Heat exchangers are used in a wide variety of different applications. They are ideal for using the different temperature between two liquids or semi-solids to cause a heat change in one or both of the sides of the exchange.
For simplicity sakes, image two pipes running parallel and touching each other. One has hot water, and one has cold water. The water running along the sides of the pipe that make contact would be cooler on the hot pipe side and warmer on the cold pipe side. This would be a highly simplistic version of a surface heat exchange.
The key is that the two liquids do not make direct contact, but rather are separated by what is known as the exchange wall. With water or other liquids that have low viscosity, the “warm” water formed in both the hot and cold pipes would change the temperature of both, raising the cold and lowering the hot as it moves through the pipe.
The Problem With Viscose Materials
The problem with the principle comes into play with viscous materials. In this case, the sludgy and slower moving liquids do not circulate, resulting in irregular heating at the heat exchange.
The answer to this issue is to use scraped surface heat exchangers. These exchangers use a specific method that forces or projects the thick, viscous layer on the exchange side into the rest of the material flowing through that side of the system.
With the use of scraped surface heat exchangers, the blades create additional turbulence of irregularities in the flow. This, in turn, creates a better and more efficient way to accommodate the desired temperature change on both sides of the system.
It is important to realize that scraped surface heat exchangers are not just designed for heating. They can also be very effective at cooling products, making them an ideal choice for the semi-solid and viscous materials in sanitary production.
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