The second type of plate is also divided into herringbone and oblique corrugated types, which use corrugated structures to arrange contact points, allowing the fluid to form turbulent flow at low flow rates, greatly improving the heat dissipation effect.

Plate heat exchanger is a new type of high-efficiency heat exchange equipment, which has the advantages of high heat transfer efficiency, compact structure, small footprint, easy installation, and can be easily combined into any flow form according to different process requirements. Therefore, it is widely used in industrial fields such as petroleum, chemical, metallurgy, machinery, light industry, food, medicine, power, coating, heating, etc. In recent years, it has also been widely used in cooling water, pure water and ultrapure water systems in the microelectronics industry.

Due to the fact that chilled water (refrigerant fluid) and circulating cooling water (working fluid) are not in direct contact, they transfer the heat of the circulating cooling water to the chilled water through heat exchange fins. At this time, the temperature of the higher temperature circulating cooling water decreases to become a low-temperature fluid. When the fluid on both sides of the heat exchange fins is in constant temperature heat transfer,

It includes three processes:

1) The convective heat transfer process in which heat is transferred to the wall of the heat exchanger during the flow of circulating cooling water (working fluid);

2) The thermal conduction process through the heat exchanger;

3) The convective heat transfer from the heat exchanger wall on the other side to the chilled water (refrigerant fluid).