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

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

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Heat Transfer
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Higher condensing film co-efficient is desired
Lower pressure drop through the exchanger is desired
Condensate is corrosive in nature
Temperature of the incoming vapor is very high

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