3B2 Ch 12

Question 1

Concentric pipe heat exchangers:
Select one:

a.
Typically use concurrent flows

b.
Always use a smooth bore annulus

c.
Are bulky

d.
Always use consecutive flows

e.
Are used for low heat duties

Answer 1

e.
Are used for low heat duties

Question 2

Which of the following are true of the fixed tubesheet, shell-and-tube exchanger?
1. Has a tube pattern that can fill the shell
2. Has tubesheets welded to the shell
3. Tubesheets can extend past the shell for bolting up
4. The design allows for differences in thermal expansion between the shell and tube bundle
5. Allows brush cleaning
Select one:

a.
1, 2, 3, 4

b.
2, 3, 4, 5

c.
1, 2, 3, 5

d.
1, 2, 4, 5

e.
1, 2, 3, 4, 5

Answer 2

c.
1, 2, 3, 5

Question 3

Which of the following are true for plate heat exchangers?
1. High turbulence helps prevent fouling
2. Heat transfers well through the thin plates
3. They are not good for thick fluids
4. They have a low-pressure drop
5. Gasket placement is critical
Select one:

a.
1, 2, 3, 4

b.
2, 3, 4, 5

c.
1, 3, 4, 5

d.
1, 2, 4, 5

e.
1, 2, 3, 5

Answer 3

e.
1, 2, 3, 5