POWER ENGINEER 3B2 CHAPTER 12
EXAM QUESTIONS AND ANSWERS.
VERIFIED 2026.
Double pipe heat exchanger - ANS pipe within a larger pipe
co-current flow or counter-current
1. concentric pipe, inner pipe may with pin or stud
2. hairpin (serpentine) exchanger
double pipe advantage - ANS 1. simple construction
2. suitable for high pressure
3. flexibility of configuration
4. simple maintenance and replacement
5. compactness, less floor space
6, suit for both fluid require temperature change
con: high number of joints, possible leak
shell and tube - ANS most common design
large area for heat transfer
can be constructed for high temperature and high pressure
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, . U-tube
. floating head
. Fixed tube
U-tube - ANS 1. one tube joint to shell, eliminate thermal expansion problem
2. tube bundle can be separated from shell
con: reduction of heating surface
always have fouling fluid on shell side
fixed head - ANS 1. simplicity of design, easy fab
2. tube maintenance easy
3. flexibility in design
con
1. expansion stress
2. shell side maintenance difficult
3. cleaner fluid in shell side
baffles - ANS direct shell fluid flow over tube for heat exchange
flat plate
.segmental baffle
.annular ring baffle
reboiler - ANS shell tube heat exchanger in gas processing and petro-chemical plant
steam in tube side, boil shell side liquid
.kettle
.thermosyphon horizontal
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
EXAM QUESTIONS AND ANSWERS.
VERIFIED 2026.
Double pipe heat exchanger - ANS pipe within a larger pipe
co-current flow or counter-current
1. concentric pipe, inner pipe may with pin or stud
2. hairpin (serpentine) exchanger
double pipe advantage - ANS 1. simple construction
2. suitable for high pressure
3. flexibility of configuration
4. simple maintenance and replacement
5. compactness, less floor space
6, suit for both fluid require temperature change
con: high number of joints, possible leak
shell and tube - ANS most common design
large area for heat transfer
can be constructed for high temperature and high pressure
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, . U-tube
. floating head
. Fixed tube
U-tube - ANS 1. one tube joint to shell, eliminate thermal expansion problem
2. tube bundle can be separated from shell
con: reduction of heating surface
always have fouling fluid on shell side
fixed head - ANS 1. simplicity of design, easy fab
2. tube maintenance easy
3. flexibility in design
con
1. expansion stress
2. shell side maintenance difficult
3. cleaner fluid in shell side
baffles - ANS direct shell fluid flow over tube for heat exchange
flat plate
.segmental baffle
.annular ring baffle
reboiler - ANS shell tube heat exchanger in gas processing and petro-chemical plant
steam in tube side, boil shell side liquid
.kettle
.thermosyphon horizontal
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
