What is the function of the evaporator in a car's air conditioning system?
1 Answers
The function of the car air conditioning evaporator is to evaporate the low-pressure refrigerant coming from the expansion valve, absorbing heat from the air inside the car, thereby achieving the purpose of cooling the interior. Here are some relevant details: 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 changes into a gaseous state under low-pressure conditions. This transformation process absorbs heat, making the evaporator cold. When air passes through it, it becomes cool air, achieving the cooling effect. 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 use several types, with tube-belt evaporators being the most common. 3. The refrigerant channels in the air conditioning evaporator are formed by two aluminum plates stamped into complex shapes, layered together to create a sandwich structure. Between each pair of plates, corrugated heat dissipation strips are placed, and then the layers are stacked one by one. 4. The air conditioning evaporator is located inside the evaporator box, which is typically situated in the middle of the dashboard. It is connected by high-pressure and low-pressure pipes, and it's important to ensure the sealing rings are properly installed. The evaporator has a long service life and can generally be used until the car is scrapped.
