Heat Transfer
The advantage of backward feed multiple effect evaporators over forward feed units is that

Equal heat transfer co-efficients exist in various effects
Heat sensitive material can be handled
Most concentrated liquid is at highest temperature
There is no additional cost of pumping

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Heat Transfer
Water always boils when its

Vapour pressure equals 76 cm of Hg
Saturated vapour pressure is less than the atmospheric pressure
Temperature reaches 100° C
Saturated vapour pressure equals the external pressure on its surface

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