What is the physical working process of air conditioning compressors for electric vehicles

　　What is the physical working process of the air-conditioning compressor of an electric vehicle? From a physical point of view, the four essential components of air conditioning include: evaporator, condenser, compressor and expansion valve. The four-way solenoid valve is a switch for switching between cooling mode and heating mode.

　　The refrigeration mode can be regarded as the air conditioning system. The evaporator is placed in the car interior, allowing the refrigerant to evaporate and absorb heat, taking away the indoor heat; the heat is taken to the outdoors through the circulation pipe, and the condenser will condense this part of the heat to release heat. Way, released into the outdoor air. The refrigerant absorbs heat from the room and becomes a low-pressure gas at room temperature; after being boosted by the compressor, it becomes a high-temperature and high-pressure gas that flows into the outdoor condenser. After a heat release process, the gas condenses into a liquid; a high-pressure liquid flows into the expansion valve and partially vaporizes and absorbs Heat, the refrigerant transforms into low-temperature and low-pressure wet steam; the wet steam enters the evaporator in the car, further vaporizes and absorbs heat, forms room temperature gas, and returns to the compressor.

　　Heating is the inverse process of refrigeration. In a two-way heat pump, it is realized by reversing the solenoid valve. What we see is equivalent to putting the condenser inside the car and the evaporator outside.

　　However, in practical applications, the compression mechanism is rarely used alone. Instead, it borrows other heating equipment to provide a heat source, and then uses the air conditioning system to make the heat flow evenly into the vehicle interior. For example, use PTC electric heating, or use the cooling water of the motor controller to heat.