The process of the plate heat exchanger is assembled by many plates according to a certain process and technical work requirements of the buyer. The four corner holes of the mesh channel are formed between the plates to form the distribution pipe and the confluence pipe. The gasket seals the hot and cold media in the heat exchanger, while reasonably separating the cold and hot media without mixing. In the channel, the hot and cold fluid flows at intervals, which can be countercurrent or downstream. During the flow, the hot and cold fluids exchange heat through the plate wall. There are many process combinations of plate heat exchangers, all of which are realized by using different reversing plates and different assemblies. The process combinations can be divided into single process, multiple processes, vapor-liquid exchange processes, and mixed process forms.
The process combination form should be calculated based on heat exchange and fluid resistance, and determined under the requirements of process conditions. Try to make the convective heat transfer coefficients in the cold and hot water channels equal or close to each other to get the best heat transfer effect. Because the convective heat transfer coefficient on both sides of the heat transfer surface is equal or close to the heat transfer coefficient to obtain a larger value. Although the flow velocity between the plates of the plate heat exchanger is not equal, the average flow velocity is still used in the calculation of heat exchange and fluid resistance. Because the "U"-shaped single-flow pipes are fixed on the compression plate, it is convenient to disassemble.