The range of use of plate heat exchangers is very wide, so how to improve the efficiency of plate heat exchangers in use? Let's take a brief look below.
1. Due to the ripple of the plate heat exchanger, the fluid can generate turbulence at a smaller flow rate, resulting in a higher surface heat transfer coefficient. The surface heat transfer coefficient is related to the geometric structure of the 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 has been found that herringbone plates with a triangular corrugated cross-section have a higher surface heat transfer coefficient, and the larger the angle between the corrugations, the higher the flow velocity of the medium in the inter plate flow channel, and the greater the surface heat transfer coefficient.
The key to reducing the thermal resistance of the fouling layer in the heat exchanger is to prevent plate fouling. When the thickness of the plate fouling is 1mm, the heat transfer coefficient decreases by about 10%. Therefore, it is necessary to pay attention to monitoring the water quality on both the hot and cold sides of the heat exchanger to prevent plate fouling and prevent impurities from adhering to the plates in the water. Some heating units add chemicals to the heating medium to prevent water theft and corrosion of steel components. Therefore, it is necessary to pay attention to water quality and adhesives that can cause impurities to contaminate the heat exchanger plates. If there are viscous impurities in the water, a dedicated filter should be used for treatment. When selecting agents, it is advisable to choose non viscous agents.
3. The material of the plate can be stainless steel, titanium alloy, copper alloy, etc. Stainless steel has good thermal conductivity, with a thermal conductivity of about 14.4 W/(m • K), high strength, good stamping performance, and is not easily oxidized. Its price is lower than titanium and copper alloys, and it is most commonly used in heating engineering, but its ability to resist chloride ion corrosion is poor.