When household air conditioners are cooling, the heat exchanger (also called heat exchanger) in the outdoor unit is called the condenser, and the heat exchanger in the indoor unit is called the evaporator. The heat release process of the condenser converts the high-temperature and high-pressure gaseous Freon into a low-temperature and high-pressure liquid Freon by exchanging heat with the air outdoors.
The condenser, that is, the outdoor heat exchanger, is the high-pressure equipment of the system during refrigeration (the heating and cooling type is low-pressure equipment in the heating state), and is installed between the compressor exhaust port and the throttling device (capillary tube or electronic expansion valve). The high-temperature and high-pressure gas (freon) discharged from the compressor of the air conditioner enters the condenser and is cooled by heat dissipation through copper pipes and aluminum foil. During the cooling and condensing process, the pressure does not change, the temperature decreases, and the gas is transformed into liquid.
The process of refrigerant change in the condenser can theoretically be regarded as an isothermal process. In fact, it has three functions. One is that the air takes away the superheated part of the high-temperature air-conditioning refrigerant gas sent by the compressor and turns it into a dry saturated vapor; the other is to liquefy at the same saturation temperature; When the air temperature is lower than the condensing temperature, the liquefied refrigerant is further cooled to the same temperature as the surrounding air for cooling.
When we inspect the air conditioner, we mainly check the condenser of the air conditioner, and clean the surface of the condenser. If there is too much dust, it must be cleaned in time and compressed air blowing. When we inspect, we must check the performance of various switches and control components, check the reliability of their performance and whether the air conditioner is lacking in fluorine. If the vehicle's refrigerant is insufficient, it will cause the air conditioner to lose its cooling function..
In addition, attention must be paid to whether the refrigerant leaks. It is also possible to effectively deal with the parts on the surface of the compressor by observing, mainly dealing with the oil stains on the surface of the compressor, hoses and joints in a timely manner.
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