Process Equipment and Plant Design
Stage efficiency for packed tower varies with the

Fluid rates and fluid properties
Operating pressure and column diameter
Type & size of packing
All of these

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Process Equipment and Plant Design
Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the

Neither A nor B
Practical limit reached, due to low heat transfer rate because of inadequate temperature difference
Economic limit reached, when the plant cost exceeds the saving of steam
Both A & B

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