1. Improve the heat transfer coefficient of the heat exchanger. Only by simultaneously increasing the surface thermal coefficient of the hot and cold sides of the plates, reducing the thermal resistance of the scale layer, selecting plates with high thermal conductivity and reducing the thickness of the plates, can the exchange be effectively improved. The heat transfer coefficient of the heat exchanger.
a. Improve the surface heat transfer coefficient of the plate
Because the corrugations of the plate heat exchanger can cause the fluid to generate turbulence at a small flow rate, a higher surface heat transfer coefficient can be obtained. The surface heat transfer coefficient is related to the geometric structure of the plate corrugation and the flow state of the medium. Wave plates include a herringbone, flat surface, spherical surface, etc. After years of research and experimentation, it has been found that the corrugated cross-section shape is triangular (the heat transfer coefficient of the sinusoidal surface is the largest, the pressure drop is small, the stress distribution is uniform under pressure, but the processing is difficult?) It has a high heat transfer coefficient and a corrugated angle The larger the flow rate of the medium between the flow channel plates, the greater the heat transfer coefficient of the herringbone plate.
b. Reduce the thermal resistance of the dirt layer
The key to reducing the thermal resistance of the fouling layer of the plate heat exchanger is to prevent the plate from fouling. When the thickness of the plate structure is 1mm, the heat transfer coefficient is reduced by about 10%. Therefore, pay attention to monitoring the water quality at the hot and cold ends of the heat exchanger to prevent the plate structure and prevent the debris in the water from adhering to the plates. In order to prevent water theft and corrosion of steel parts, some heating units add chemicals to the heating medium, so pay attention to the water quality and viscous chemicals that cause debris to contaminate the heat exchanger plates. If there are viscous impurities in the water, special filters should be used for treatment. When choosing an agent, it is advisable to choose a non-sticky agent.
c. Use plates with high thermal conductivity
The plate material can choose austenitic stainless steel, titanium alloy, alloy, etc. Stainless steel has good thermal conductivity, thermal conductivity of about 14.4 W/(m?K), high strength, good stamping performance, not easy to oxidize, and lower price than titanium alloy and copper alloy. It is used for heating engineering, but it is corrosion-resistant to chloride ions. The resistance is poor.
d. Reduce plate thickness
The design thickness of the plate is independent of its corrosion resistance and is related to the pressure bearing capacity of the heat exchanger. Thick plates can improve the carrying capacity of the heat exchanger. When the herringbone plate combination is used, the adjacent plates are inverted and the corrugations are in contact with each other, forming a fulcrum with high density and uniform distribution. The corners of the plates and the edge sealing structure have been gradually improved, so that the heat exchanger has a good Pressure endurance. The maximum pressure-bearing capacity of the domestic detachable plate heat exchanger has reached 2.5MPa. The thickness of the plate has a great influence on the heat transfer coefficient, the thickness is reduced by 0.1mm, the total heat transfer coefficient of the symmetrical plate heat exchanger is increased by about 600W/(m?K), and the asymmetrical type is increased by about 500W/(m?K) . On the premise of meeting the pressure-bearing capacity of the heat exchanger, the thickness of the plate should be as small as possible.

Calvin (Ms)

Professional sales
Jiangyin M&C Heat Parts Co.,Ltd
Tel: 0510-86310522/20 Fax: 0510-86310566
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Email: calvin.s@mcheatps.com
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