Heat Transfer
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Finned tube heat exchanger with air outside and steam inside
Shell and tube heat exchanger with air inside tubes and steam on shell side
Finned tube heat exchanger with air inside and steam outside
Shell and tube heat exchanger with air on shell side and steam inside tubes

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Heat Transfer
In sub-cooled boiling,

Bubbles from heating surface are absorbed by the mass of the liquid
Temperature of the heating surface is more than the boiling point of the liquid
Very large vapour space is necessary
Temperature of the heating surface is less than the boiling point of the liquid

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