In deep bed grain drying with heated air moving upward from the plenum chamber, the drying process establishes three zones in the bed, arranged from bottom to top as:
Options:
(A) Dried zone \to Drying zone \to Wet (un-dried) zone
(B) Wet zone \to Drying zone \to Dried zone
(C) Drying zone \to Wet zone \to Dried zone
(D) Saturated zone \to Superheated zone \to Cold zone
Answer Key:
A
Step-by-Step Solution & Explanation
Hot dry air enters at the bottom creating a bottom dried zone, a narrow drying front where moisture transfer occurs, and an upper wet zone where exhaust air cools to near saturation.