Heat Transfer
In a shell and tube heat exchanger, floating head is used for

Less corrosion of tubes
Large temperature differentials
Low pressure drop
High heat transfer co-efficient

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Heat Transfer
Vacuum is generally maintained in the vapour space of an evaporator mainly to

Facilitate forward feeding in multiple effect evaporation
Concentrate heat sensitive materials
Achieve very high concentration of the final product
Get economical temperature difference by using moderate pressure steam

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