Heat Transfer
In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will

Either increase or decrease; depends on the coolant flow rate
Remain unchanged
Increase
Decrease

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Heat Transfer
Finned tube heat exchangers

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

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