Discussion
Fouling of a heat exchanger shows itself as
Answer: A
Correct answer: a rising approach temperature for the same duty
A fouling layer adds thermal resistance, so the exchanger transfers less heat per degree available and the streams leave further apart. Pressure drop rises rather than falls, since the deposit narrows the passage, and the entering hot stream is set by the process upstream and is unaffected. Tracking the approach over time is the standard way of deciding when to clean.
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