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Which is the common fouling mechanism seen when untreated water is used as the coolant?

Which is the common fouling mechanism seen when untreated water is used as the coolant? Correct Answer Biological Fouling

Biological Fouling is due to the microorganisms present on heat transfer surfaces. It is a common fouling mechanism seen when untreated water is used as the coolant. A variety range from algae to other microbes can be seen. These microbes are grow into colonies within hours, restricting heat transfer.

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