Heat Transfer
One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to

Heat the water from 0°C to 100°C
To superheat the steam
Evaporate the water
Data insufficient, can

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Heat Transfer
Finned tube heat exchangers

facilitate very large temperature drop through tube wall
use metal fins of low thermal conductivity
are used for smaller heat load
give larger area per tube

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