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How to improve the heat exchange efficiency of plate heat exchanger

How to improve the heat exchange efficiency of plate heat exchanger

2022-09-30

Plate heat exchanger is a wall heat exchanger. The cold fluid transfers heat through the plates of the heat exchanger. The fluid directly contacts the plates. The heat transfer mode is heat conduction and convection heat transfer. The key to improve the heat transfer efficiency of plate heat exchanger is to improve the heat transfer coefficient and logarithmic average temperature difference. 1. To improve the heat transfer coefficient of the heat exchanger, the only way to effectively improve the heat transfer coefficient of the heat exchanger is to simultaneously increase the surface heat coefficient of the hot and cold sides of the plate, reduce the thermal resistance of the scale layer, select the plate with high thermal conductivity and reduce the thickness of the plate. (1) Improve the surface heat transfer coefficient of plates Because the ripple of plate heat exchanger can make the fluid turbulent at a small flow rate, it can obtain a higher surface heat transfer coefficient, which is related to the geometric structure of plate ripple and the flow state of the medium. The waveform of the plate includes herringbone, straight, spherical, etc. After years of research and experiments, it is found that the herringbone plate with triangular corrugated section has a higher surface heat transfer coefficient, and the greater the included angle of the corrugated, the higher the medium velocity in the flow path between the plates, and the greater the surface heat transfer coefficient. (2) Reduce the thermal resistance of the dirt layer The key to reduce the thermal resistance of the fouling layer of the heat exchanger is to prevent the plate structure. When the thickness of the plate structure is 1mm, the heat transfer coefficient decreases by about 10%. Therefore, attention must be paid to monitoring the water quality at both cold and hot ends of the heat exchanger to prevent the plate structure and prevent impurities in the water from adhering to the plate. In order to prevent water theft and steel corrosion, some heat supply units add chemicals to the heating medium. Therefore, attention must be paid to the water quality and viscous chemicals, which may cause impurities to contaminate the heat exchanger plates. If there are viscous impurities in the water, special filters shall be used for treatment. When selecting the medicament, it is better to select the medicament without viscosity.

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