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Heat Transfer

Q1: Pick out the wrong statement.

A By increasing the number of shell passes, the temperature cross in a shell and tube heat exchanger can be prevented.

B An underdesigned steam trap will back up the condensate instead of discharging it out.

C Steam condensate is corrosive because of the presence of dissolved oxygen in it.

D Film boiling is desirable in commercial equipments due to high heat transfer rate at low temperature drop.

ANS:D - Film boiling is desirable in commercial equipments due to high heat transfer rate at low temperature drop.

The wrong statement is: "Film boiling is desirable in commercial equipment due to high heat transfer rate at low temperature drop." Film boiling is not desirable in commercial equipment due to its low heat transfer coefficient and high temperature drop. It is characterized by the formation of a vapor film on the surface, which insulates the surface from the bulk fluid, reducing heat transfer efficiency. Therefore, film boiling is generally avoided in commercial equipment whenever possible.



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