Heat Transfer
Increasing the liquor level in the evaporator results in the

decreased effect of hydrostatic head
decreased capacity
increase in liquor film co-efficient
increased true temperature drop

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Heat Transfer
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the

Average temperature of the fin
Constant temperature equal to that of the base
Temperature of the fin end
Surrounding temperature

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