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What is the Role of Automotive Air-conditioning Evaporator?

Feb. 22, 2020

Automobile air conditioner evaporator is installed in the evaporation box. The role of the evaporator is to change the refrigerant from a liquid state to a gaseous state (that is, to evaporate) to absorb heat. The evaporator is a device in which a row of curved pipes is covered with metal sheets for heat dissipation, thereby realizing 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 to condense from a gaseous state to a liquid state.


The automobile air-conditioning refrigeration system consists of a compressor, a condenser, a liquid storage dryer, an expansion valve, an evaporator, and a blower. The evaporator is a row of curved pipes covered with metal foil for heat dissipation, so as to achieve outside air. Device for heat exchange with the substance in the pipe. The evaporator is a heat exchange container of the automobile air conditioning system. The evaporator is hidden in the evaporation box and is generally not easy to find. Under normal circumstances, the surface temperature of the evaporator is very low, but only a large amount of dew condensation cannot frost or freeze.


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. The Ford Focus AC Condenser Supplier will give you a detailed introduction.


 VOLVO S80 Auto AC Evaporator


VOLVO S80 Auto AC Evaporator


When the refrigeration system is working, the refrigerant circulates in this closed system in different states. 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 role of automotive evaporator introduced by VOLVO S80 Auto AC Evaporator supplier.

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