Heat Transfer
Economy of a multiple effect evaporator is not influenced much by the

boiling point elevations
rate of heat transfer
temperature of the feed
ratio of the weight of the thin liquor to thick liquor

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Heat Transfer
In sub-cooled boiling,

Bubbles from heating surface are absorbed by the mass of the liquid
Temperature of the heating surface is more than the boiling point of the liquid
Temperature of the heating surface is less than the boiling point of the liquid
Very large vapour space is necessary

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