The most typical type of wall-mounted heat exchanger, which has a long history in industrial applications, still dominates all heat exchangers. The main structure is composed of a heat exchange plate and a strip between the plates. It has long dominated the market, but its volume is large, heat exchange efficiency is low, and the replacement of strips is expensive (the replacement cost of strips accounts for about 1/3-1/2 of the entire process). It is mainly used for heat exchange between liquid and liquid. It is often called water and water heat exchange in the industry, and its heat exchange efficiency is 5000w/m2.K. In order to increase the heat transfer coefficient of the fluid outside the pipe, a certain number of transverse baffles are usually installed in the casing. The baffle plate not only prevents fluid short circuit, increases fluid velocity, but also forces the fluid to flow through the tube bundle multiple times in a prescribed path, so that the degree of turbulence is greatly increased. Commonly used baffles are round and disc shaped, and the former is more widely used. At present, due to the introduction of the new version of GMP in China, plate heat exchange will gradually withdraw from industries with high hygiene level such as food, beverage and pharmaceutical.

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