The plate heat exchanger is a high-efficiency heat exchanger made up of a series of metal sheets with a certain corrugated shape. It has the characteristics of high heat exchange efficiency, low heat loss, compact and lightweight structure, small footprint, wide application and long service life. So how to improve the efficiency of the plate heat exchanger in use?
(1) The corrugation of the plate heat exchanger can cause the fluid to produce turbulence at a small flow rate, so it can obtain a higher surface heat transfer coefficient. The surface heat transfer coefficient is related to the geometric structure of the plate corrugation and the flow state of the medium. The waveform of the plate includes herringbone, straight and spherical. After years of research and experimentation, it has been found that the herringbone plate with triangular corrugated cross-section has a higher surface heat transfer coefficient, and the greater the angle of the corrugation, the higher the flow rate of the medium in the flow channel between the plates, and the greater the surface heat transfer coefficient .
(2) The key to reducing the thermal resistance of the fouling layer of the heat exchanger is to prevent fouling of the plates. When the plate fouling thickness is 1mm, the heat transfer coefficient is reduced by about 10%. Therefore, we must pay attention to monitoring the water quality on both sides of the heat exchanger to prevent fouling of the plates and prevent debris in the water from adhering to the plates.
(3) The plate material can choose stainless steel, titanium alloy, copper alloy. Stainless steel has good thermal conductivity, with a thermal conductivity of about 14.4 W/(m•K), high strength, good stamping performance, and resistance to oxidation. The price is lower than that of titanium alloy and copper alloy, and it is used most in heating engineering, but its ability to resist chloride ion corrosion is poor.