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Chapter: Aquaculture Engineering - Heating and Cooling

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Materials in heat exchangers

Heat exchangers are built of different materials for different purposes.

Materials in heat exchangers

Heat exchangers are built of different materials for different purposes. It is important that the material has good conductivity, such as a metal, and that the heat transfer surfaces are corrosion-resistant. In fish farming, it is also important that the materials do not release substances that are toxic for the fish, e.g. copper. The more contami-nated the flowing media are, either by acids or bases, the more resistant to corrosion the heat transfer surface areas need to be; however, this will increase the price of the material.

If the media are water and it is uncontaminated, stainless steel could be used. If the water is conta-minated to some extent, for instance with humus substances, acid-proof steel at least should be used. If the water is salt or brackish, titanium covered plates ought to be used. For ground water titan-covered plates are also recommended; the price of these is, however, much higher than for stainless steel plates.


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