In recent years, plate heat exchanger technology has become more and more mature. It is characterized by high heat transfer efficiency, small volume, light weight, low dirt coefficient, convenient disassembly, variety of plates and wide application range.Improving the efficiency of plate heat exchangers is a comprehensive economic benefit problem, which should be determined through technical and economic comparison.
The design thickness of the plate is independent of its corrosion resistance and is related to the pressure bearing capacity of the heat exchanger.The plate is thickened to increase the pressure bearing capacity of the heat exchanger.When the herringbone plate is combined, the adjacent plates are inverted with each other, and the corrugations are in contact with each other, forming a fulcrum with a large density and a uniform distribution.The corner hole and edge sealing structure of the plate have been gradually improved, so that the heat exchanger has a good pressure bearing capacity. The maximum pressure capacity of domestic detachable plate heat exchangers has reached 2.5 MPa.The thickness of the plate has a great influence on the heat transfer coefficient, and the thickness is reduced by 0.1 mm. The total heat transfer coefficient of the symmetrical plate heat exchanger is increased by about 600 W/m.K, and the non-symmetric type is increased by about 500 W/m.K.Under the premise of satisfying the pressure bearing capacity of the heat exchanger, the smaller plate thickness should be selected as less as possible.