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 for smaller total pressure drop
Shell side for large overall heat transfer co-efficient
Shell side, if the flow is counter-current and tube side if the flow is co-current

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Process Equipment and Plant Design
In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference

Is always less than arithmetic average value
May be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current
Is always less than arithmetic mean value, but more than geometric mean value
Is always more than arithmetic mean value and the geometric mean value

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