Process Equipment and Plant Design
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

Sensible heat differences are small, because the temperature changes from tray to tray is small
Trouton's rule is applicable
Liquid/vapor loading across the column remains constant
All of these

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Process Equipment and Plant Design
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Both the functions of condensation & sub cooling are carried out in a single unit
Only the function of condensation is to be carried out
Hydrostatic head is required for refluxing the condensate
Sub cooling of condensate is desired

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