Process Equipment and Plant Design
When one of the fluids is highly corrosive and has fouling tendency, it should

Preferably flow inside the tube for its easier internal cleaning
Perferably flow outside the tube
Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current
Flow at a very slow velocity

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

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

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