First, improve the surface heat transfer coefficient of the plate. Since the wave of the plate heat exchanger can make the fluid turbulent at a small flow rate (reynolds number 150), it can obtain a higher surface heat transfer coefficient, the surface heat transfer coefficient and the geometry and the medium of the plate ripple Related to the state of flow. The waveform of the plate includes herringbone, straight, spherical, and so on. After years of research and experiments, it has been found that the shape of the corrugated cross section is triangular (the heat transfer coefficient of the sinusoidal surface is large, the pressure drop is small, the stress distribution is uniform under compression, but the processing is difficult?), The herringbone plate has a higher surface The heat transfer coefficient, and the larger the included angle of the corrugations, the higher the medium velocity in the flow path between the plates, and the larger the surface heat transfer coefficient.
Second, 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 scale thickness of the plate is 1 mm, the heat transfer coefficient is reduced by about 10%. Therefore, it is necessary to pay attention to monitoring the water quality on both sides of the plate heat exchanger to prevent plate scale and prevent 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 water quality and adhesives to contaminate the plate heat exchanger plates. 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.
Third, select the 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 / (mK), high strength, good stamping performance, not easy to be oxidized, lower price than titanium alloy and copper alloy, it is used a lot in heating engineering, but its resistance to chlorine Poor ability to ion corrosion.
For more information, please Baidu: Taylor Plate Heat Exchanger
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