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Cooling coil performance: effect of air velocity on by-pass factor As the face velocity of air through a cooling coil increases, how does the coil's by-pass factor typically change? Choose the correct trend.

Difficulty: Easy

Increases with increase in air velocity
Decreases with increase in air velocity
Remains unchanged with air velocity
May increase or decrease depending on inlet-air condition only

Correct Answer: Increases with increase in air velocity

Explanation:

Given/DefinitionsBy-pass factor (BPF) quantifies the fraction of air that effectively "bypasses" ideal contact with the coil surface (i.e., leaves above apparatus dew-point).

Concept/ApproachHigher air velocity reduces contact time and reduces heat/mass transfer effectiveness, so a larger fraction of air leaves closer to the inlet state → higher BPF.

Cooling coil performance: effect of air velocity on by-pass factor As the face velocity of air through a cooling coil increases, how does the coil's by-pass factor typically change? Choose the correct trend.

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