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 the material is 25.4mm. The sides and bottom are insulated. Air flows parallel to the top drying surface at a velocity (vair) of 3.05m/s and has a dry bulb temperature ( Tair ) of 60C and a wet bulb temperature (Tw)29.4C. The pan contains 11.34kg of dry solid (Ls) and having a free moisture content (X1) of 0.35 period to (X2)0.22kgHH2O/kg dry solid. Given w=2450kJ/kg,P=101.3kPa, gas constant (R)=8.314m3Pa/K mol. Evaluate: (a) The drying rate (g/m2s) and the time in hour needed. [15 Marks] (b) The time needed if the depth of material is increased to 44.5mm. [5 Marks] 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 the material is 25.4mm. The sides and bottom are insulated. Air flows parallel to the top drying surface at a velocity (vair) of 3.05m/s and has a dry bulb temperature ( Tair ) of 60C and a wet bulb temperature (Tw)29.4C. The pan contains 11.34kg of dry solid (Ls) and having a free moisture content (X1) of 0.35 period to (X2)0.22kgHH2O/kg dry solid. Given w=2450kJ/kg,P=101.3kPa, gas constant (R)=8.314m3Pa/K mol. Evaluate: (a) The drying rate (g/m2s) and the time in hour needed. [15 Marks] (b) The time needed if the depth of material is increased to 44.5mm. [5 Marks]