A tunnel dryer is to be designed to dry, by crossflow with air, a wet solid that
Question:
A tunnel dryer is to be designed to dry, by crossflow with air, a wet solid that will be placed in trays measuring 1.5 m long x 1.2 m wide x 25 cm deep. Drying will be from both sides. The initial total moisture content is 116% (dry basis) and the desired final average total moisture content is 10% (dry basis). The air conditions are 90°F and 1 atm with a relative humidity of 15%. The following laboratory data were obtained under the same conditions:
Determine the total drying time to dry the same material from 110% to 10% moisture content if the air conditions are changed to 125°F and 20% relative humidity. Assume that the critical moisture content will not change and that the drying rate is proportional to the difference between the dry-bulb and wet-bulb temperatures of the air. All moisture contents are on the dry basis.
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