What is the working principle of automobile air conditioning heating system?

Working principle: Automobile air conditioning system is generally composed of compressor, condenser, liquid storage dryer, expansion valve, evaporation box, air conditioning pipeline, electric control clutch and other components. Among them, the refrigerant in the automobile air conditioner is generally R 134a, which circulates among the components of the air conditioner continuously. The principle of utilization is that when it is compressed and released, its volume expands rapidly and it will absorb a lot of heat energy.

Extended data:

After the compressor starts to work, the low-temperature and low-pressure gaseous refrigerant coming out of the evaporation box flows through the compressor to become high-temperature and high-pressure gaseous refrigerant, then passes through the radiator pipe of the condenser to form high-temperature and high-pressure liquid, and then passes through the liquid storage dryer for dehumidification and drying. When it flows to the expansion valve, the air conditioning pipeline becomes wider, the pressure becomes lower, and the refrigerant becomes a low-temperature and low-pressure liquid, which evaporates when it meets a low-pressure environment and absorbs a lot of heat energy.

When the air in the carriage continuously flows through the evaporation box, the temperature and humidity in the carriage will decrease. After the liquid refrigerant flows through the evaporation box, it becomes low-pressure gas again and is sucked into the compressor for the next cycle.

The heating of automobile air conditioner has nothing to do with A/C, but comes from the heat emitted by the warm air water tank (coolant), which recovers a lot of heat generated during the operation of the engine and radiates it to the compartment, thus achieving the purpose of air conditioning heating.

References:

Baidu encyclopedia of automobile air conditioning system? Baidu encyclopedia of automobile heating system