A heat exchanger is a device used for heat exchange in ventilation and air conditioning systems. It achieves the transfer of thermal energy through heat conduction between two gas streams, with the aim of improving energy efficiency. This equipment is commonly applied in building, industrial, and vehicle air conditioning systems to facilitate energy recovery and temperature regulation by transferring heat between indoor and outdoor air flows. The heat exchanger helps reduce energy waste, enhance the efficiency of air conditioning systems, and improve indoor air quality by exchanging thermal energy in different seasonal conditions.