APV Dryer Handbook University of Maryland, Baltimore .
APV Dryer Handbook 12/6/00 10:52 AM Page 10. 11 In such a plant, the drying cycles are extended, with 24 to 45 hours being quite common in certain cases. This is a direct result of the low evaporative rate, which normally is in the region of to lb/ft2hr. ( to kg/m2h).