Deck 7: Heat Exchangers

Question 1

Fouling resistance is determined by all of the following except:

A) type of fluid being handled
B) amount of suspended solids
C) tube and shell pressure rating
D) velocity of fluid stream

Answer 1

tube and shell pressure rating

Question 2

A device mounted on the inlet side of a shell and tube heat exchanger that is used to channel flow in a multipass heat exchanger.

A) head
B) longitudinal baffle
C) sectional head
D) channel head

Answer 2

channel head

Question 3

Laminar flow transfers heat more effectively than turbulent flow inside a heat exchanger.

Answer 3

False

Question 4

Internal buildup on the surface area of a heat exchanger that results in a restriction is referred to as:

A) plugging
B) fouling
C) scale
D) purging

Question 5

A type of heat exchanger that channels the tube-side flow across the tube bundle more than once.

A) multi-pass
B) u-tube
C) a & b
D) floating head
E) a & b & d

Question 6

What is the name of the metal plates located inside a shell and tube heat exchanger that are designed to increase turbulent flow and reduce hotspots.

A) vertical baffles
B) impingement baffle
C) longitudinal baffles
D) a & c
E) a & b & c

Question 7

All of the following are examples of heat transfer found in a heat exchanger except:

A) convection
B) conduction
C) sensible
D) radiant

Question 8

List the parts of a floating head heat exchanger.

Question 9

A term used to describe flow in a heat exchanger where tube-side flow and shell-side flow go in opposite directions.

A) cross flow
B) horizontal flow
C) parallel flow
D) counter flow

Question 10

On a simple shell and tube heat exchanger a process technician would close which of the following valves first.

A) tube inlet valve #1- process fluid 125 F
B) tube outlet valve #2- process fluid 325 F
C) shell inlet valve #3- steam
D) shell outlet valve #4- steam

Question 11

On a simple shell and tube heat exchanger a process technician would turn the device into a bomb if he closed which of the following valves first.

A) tube inlet valve #1- process fluid 125 F
B) tube outlet valve #2- process fluid 325 F
C) shell inlet valve #3- steam
D) shell outlet valve #4- steam

Question 12

The difference between inlet and outlet pressures is commonly referred to as:

A) differential pressure
B) approach to the exchanger
C) ∆ P (delta P)
D) a & c

Question 13

A term used to describe flow in a heat exchanger where tube-side flow and shell-side flow go in the same directions.

A) cross flow
B) horizontal flow
C) parallel flow
D) counter flow

Question 14

Plate and frame heat exchangers tend to foul easily because they have close clearances and low pressure drops across the plates.

Question 15

Plate and frame heat exchangers are easy to clean and have high heat transfer coefficients.

Question 16

A term used to describe flow in a heat exchanger where shell-side flow vertically crosses the horizontal tube flow.

A) cross flow
B) horizontal flow
C) parallel flow
D) counter flow

Question 17

Identify the major components of a kettle reboiler.

Question 18

Sudden temperature changes that results in the rapid expansion or contraction of metal.

A) thermal shock
B) fluid dynamics
C) warping
D) hydraulics

Question 19

A baffle that is designed to deflect high velocity fluids inside a heat exchanger.

A) longitudinal baffle
B) horizontal baffles
C) vertical baffles
D) impingement baffles

Question 20

A fin fan is an example of:

A) air cooled heat exchanger
B) water cooled heat exchanger
C) fin tube double-pipe
D) thermosiphon

Question 21

A type of heat exchanger that uses a tubular bundle to heat and flash a liquid in an over-sized shell with a vapor disengaging cavity.

A) kettle
B) thermosiphon
C) pot belly reboiler
D) a & c

Question 22

The tub head on a floating head heat exchanger is firmly attached to the tube sheet.

Question 23

Draw the simplest type of heat exchanger with the most efficient fluid flow design:

Question 24

Inside a tube with streamline fluid flow temperatures are relatively constant.

Question 25

The heat exchanger that is designed to take the highest flow rates and largest temperature differences is:

A) u-tube
B) plate and frame
C) double-pipe
D) fixed heads, multipass

Question 26

Draw a single-pass, shell and tube heat exchanger. Identify each component!

Question 27

Draw a U-tube heat exchanger. Do not list parts. Show flows

Question 28

A process technician can reduce fouling in a heat exchanger by: Select all that apply!

A) increasing fluid velocity
B) decreasing fluid velocity
C) lowering the temperature
D) increasing the temperature
E) removing inhibitors
F) adding inhibitors

Question 29

Draw the symbol for one cooling tower and four exchangers in parallel and series flow. Do not list components.

Question 30

Hairpin heat exchangers are typically as effective as most shell and tube heat exchangers.

Question 31

The basic components of a plate and frame heat exchanger include all of the following except:

A) carrying bar
B) moveable end cover
C) tube bundle sheet
D) plate stack
E) compression bolt
F) plate pack
G) hot fluid inlet
H) hot fluid outlet
I) fixed end plate
J) frame head

Question 32

A layer of fluid that tends to adhere to the walls of a heat exchanger is referred to as:

A) laminar adhesion
B) static film
C) crystallization
D) slack

Question 33

Heat exchanger effectiveness is linked to all of the following except:

A) cross sectional area
B) ∆p
C) flow rate
D) differential temperature
E) electromagnetic wave intensity

Question 34

Turbulent flow allows molecules of fluid to mix and absorb heat energy better than laminar but it enhances the stationary film along the shell and tube walls.

Question 35

Fins are added to tubes because:

A) thin material transfers heat better
B) fins create turbulence
C) fins enhance laminar flow
D) a & b

Question 36

Shell and tube nomenclature includes all of the following except:

A) cross flow
B) parallel
C) section
D) counter
E) divided
F) split

Question 37

A hairpin heat exchanger is an example of:

A) shell and tube heat exchanger
B) reboiler
C) double pipe
D) fin fan

Question 38

Heat exchangers can be found in all of the following categories except:

A) double-pipe
B) shell and tube
C) reboiler
D) plate and frame
E) air cooled
F) spiral
G) plate and packed

Question 39

Hairpin heat exchangers are relatively easy to clean and install.

Question 40

A shell and tube heat exchanger can be used to heat and cool a substance.

Question 41

Draw a plate and frame heat exchanger. Identify each component! Show all flows!

Question 42

Draw an air-cooled (fin fan )heat exchanger. Identify each component. Show all flows!