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 $$\frac{{4{{\text{p}}^2} + \pi {{\text{d}}^2}/4}}{{\pi {\text{d}}}}$$

Correct Answer: $$\frac{{4\left( {0.86{{\text{p}}^2} - \pi {{\text{d}}^2}/4} \right)}}{{\pi {\text{d}}}}$$

Bissoy MCQ
#Chemical Engineering #Process Equipment And Plant Design

Related Questions

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 $$\frac{{\pi {\text{d}}}}{{4{{\text{p}}^2}}}$$
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
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
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
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
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
Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is
A More
B Same
C Less
D Twice
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
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes
A Are easier to clean
B Are less prone to fouling
C Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
D None of these

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