Discussion
The typical aeration air flow rate for a grain store is of the order of
Answer: A
Correct answer: 0.1 cubic metres per minute per tonne
Aeration flows are of the order of \( 0.1 \) cubic metres per minute per tonne - enough to move a cooling front slowly through the bulk over many hours, but far too little to remove significant moisture.
The contrast with drying is the point: a dryer uses one to two orders of magnitude more air, which is why aeration cannot be used to correct grain stored too wet. The low flow is also what makes aeration cheap, since fan power scales steeply with air flow through a packed bed.
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