Related Questions

Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
A Finned tube heat exchanger with air inside and steam outside
B Finned tube heat exchanger with air outside and steam inside
C Shell and tube heat exchanger with air inside tubes and steam on shell side
D Shell and tube heat exchanger with air on shell side and steam inside tubes
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is
A Infinity
B Zero
C Same as average heat transfer co-efficient for tube side
D None of these
For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it
A Decreases the pressure drop
B Decreases the outlet temperature of cooling medium
C Increases the overall heat transfer coefficient
D None of these
In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used
A In low range of temperature differences
B In high range of temperature differences
C Because of its low cost
D To prevent corrosion of the tube bundles
In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement
A Results in higher shell side pressure drop
B Can accomodate less number of tubes for a given shell diameter
C Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid
D Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient
A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires
A Less heating surface
B More space
C Lower maintenance cost
D None of these
Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling?
A Square pitch
B Triangular pitch
C Diagonal square pitch
D None of these
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
A Increases
B Decreases
C Remains constant
D Passes through a maxima
In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.
A Once
B Twice
C Thrice
D Four times
For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of
A 1
B 1.74
C 6.1
D 37

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