question archive A drier is to be designed to reduce the water content of a certain material from 180% to 10% (db)

A drier is to be designed to reduce the water content of a certain material from 180% to 10% (db)

Subject:ChemistryPrice: Bought3

A drier is to be designed to reduce the water content of a certain material from 180% to 10% (db). The available air is @ 70F and has an absolute humidity 0.010. In order to produce the desired drying conditions, the air entering the drier is to have a temperature of 120F and a humidity of 0.010 lb water / lb dry air and the exit air will leave at 110F with 70%RH. On the basis of 100lb of product/hour, and neglecting the heat capacity of the bone dry stock, calculate: a. Air is entering the preheater, in fts/min b. Air entering the drier as fts/min c. BTU/hr to be supplied by the preheater d. BTU/hr to be supplied the heating surface W/in the drier e. Total BTU consumed/lb of evaporation f. Dry bulb, wet bulb and dew point for air entering the preheater, the air entering the drier and the air leaving the drier.

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