Heat Transfer
Small scale evaporation is done in a

Heat exchanger
Steam jacketed kettle
Condenser
Multiple effect evaporator

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Heat Transfer
In sub-cooled boiling,

Temperature of the heating surface is more than the boiling point of the liquid
Bubbles from heating surface are absorbed by the mass 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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