Question

1) 30 kg of wet solid material which 5 kg water was dried for a total of 4.5 hours until the moisture content fell to 0.02 kg/kg dry solid. The equilibrium moisture of the material at constant conditions used was known to be 0.008 kg/kg dry solid. If the critical moisture content is 0.12 kg/kg solid. Calculate the time needed to dry the same material from an initial of 40 kg (20% moisture) to 34 kg (5.88% moisture).

(complete solution & explanation please!)

Answer 1