Question

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

(a) Biological Fouling

(b) Chemical Fouling

(c) Corrosion Fouling

(d) Freezing Fouling

This question was posed to me in a national level competition.

The origin of the question is Heat Transfer Applications topic in portion Heat Transfer Applications of Food Processing Unit Operations

Answer 1

Correct choice is (a) Biological Fouling

To explain I would say: 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.