Plate type or corrugated type should be based on the actual needs of heat transfer occasions. Large allowable pressure drop on the flow of small cases, should use a small resistance plate type, and vice versa use the resistance of the plate type. Depending on the fluid pressure and temperature, determine whether to choose a removable or brazed. Determine the plate type should not choose the board area is too small plate, so as not to plate too much, the flow between the board is too small, the heat transfer coefficient is too low, the larger heat exchanger should pay attention to this problem.
The flow refers to a set of parallel flow paths in the same flow direction of a medium in the plate heat exchanger, and the flow path of the medium plate adjacent to the two plates. In general, several flow paths are connected in parallel or in series to form different combinations of cold and heat medium passages.
Process combinations should be based on heat transfer and fluid resistance calculation, to meet the requirements of the process to determine the conditions. As far as possible to cold, hot water flow within the convective heat transfer coefficient equal to or close, so as to get the best heat transfer effect. Because the heat transfer coefficient on both sides of the heat transfer coefficient is equal or close to the heat transfer coefficient to obtain a larger value. Although the plate heat exchanger between the plate flow rate, but in the heat transfer and fluid resistance calculation, the average flow rate is still calculated. As the "U" -shaped single-step takeover are fixed on the compression plate, easy disassembly.
In the plate heat exchanger design selection, the general pressure drop has certain requirements, so it should be checked. If the check pressure drop exceeds the allowable pressure drop, the design selection is to be repeated until the process requirements are met.