(i) (ii) A wetted non-porous solid with an initial dry mass of 1.5 Kg is dried under constant drying conditions in an air stream flowing at 0.85m/s. The area of surface drying is 55m. If the initial rate of drying is 0.3 g/m, how long will it take to dry the material from 0.15 to 0.025 Kg water / Kg dry solid? The critical moisture content of the material may be taken as 0.125 Kg water / Kg dry solid. If the air velocity were increased to 4.0 m/s, what would be the anticipated saving time if the process were surface - evaporation-controlled?