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Question:

how can we find out the time of washing the heat exchangerby "fouling factor"?

engineering

Answer:

It seems your question has to do with when does a heat exchanger get fouled enough to require cleaning. That is strictly a matter of economics. You can simply look at the inlet and outlet temperatures and do a heat transfer calculation to determine when the cost of shutting down and cleaning is less than the amount of heat (or cooling) you are losing.

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