Mass Transfer
Batch tray dryers suffers from the disadvantage of

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

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Mass Transfer
The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp = M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force.)

Kc = Kp . RT = Km . RT/p
Kc = Kp = Km
None of these
Kc = Kp/RT = Km . RT/P

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