The development of automobile lightweight technology and the requirements of energy saving and consumption reduction have promoted the 100% aluminum alloying of passenger car air-conditioning heat exchanger sheet. Traditional automotive heat exchangers have always used copper alloys, and automotive radiators use composite aluminum foil instead of copper alloys, which can reduce the mass by 20% to 45%. The average consumption of each aluminum radiator is about 2.8kg of aluminum tape foil. The average consumption of each car air conditioner is about 4kg of aluminum tape foil, of which the consumption of each condenser is 2.5kg, and the consumption of each evaporator is 1.5kg.
The automotive heat exchange system includes components such as condenser, evaporator, water tank radiator, intercooler, heater, oil cooler, etc. Brazing composite aluminum heat exchanger sheet, strip and foil is the core material for the production of automotive heat exchangers. Automobile aluminum heat exchanger is composed of aluminum tubes for cooling water and heat sinks for heat dissipation. Aluminum tubes are generally extruded and drawn from 1xxx and 3xxx series aluminum alloys. The heat dissipation fins are made of composite aluminum foil of 3xxx series, 6xxx series aluminum alloy core material and 4xxx series, 7xxx series aluminum brazing sheet alloy layer.
With the substantial increase in the annual output of automobiles, the demand for aluminum heat exchanger sheet and composite aluminum foils has also continued to increase. Aluminum-in-place copper for automobile air-conditioning heat exchangers can not only reduce the weight of automobiles, but also reduce production costs. Therefore, it is of great significance to produce high-quality and low-cost brazing composite aluminum foils for automotive air conditioners.