Plate heat exchanger is a kind of high-efficiency heat exchanger made of a series of metal plates with a certain corrugated shape. With its unique working principle and unique composition structure, it stands out from many heat exchangers. How to choose a plate heat exchanger?
(1) Pay attention to the selection of flow channel, plate type selection and pressure drop check when purchasing the plate heat exchanger model. The plate type selection of plate type or plate corrugated type should be determined according to the actual needs of the heat exchange occasion. For a large flow rate and a small allowable pressure drop, a plate with a small resistance should be selected,.Otherwise,and a plate with a large resistance should be used.
(2) Determine whether to choose a removable or brazed plate heat exchanger based on the pressure and temperature of the fluid.
When determining the shape, it is not appropriate to choose a plate with a too small area to avoid too many plates. The velocity between the plates is too small and the heat transfer coefficient is too low.
(3)The process combination should be calculated based on heat exchange and fluid resistance, and determined under the requirements of the process conditions.Try to make the convective heat transfer coefficients in the cold and hot water channels equal or close to each other, so as to obtain the best heat transfer effect. Because the convective heat transfer coefficients on both sides of the heat transfer surface are equal or close, the heat transfer coefficient gets a larger value.Although the flow rate between the plates of the plate heat exchanger varies, the average flow rate is still used in the calculation of heat transfer and fluid resistance. Since the "U" shaped single-pass nozzles are fixed on the pressure plate, it is easy to disassemble.
(4) Check the pressure drop in the design of the plate heat exchanger. If the check pressure drop exceeds the allowable pressure drop, the design selection calculation needs to be performed again until the process requirements are met.