Process Equipment and Plant Design
Floating head heat exchangers are used for the

Co-current heat transfer systems
Counter-current heat transfer systems
Cases where temperature difference between the shell and the tubes is more (>50°C)
Heat transfer between corrosive fluids

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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

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

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