Process Equipment and Plant Design
Fouling factor must be included in the calculation of over all design heat transfer coefficient, when the liquid

Containing suspended solids flows at high velocity
Is highly viscous
Containing suspended solids flows at low velocity
Is of high specific gravity

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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

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

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