Discussion
Consider the following pairs of measure and how it is improved:
Drying efficiency - Recirculating part of the exhaust air
Uniformity of final moisture - Recirculating the grain between passes
Head rice yield - Tempering between drying passes
Drying rate in the falling rate period - Raising the air velocity
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
Three pairs are right. Recirculating part of the exhaust air improves drying efficiency by recovering sensible heat that would otherwise be thrown away; recirculating the grain between passes evens out the final moisture; and tempering between passes raises head rice yield by letting internal gradients relax before the next pass.
The fourth is wrong. Raising the air velocity does little in the falling rate period, because the rate is limited by moisture movement inside the solid rather than by transfer across the boundary layer. It is during the constant rate period that velocity helps.
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