Discussion
Statement I: Bed depth in a deep bed dryer is limited by the drying potential of the air.
Statement II: Air leaving the lower layers is cooler and more humid than the air entering.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. Air passing through the lower layers gives up sensible heat and takes up moisture, so it emerges cooler and more humid - with its drying potential partly spent.
By the time it reaches the upper layers of a deep bed it may be close to saturation and able to remove very little, so those layers dry slowly while the bottom is over-dried. The depth is therefore limited by how much drying potential the entering air carries, which is why practical designs reverse the airflow, recirculate the grain, or simply keep the bed shallow.
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