Car Air Conditioning Evaporator Coil

Car Air Conditioning Evaporator Coil

High-pressure liquid refrigerant enters the evaporator coil through the expansion valve. The atomization action of the expansion valve transforms the liquid refrigerant into a mist. Under low pressure, the mist transforms into a gaseous state, absorbing a significant amount of heat during this transition. The surface temperature of the evaporator coil then drops. The fan then blows air from inside or outside the vehicle through the evaporator coil, absorbing the heat and delivering cool air into the vehicle interior, achieving cooling.

The evaporator coil is typically located in the air duct system beneath the vehicle's dashboard or in the air box behind the instrument panel. The blower forces air through the evaporator, cooling and dehumidifying the air. Some large passenger vehicles have two evaporators, one mounted at the front and one at the rear.

Material Selection

Tubes: Aluminum tubes are commonly used in passenger cars due to their light weight and low cost. Both all-aluminum laminated and tube-and-belt evaporators are primarily made of aluminum. Large buses often use copper tube and aluminum plate evaporators. Copper tubes have excellent thermal conductivity and can quickly transfer heat from the refrigerant. Fins: Aluminum fins are generally used, which can increase the heat dissipation area, improve heat exchange efficiency, and are light in weight and corrosion-resistant.