What is the function of the evaporator in a car air conditioning refrigeration system?
2 Answers
Car air conditioning evaporators are effective in cooling the interior of the vehicle. Below is more information about interior cooling: 1. The evaporator is a heat exchanger. High-pressure liquid refrigerant enters the evaporator through the expansion valve. Due to the atomization effect of the expansion valve, the liquid refrigerant turns into a mist, which then transforms into a gaseous state under low-pressure conditions. During this transformation process, heat is absorbed, making the evaporator very cold. When air passes through it, it turns into cool air, achieving the purpose of refrigeration. 2. Evaporators come in tube-fin, tube-belt, and laminated types. Currently, passenger cars in China mainly use all-aluminum laminated and tube-belt evaporators, while large buses primarily use copper tube-aluminum fin evaporators. Medium-sized buses may use any of these types, with tube-belt being the most common. The refrigerant channels in air conditioning heat dissipation evaporators are formed by two aluminum plates stamped into complex shapes, layered together to create sandwich plates that form the refrigerant channels. Between every two sandwich plates, corrugated heat dissipation strips are placed, and these layers are stacked together, providing excellent heat dissipation effects. 3. The air conditioning evaporator is located inside the evaporator box, which is inside the dashboard, usually in the middle of the dashboard. It is connected by nothing more than high-pressure and low-pressure pipes. It is important to ensure that the sealing rings are properly installed. The evaporator has a long service life and can generally last until the car is scrapped.
As a long-distance driver, I know all too well the importance of the evaporator. It's like the 'heat-absorbing workhorse' of the AC system, silently working behind the dashboard. When liquid refrigerant flows through the evaporator's intricate tubes, it instantly absorbs heat from the surrounding air—just like how spraying alcohol on your skin gives you that chilly sensation. The cooled air is then blown out by the blower, making the cabin comfortably cool. I remember one summer when my car's AC suddenly started blowing hot air. At the repair shop, they opened it up and found the evaporator surface clogged with poplar fuzz—cleaning it immediately restored cooling. That's why regularly changing the cabin air filter is crucial; otherwise, dust blocking the evaporator fins will significantly reduce cooling efficiency.
