Three methods let you choose a good heat exchanger easily 1. The plate type or corrugated type should be determined according to the actual needs of heat exchange occasions. For the case where the flow rate is large and the pressure drop is small, the plate type with low resistance should be selected; otherwise, the plate type with high resistance should be used. According to the fluid pressure and temperature, determine the choice of removable or brazed. When determining the plate type, it is not advisable to select plates with too small veneer area, so as to avoid too many plates, small flow velocity between plates, and low heat transfer coefficient. This problem should be paid more attention to for larger heat exchangers.
2. Regarding the design and selection of plate heat exchangers, generally there are certain requirements for pressure drop, so they should be checked. If the check pressure drop exceeds the allowable pressure drop, the design selection calculation shall be performed again until the process requirements are met.
3. The heat exchanger process refers to a group of parallel flow channels in the same flow direction of a medium in the plate heat exchanger, and the flow channel refers to the medium flow channel composed of two adjacent plates in the plate heat exchanger. Generally, several flow channels are connected in parallel or in series to form different combinations of cold and hot medium channels. The flow combination form should be calculated based on heat exchange and fluid resistance, and determined when the process conditions are met. Try to make the convection heat transfer coefficients in the cold and hot water channels equal or close to obtain the best heat transfer effect. Although the flow rate between the plates of the plate heat exchanger is not equal, in the calculation of heat transfer and fluid resistance, the average flow rate is still used.
发布时间 : 2020-04--16
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