and high-pressure gas after being compressed by the compressor.
When the refrigeration system is working, the refrigerant circulates in this closed system in different states. Each cycle has four basic processes: 1. Compression process: the compressor sucks the low-temperature and low-pressure refrigerant gas at the outlet of the evaporator and removes it. The gas compressed into high temperature and high pressure is discharged from the compressor. 2. Heat dissipation process: The superheated refrigerant gas of high temperature and high pressure enters the condenser. Due to the decrease of pressure and temperature, the refrigerant gas condenses into liquid and discharges a large amount of heat. 3. Throttle process: The refrigerant liquid with higher temperature and pressure becomes larger after passing through the expansion device, and the pressure and temperature drop sharply, and it is discharged from the expansion device in the form of mist (fine droplets). 4. Heat absorption process: The mist refrigerant liquid enters the evaporator, so the boiling point of the refrigerant is much lower than the temperature in the evaporator, so the refrigerant liquid evaporates into a gas. In the evaporation process, a large amount of surrounding heat is absorbed, and then the low-temperature and low-pressure refrigerant vapor enters the compressor. This process goes on again and again to achieve the purpose of reducing the air temperature around the evaporator.
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