Plate heat exchangers use metal plates (0.5~1.0mm in thickness) as heat exchange elements, which are pressed by thin plates of stainless steel, industrial pure titanium or other materials. Plate heat exchangers are favored by more and more industries. For some companies that want to buy board replacements, they don’t know what size model to choose to meet their working conditions. So what are the elements of plate heat exchanger selection?
(1) Selection of the model and specification of the heat exchanger plate.
The plate type or corrugated type should be determined according to the actual needs of the heat exchange occasion. If the flow rate is large and the pressure drop is small, the plate type with low resistance should be selected. According to the fluid pressure and temperature, determine whether to choose a detachable type or a brazed type.
(2) The process and flow channel of the plate heat exchanger.
The process of the plate heat exchanger refers to a group of parallel flow channels in the same flow direction of a medium in the plate heat exchanger. The flow channel refers to the medium flow channel formed by two adjacent plates in the plate heat exchanger. The process combination form should be calculated based on heat exchange and fluid resistance, and determined under the requirements of process conditions. When designing, we should try to make the convection heat transfer coefficients in the cold and hot water channels equal or close to get the best heat transfer effect. Because the "U"-shaped single-flow pipes are fixed on the compression plate, it is convenient to disassemble and assemble.
(3) The pressure drop check calculation for plate heat transfer.
In the design and selection of plate heat exchangers, there are generally certain requirements for pressure drop, so it should be checked. If the pressure drop of the heat exchanger exceeds the allowable pressure drop, the design and selection calculations need to be re-calculated until the process requirements are met.