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 having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)
A $$\frac{{4\left( {{{\text{p}}^2} - \pi {{\text{d}}^2}/4} \right)}}{{\pi {\text{d}}}}$$
B $$\frac{{{{\text{p}}^2} - \pi {{\text{d}}^2}/4}}{{\pi {\text{d}}}}$$
C $$\frac{{4{{\text{p}}^2}}}{{\pi {\text{d}}}}$$
D $$\frac{{\pi {\text{d}}}}{{4{{\text{p}}^2}}}$$
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
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger
A Permits the use of less tubes in a given shell diameter
B Facilitates comparatively easier external cleaning because of large clearance
C Permits the use of more tubes in a given shell diameter
D Both B and C
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
In a shell and tube heat exchanger, square pitch compared to triangular pitch
A Gives a higher shell side pressure drop
B Gives a lower shell side pressure drop
C Can pack more surface area into a shell of given diameter
D Both (A) and (B)
E Both (A) and (C)
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
In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by
A $$\frac{{4\left( {0.86{{\text{p}}^2} - \pi {{\text{d}}^2}/4} \right)}}{{\pi {\text{d}}}}$$
B $$\frac{{{{\text{p}}^2} - \pi {{\text{d}}^2}/4}}{{\pi {\text{d}}}}$$
C $$\frac{{4\left( {0.86{{\text{p}}^2} - \pi {{\text{d}}^2}} \right)}}{{\pi {\text{d}}}}$$
D $$\frac{{4{{\text{p}}^2} + \pi {{\text{d}}^2}/4}}{{\pi {\text{d}}}}$$
In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm.
A 3-5
B 5-11
C 8-15
D 12-18
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

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