Plate heat exchangers are mainly used for air heat exchange in the industrial ventilation industry to achieve functions such as air preheating, cooling, or energy recovery in ventilation systems. The following are their solutions and technical principles:

Solution
Air air heat exchange: In some industrial places, such as large factories and workshops, it is necessary to preheat or cool the fresh air in the ventilation system. Plate heat exchangers can exchange heat between the discharged hot or cold air and the incoming fresh air, allowing the fresh air to reach a certain temperature before entering the room, thereby saving energy and improving the comfort of the indoor environment.
Energy recovery: For some industrial processes that generate a large amount of waste heat, such as metallurgy, chemical industry, etc., plate heat exchangers can be used to recover heat energy from exhaust gas and transfer it to fresh air or other media that need to be heated in the ventilation system. For example, high-temperature exhaust gas is heat exchanged with air in the ventilation system through a plate heat exchanger, and the air is heated and used for heating or other process in the workshop.
Technical principles
Structure and heat transfer method: Plate heat exchangers are composed of a series of metal plates with corrugated shapes, forming narrow channels between the plates. Cold and hot fluids flow in adjacent channels. When hot and cold fluids pass through a plate, heat is transferred through the plate. Due to the large surface area and good thermal conductivity of the plate, efficient heat exchange can occur between the hot and cold fluids.