Certified Energy Manager (CEM)

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An energy manager reviewing boiler operations notices a gradual increase in stack gas temperature over several months, even though the firing rate and excess air levels have remained consistent. What is the most likely cause of this change?

A decrease in feedwater temperature. Fouling of heat transfer surfaces inside the boiler. A malfunctioning steam trap in the distribution system. An increase in ambient air humidity.

Correct Answer:

Fouling of heat transfer surfaces inside the boiler.

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