Plate heat exchanger pressure drop check

1, pressure check

Design selection so that the general pressure drop has a certain requirement, so it should be checked. If the check pressure drop exceeds the allowable pressure drop, it is necessary to redesign the selection calculation until the technical requirements are met.

2, flow and flow channel selection

A group of parallel flow heat exchanger in the process of the fingerboard of a medium with a flow direction, flow and fingerboard heat exchanger, two adjacent plates composed of medium flow channel. In general, a plurality of flow channels are connected in parallel or in series to form a combination of cold and hot media channels.

The form of flow combination should be determined according to the heat transfer and fluid resistance. As far as possible, the convection heat transfer coefficient in the cold and hot water channel is equal or close, so as to get the best heat transfer effect. Because the convective heat transfer coefficient is equal or close to the heat transfer surface, the heat transfer coefficient is obtained. Although the plate plate flow velocity varies, but in the calculation of heat transfer and fluid resistance, the average flow rate is calculated. Due to the "U" shape of the single process of the tube are fixed on the board, easy disassembly.

3, plate selection

The plate type or the corrugated type should be determined according to the actual needs of the heat exchanger. The pressure on the flow is small, the use of small resistance plate type, or choose a large resistance plate. According to the pressure and temperature of the fluid, determine the choice of removable, or brazing. Determine the plate type should not choose the board area is too small plate, so as to avoid the excessive number of plates, plate flow rate is too small, the heat transfer coefficient is too low, the larger heat exchanger should pay attention to this problem.