Discussion
In a deep bed dryer, the air leaving the lower layers is
Answer: D
Correct answer: Cooler and more humid than the air entering
As air passes through the lower layers of a deep bed it gives up sensible heat to evaporate water and picks up that water as vapour. It therefore leaves those layers cooler and more humid than it entered - its drying potential partly spent.
This is the fundamental limit on bed depth. By the time the air reaches the top of a deep bed it may be near saturation and able to remove almost nothing, so the upper layers dry very slowly while the lower ones may be over-dried. Practical designs limit the depth, reverse the airflow, or recirculate the grain.
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