Discussion
Assertion (A): Exhaust air leaving a dryer hot and unsaturated indicates good efficiency.
Reason (R): Such air still carries unused capacity to take up moisture.
Select the correct answer from the options below.
Answer: A
Correct answer: A is false but R is true
The assertion is false, and the reason is why. Air leaving hot and unsaturated indicates poor efficiency, not good: it carries away sensible heat that did no drying and, as the reason states, unused capacity to take up moisture.
Good efficiency shows in the opposite signature - exhaust that is as cool and as close to saturation as the process allows, because that means the heat and the drying potential were both spent on the product. The remedies follow directly: recirculate part of the exhaust, lengthen the residence time, or recover the heat.
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