A granular insoluble solid material wet with water is being dried in the constant-rate period in a pan 0.61m0.61m and the depth of material is 25.4mm. The sides and bottom are insulated. Air flows parallel to the top drying surface at a velocity of 3.05m/s and has a dry bulb temperature of 60C and a wet bulb temperature of 29.4C. The pan contains 11.34kg of dry solid having a free moisture content of 0.35kgHH2O/kg dry solid, and the material is to be dried in the constant-rate a) Predict the drying rate period and the time in hours needed. b) Predict the time needed if the depth of material is increased to 44.5mm