Question

A solid material containing 15% w is moisture is dried so that it contains 7% w H2O by blowing fresh air mixed with recycle air over the solid in the drier. The inlet fresh air has a humidity of 0.01 kg H2O/kg dry air. The air from the drier that is recycled has a humidity 0.1kg H2O/ kg dry air and the mixed air to the drier of 0.03 kg H2O/ kg dry air. For a feed of 100 kg solid /hr fed to the drier, calculate

(a) kg/hr of dry air in the fresh air

(b) kg/hr of dry air in the recycle air c) kg/hr of dried product.

Answer 1

using mas balance over dryr we can find the required variables

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