1. Reduce the thermal resistance of the dirt layer
The key to reducing the thermal resistance of the dirt layer of the plate heat exchanger is to prevent plate fouling. When the sheet thickness is 1 mm, the heat transfer coefficient is reduced by about 10%. Therefore, care must be taken to monitor the water quality on both the hot and cold sides of the heat exchanger, to prevent plate fouling, and to prevent debris in the water from adhering to the plate. Some heating units add chemicals to the heating medium in order to prevent water theft and corrosion of steel parts. Therefore, attention must be paid to the contamination of the heat exchanger plates caused by debris caused by water quality and adhesives. If there are sticky impurities in the water, special filters should be used for treatment. When selecting a medicament, a non-sticky medicament should be selected.
2. Use a plate with high thermal conductivity
The plate material can be selected from austenitic stainless steel, titanium alloy and copper alloy. Stainless steel has good thermal conductivity, thermal conductivity of about 14.4 W / (m • K), high strength, good stamping performance, is not easy to be oxidized, and has a lower price than titanium and copper alloys. It is used most in heating projects, but its Poor resistance to chloride ion corrosion.
3． Reduce plate thickness
The design thickness of the plate has nothing to do with its corrosion resistance, and it is related to the pressure capacity of the plate heat exchanger . Thicker plates can increase the pressure capacity of the heat exchanger. When the herringbone plate combination is used, adjacent plates are inverted, and the corrugations contact each other, forming a dense and evenly distributed fulcrum. The plate corner 孑 L and the edge sealing structure have been gradually improved, which makes the heat exchanger have a good Pressure endurance. The maximum pressure capacity of domestic detachable plate heat exchangers has reached 2.5 MPa. 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 600 W / (m • K), and the asymmetric type is increased by about 500 W / (m • K. ). On the premise that the pressure capacity of the heat exchanger is satisfied, the plate thickness should be selected as small as possible.
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Zibo Taylor Heat Exchange Equipment Co., Ltd.
Contact: Wang Qian
Address: No. 32, Xiling Street, Fushan District, Boshan District, Zibo City