One major issue in using engine cooling air for drying would be the
power requirement.
Typically, the engine cooling fan consumed about 5% of BHP ( BHP, not
net power). Assuming similar pressure drop for the dryer system, another
5% of BHP towards power consumption of dryer would be too high a
parasitic load.
Typically the cooling air would be @ 50-55 Deg C ( amx in Indian
conditions). This temperature would be sufficient to dry out the
surface moisture. For drying beyond the surface, a higher temperature
differential would be required to drive the heat transfer at a
reasonable rate so as to make the residence times reasonable.
Regards
Shivanand
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