As a technologist you have been given a task to dry a wet biological material

As a technologist you have been given a task to dry a

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As a technologist, you have been given a task to dry a wet biological material under the above drying conditions from 25% to 4% moisture content (on a wet basis). The initial material weighs 150 kg and the material has a drying surface area of 1 m 2 per 40 kg of dry material. Based on the information given estimate the total drying time (in hour) needed to dry the wet biological material. Free moisture content, X kg H 2 O/kg dry weight Drying rate (R) x 10 4 kg/s.m 2 0.020 0.26 0.060 0.75 0.122 1.49 0.173 2.17 0.222 2.75 0.255 3.16 0.295 3.50 0.345 3.51 0.391 3.51 0.450 3.51
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1. Determine the initial and final moisture content of the biological material (X 1 and X 2 ) on dry basis. Wet basis moisture content (initial) = 0.25, Dry basis moisture content, X 1 = 0.25 / (1 - 0.25) = 0.333 kg H 2 0/kg dry solid Wet basis moisture content (final) = 0.04, Dry basis moisture content, X 2 = 0.04 / (1 - 0.04) = 0.042 kg H 2 0/kg dry solid
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2. Plot the graph R against X and determine the critical moisture content (X C ) and critical drying rate (R c ). X C = 0.295 , R C = 3.51 x 10 -4
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