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How to choose a plate heat exchanger to avoid problems

How to choose a plate heat exchanger to avoid problems

  • Categories:Common problem
  • Author:
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  • Time of issue:2019-07-18 20:15
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(Summary description)The detachable plate heat exchanger is formed by a plurality of stamped corrugated sheets at regular intervals, surrounded by gaskets, and pressed by a frame and a compression screw

How to choose a plate heat exchanger to avoid problems

(Summary description)The detachable plate heat exchanger is formed by a plurality of stamped corrugated sheets at regular intervals, surrounded by gaskets, and pressed by a frame and a compression screw

  • Categories:Common problem
  • Author:
  • Origin:
  • Time of issue:2019-07-18 20:15
  • Views:
Information

The detachable plate heat exchanger is formed by a plurality of stamped corrugated sheets at regular intervals, surrounded by gaskets, and pressed by a frame and a compression screw. The four corner holes of the plates and the gasket form a fluid. The distribution pipe and the collecting pipe are simultaneously separated from each other reasonably, so that they flow in the flow paths on both sides of each of the plates, and heat exchange is performed through the plates. The theoretical research and product manufacturing of plate heat exchangers are constantly developing. New heat exchangers are emerging in the market, and their applications are becoming more and more extensive.

What should you pay attention to when selecting a plate heat exchanger?

Board type selection

The plate type or corrugated type should be determined according to the actual needs of the heat exchange occasion. For the case where the allowable pressure drop is large, the plate type with low resistance should be selected, and the plate with large resistance should be selected. Depending on the fluid pressure and temperature, it is determined whether the detachable or brazed type is selected. When determining the plate type, it is not suitable to select the plate with too small a single plate area, so as to avoid the excessive number of 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 the larger heat exchanger.

3. Pressure drop check

In the design and selection of the plate heat exchanger, there is a certain requirement for the pressure drop, so it should be checked. If the check pressure drop exceeds the allowable pressure drop, the design selection calculation must be repeated until the process requirements are met. Yuanwang BR type plate heat exchanger has the characteristics of high heat exchange efficiency, small material flow resistance loss, compact structure, sensitive temperature control, large operation flexibility, convenient assembly and disassembly, long service life, etc. It is the most advanced energy-saving in China. Heat exchange equipment.

2. Process and flow path selection

The process refers to a set of parallel flow channels in the same flow direction of a medium in a plate heat exchanger, and the flow path refers to a medium flow channel formed by two adjacent plates in a plate heat exchanger. In general, several flow passages are connected in parallel or in series to form different combinations of cold and heat medium passages.

The process combination should be calculated based on heat transfer and fluid resistance and determined to meet process conditions. Try to make the convective heat transfer coefficient in the cold and hot water flow channels equal or close, so as to get the best heat transfer effect. The heat transfer coefficient obtains a larger value because the convective heat transfer coefficients on both sides of the heat transfer surface are equal or close. Although the flow rates between the plates of the plate heat exchanger are not equal, the calculation is based on the average flow rate in the calculation of heat transfer and fluid resistance. Since the "U"-shaped single-flow nozzle is fixed on the pressing plate, the disassembly and assembly is convenient .

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