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
McCabe-Thiele method

Uses weight fractions to express liquid and vapour composition
Can use any type of units
Is more accurate than Ponchan-Savarit method
Uses molal units for material and energy balance

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