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

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Process Equipment and Plant Design
High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

Shell side, if the flow is counter-current and tube side if the flow is co-current
Shell side for smaller total pressure drop
Tubes to avoid the expansion of high pressure shell construction
Shell side for large overall heat transfer co-efficient

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