Mass Transfer
Batch tray dryers suffers from the disadvantage of

All of the listed here
Non-uniform & low production rate
High labour cost & low heat economy
High maintenance cost

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Mass Transfer
At equilibrium the concentration of water in vapour phase (C*)in kg/m³ of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m³ containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is

1
0.4
0.2

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