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What are the contents of plate heat exchanger selection? What are the requirements for the standard?
| Release time: 2019.12.14 News source: Zibo Taylor Heat Exchange Equipment Co., Ltd. |
| Recently, many customers contacted us and asked us about the problems they encountered in the use of plate heat exchangers. I hope that we can help. Today, Xiaobian has knowledge about the selection of plate heat exchangers and Let's discuss it together, hoping to bring inspiration and help to our customers and friends, and let everyone have a deep understanding of the plate heat exchanger. In this way, everyone can know what to do in the future in the process of use, and don't panic and play the maximum role of the plate heat exchanger. |
Requirements for the selection of plate heat exchangers :
1. Plate type selection: The plate type or 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, and a plate with a large resistance should be used. Depending on the fluid pressure and temperature, determine whether to choose a detachable or brazed type. When determining the plate type, it is not appropriate to choose a plate with a too small area, so as to avoid too many plates, the flow velocity between the plates is too small, and the heat transfer coefficient is too low. This problem should be paid more attention to for larger heat exchangers.
2. Process and flow channel selection: A process refers to a group of parallel flow channels with the same flow direction of a medium in a plate heat exchanger, while a flow channel refers to a medium flow channel composed of two adjacent plates in a plate heat exchanger. In general, several flow channels are connected in parallel or in series to form different combinations of cold and hot medium channels.
The process combination form should be calculated based on heat exchange and fluid resistance, and determined under the requirements of 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 velocity between the plates of the plate heat exchanger varies, the average flow velocity is still used in the calculation of heat exchange and fluid resistance. Since the "U" shaped single-pass nozzles are fixed on the pressure plate, it is easy to disassemble. Power Station Valve
3. Pressure drop check: When selecting the plate heat exchanger, there are generally certain requirements for the pressure drop, so it should be checked. 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.
For more information, please Baidu: Taylor Plate Heat Exchanger
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