Process Equipment and Plant Design
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes

Are less prone to fouling
None of these
Are easier to clean
Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.

Tube dia is 3-6 cms, while tube length in 3-6 metres
None of these
Steam is fed to the shell, whereas the liquor is filled inside the tube
Liquor level is maintained at l/3rd to 1/2 of the height of the tube

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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
Tubes to avoid the expansion of high pressure shell construction
Shell side for large overall heat transfer co-efficient
Shell side for smaller total pressure drop

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