A slab with a wet weight of 5 kg originally contains 50% moisture (wet basis). The slab is 600 by 900 by 75 mm thick. The equilibrium moisture content is 5% of the total weight when in contact with air of 20°C and 20% humidity. The drying rate is given in Table 1 for contact with air of the above quality at a definite velocity. Drying is from one face. Determine the time required to dry the slab to 10% moisture content (wet basis).

Table 24.1

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TABLE 24. Data for Prob. 24.3 Wet-slah weight, kg Drying rate, kg/m h 9.1 4.9 7.2 4.9 53 4.4 42 3.9 3.3 3.4 29 20 2.7 1.0