Question: A solid food is dried in a tray dryer, using constant air conditions and a material thickness on the tray of 25.4 mm. Only the

A solid food is dried in a tray dryer, using constant air conditions and a material thickness on the tray of 25.4 mm. Only the top surface of the tray is exposed to drying. The drying rate during the constant period is 2.05 kg water/h m2. The LA ratio used is 24.4 Kg dry solids/m2. From experimental data it is known that the initial and critical moisture levels of the product are: 0.55 and 0.22 Kg water/Kg dry solids, respectively.

Calculate the time to dry a batch of this material from a moisture content of 0.5 kg water/kg dry solids up to 0.25, but considering that the drying area is now that of the upper and lower surfaces of the tray.
What is the drying time in the entire period at constant speed for the two cases, drying on one side and drying on two sides?

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