Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to

The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than $${\frac{1}{5}^{{\text{th}}}}$$ the I.D. of the shell. Which of the following is not a function of the baffles?

A

To increase the residence time of shell side fluid

B

To provide support to the tube bundle

C

To reduce the induced vibration in the tubes

D

To increase the tube side heat transfer co-efficient by inducing turbulence

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

Plate type heat exchangers have less surface area as compared to a similar Shell and Tube heat exchanger. A Shell and Tube Heat Exchanger of equivalent area weigh six-seven times less than a Plate Type heat exchanger.

A

True

B

False

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)

A

0.2 D

B

0.5 D

C

0.66 D

D

0.80 D

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter )

A

0.2 D

B

0.5 D

C

0.66 D

D

0.80 D

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

A single pass shell and tube heat exchanger, consisting of a bundle of 100 tubes (inner diameter 25 mm and thickness 2 mm) is used for heating 28 kg/s of water from 25 degree Celsius to 75 degree Celsius with the help of a steam condensing at atmospheric pressure on the shell side with condensing heat transfer coefficient 5000 W/m2 degree. Make calculation for overall heat transfer coefficient based on the inner area. Take fouling factor on the water side to be 0.002 m2 degree/W per tube and neglect effect of fouling factor on the shell side and thermal resistance of the tube wall

A

647.46 W/m2 degree

B

747.46 W/m2 degree

C

847.46 W/m2 degree

D

947.46 W/m2 degree

In case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell)

A

$$\frac{{\text{D}}}{5}$$ and D

B

$$\frac{{\text{D}}}{2}$$ and 2D

C

$$\frac{{\text{D}}}{4}$$ and 2D

D

D and 2D

If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid

A

Remains unchanged

B

Increases

C

Increases or decreases depending on number of shell passes

D

Decreases

If 'D' is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of

A

D/2 or minimum 2" to 5D

B

D/5 or minimum 2" to 5D

C

D/5 or minimum 2" to D

D

None of these

Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to

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