The shell side pressure drop in a shell and tube heat exchanger is maximum for __________ baffle.

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

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 case of a multipass shell and tube heat exchanger, providing a baffle on the shell side __________ the heat transfer rate.

A

Increases

B

Decreases

C

Does not affect

D

May increase or decrease, depends on the type of baffle

Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle?

A

Segmental baffle

B

Flat plate extending across the wall

C

Disk type baffle

D

Helical type baffle

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

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 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

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

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