The specific working principle of automobile air conditioning cooling and heating?

Automotive air conditioning refrigeration principle:

Automotive air conditioning work, the refrigeration system of low pressure, low temperature refrigerant vapors by the compressor suction and compression for high-pressure, high temperature superheated vapors discharged to the condenser. At the same time the car outside the fan inhalation of the external air flow through the condenser, take away the heat released by the refrigerant, so that high pressure, high temperature refrigerant vapor into high pressure liquid.

The high-pressure liquid flows into the evaporator through the throttle (expansion valve) to reduce pressure and temperature, and evaporates under the corresponding pressure, absorbing the surrounding heat, while the fan on the inside of the car makes the air inside the car continuously enter the fins of the evaporator for heat exchange, and sends the exothermic cooled gas to the inside of the car. This way, the indoor and outdoor air is constantly circulating to achieve the purpose of lowering the temperature.

Automobile air conditioning heating principle:

Automobile air conditioning heating system, the heat is not generated by the air conditioning system, but by the engine coolant. After the engine is started, due to the non-stop operation of the work done, in the process of operation to produce a large amount of heat, this part of the heat by the engine coolant quickly absorbed to achieve the purpose of cooling the engine.

If the air conditioning temperature selector lever is selected in the heating position, then the heat exchanger and the engine cooling water tank is connected, the heat exchanger will be part of the engine after absorbing the heat of the high-temperature coolant introduced into the compartment, the compartment of the air under the action of the blower constantly flow through the heat exchanger, so that the coolant flowing through the heat exchanger non-stop heat exchange, so as to achieve the purpose of heating.

Expanded information:

Classification of automotive air conditioning:

1, according to the drive mode

Sub-independent: dedicated an engine-driven compressor, cooling capacity, stable work, but high cost, volume and weight, mostly used in large and medium-sized buses.

Non-independent: air-conditioning compressor driven by the car engine, refrigeration performance by the engine work has a greater impact on the stability of the poor, mostly used in small buses and cars.

2, according to the air conditioning performance

Single-function type: cooling, heating, ventilation systems are installed separately, separate operation, do not interfere with each other, mostly used in large buses and trucks.

Cooling and heating integrated: cooling, heating, ventilation **** with the blower and air ducts, in the same control board for control, the work can be divided into cold and warm wind work separately and cold and warm wind can work at the same time mixed thermostat type. Sedan mostly use the mixed thermostat type.

3, according to the control mode

Manual: toggle the function keys on the control panel to control the temperature, wind speed, wind direction.

Electrically controlled pneumatic adjustment: the use of vacuum control mechanism, elected air conditioning function keys, it will be able to automatically control the temperature and air volume within a predetermined temperature.

4, according to the adjustment mode

Full-automatic regulation: the use of computational comparison circuit, through the sensor signal and pre-conditioning signals to control the regulating mechanism work, automatic adjustment of temperature and air volume.

Full-automatic regulation controlled by microcomputer: taking microcomputer as the control center, realizing all-round and multi-functional optimal control and regulation of the air environment in the car.

Baidu Encyclopedia - Automotive Air Conditioning