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Heat transfer method and flow rate of plate heat exchanger

Views:0     Author:Site Editor     Publish Time: 2020-04-24      Origin:Site

  The plate heat exchanger is a partition heat transfer heat exchanger during operation. In use, its cold and hot fluid is mainly transferred through the heat exchange fins. During operation, the fluid will directly contact the plate. The heat transfer method will be heat conduction and convection heat transfer. The key to improving the heat transfer efficiency of the plate heat exchanger is to increase the coefficient of heat transfer and the average temperature difference of the logarithm. Improve the heat transfer coefficient of the heat exchanger only at the same time increase the coefficient of heat transfer on the surface of both sides of the plate, reduce the thermal resistance of the dirt layer, select the plate with higher thermal conductivity, and reduce the thickness of each plate. It can effectively improve the heat transfer coefficient of the heat exchanger.

  The corrugation of the plate heat exchanger can cause the fluid to generate turbulence at a lower flow rate, and can obtain a higher surface heat transfer coefficient. The surface heat transfer coefficient is related to the geometry of the plate ripple and the flow state of the medium. After years of research and experiments, it has been found that the herringbone plate with a corrugated cross-section in the shape of a triangle has a higher coefficient of surface heat transfer, and if the angle of the corrugation is larger, the velocity of the medium in the flow path between the plates will be more The higher, the greater the coefficient of surface heat transfer.

  The key to the thermal resistance of the fouling layer of the plate heat exchanger is to prevent the plates from scaling. When the plate fouling thickness is 1 mm, the heat transfer coefficient is reduced by about 10%. Care must be taken to monitor the water quality on both sides of the heat exchanger, to prevent the plates from scaling and to prevent sundries from adhering to the plates.

  The material of the plate can be stainless steel, titanium alloy, copper alloy, etc. The thermal conductivity of stainless steel is also very good, the strength is also very high, the stamping performance is also very good, it will not be easily oxidized, and the price is lower than that of titanium alloy and copper alloy. It is used more in heating projects, but Its resistance to chloride ion corrosion is poor. The design thickness of the plate has nothing to do with its corrosion resistance, and it is related to the pressure-bearing capacity of the heat exchanger. If the plate is thickened, it can improve the pressure capacity of the heat exchanger. Under the premise of satisfying the pressure-bearing capacity of the heat exchanger, the thickness of the smaller plate should be selected as much as possible.

  The process of the plate heat exchanger is a heat exchange between the plates, thus forming a thin rectangular channel. Its principle is a kind of thermal exchange equipment based on liquid-liquid and liquid-vapor. Since the material of this plate heat exchanger can effectively carry out heat exchange, it is justified that it is liked by consumers. In addition, its shape is relatively exquisite, high durability and long service life, and it surpasses similar materials at a certain level.


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