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About the Working Principle of Car Air Conditioners

Mar. 07, 2020

The components of an automobile air-conditioning system are composed of a refrigeration system, a heating system, ventilation and air purification devices, and a control system.


Automotive air conditioners are mainly composed of compressors, electronically controlled clutches, condensers, evaporators, expansion valves, liquid storage dryers, pipes, condensing fans, vacuum solenoid valves, idlers and control systems. Automotive air conditioners are divided into high-pressure pipelines and low-pressure pipelines. The high-pressure side includes the compressor output side, high-pressure pipeline, condenser, liquid storage dryer, and liquid pipeline; the low-pressure side includes the evaporator, accumulator, return line, compressor input side, and compressor oil pool. Liquid storage dryer-is actually a device that stores refrigerant and absorbs moisture and impurities from the refrigerant. On the one hand, it is equivalent to the fuel tank of a car, and replenishes the refrigerant in the space where the refrigerant leaks. On the other hand, it filters out impurities doped in the refrigerant like an air filter. The storage liquid dryer is also filled with a certain amount of silica gel, which plays a role in absorbing water.


VOLVO S80 Auto AC Evaporator


VOLVO S80 Auto AC Evaporator


Condenser and evaporator-although they are called differently, they have similar structures. They are devices in which a row of curved pipes is covered with metal foil for heat dissipation, so as to realize the heat exchange between the outside air and the materials in the pipes. The condensing of a condenser refers to the cooling of the refrigerant in its pipes from a gaseous state to a liquid state. Its principle is similar to the engine's radiator water tank (the only difference is that the water in the water tank has always been liquid), so it is often installed on the front of the car and enjoys the cool breeze from the front with the water tank. In short, where is the condenser cooler so that its heat can be condensed? The evaporator is the opposite of the condenser. It is the place where the refrigerant changes from liquid to gaseous (that is, to evaporate) to absorb heat.


Automobile air-conditioning refrigeration system consists of compressor, condenser, liquid storage dryer, expansion valve, evaporator and blower. The copper (or aluminum) tube and high-pressure rubber tube are connected between each part to form a closed system.


So what is the working principle of car air conditioners? The following VOLVO S80 Auto AC Evaporator supplier will come to tell you.


When the refrigeration system is working, the refrigerant circulates in this closed system in different states, and each cycle has four basic processes:

1. Compression process: The compressor sucks in the low-temperature and low-pressure refrigerant gas at the outlet of the evaporator, and compresses it into high-temperature and high-pressure gas to discharge the compressor.

2. Heat dissipation process: High temperature and high pressure superheated refrigerant gas enters the condenser. Due to the decrease in pressure and temperature, the refrigerant gas condenses into a liquid and discharges a large amount of heat.

3. Throttling process: After the refrigerant liquid with higher temperature and pressure passes through the expansion device, the volume becomes larger, the pressure and temperature decrease sharply, and the mist device (small liquid droplets) exits the expansion device.

4. Heat absorption process: The mist-like refrigerant liquid enters the evaporator, so the boiling point of the refrigerant is far lower than the temperature in the evaporator, so the refrigerant liquid evaporates into a gas. During the evaporation process, a large amount of the surrounding heat is absorbed, and then the low-temperature and low-pressure refrigerant vapor enters the compressor. The above process is carried out repeatedly to achieve the purpose of reducing the air temperature around the evaporator.


The above is the working principle of automotive air conditioners introduced by Ford Focus AC Condenser Supplier.

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