Heat Transfer
Indirect contact heat exchangers are preferred over direct contact heat exchangers, because

There is no mist formation
Heat transfer co-efficient are high
Cost of equipment is lower
There is no risk of contamination

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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

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

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Heat Transfer
Steam trap is used to

None of these
Condense the steam flowing in the pipeline
Stop the supply of steam
Remove water resulting from partial condensation of steam

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