Heat Exchangers: Applications &...
Transcript of Heat Exchangers: Applications &...
Heat Exchangers: Applications & Classifications
Dr. Md. Zahurul Haq
ProfessorDepartment of Mechanical Engineering
Bangladesh University of Engineering & Technology (BUET)Dhaka-1000, Bangladesh
[email protected]://teacher.buet.ac.bd/zahurul/
ME 307: Heat Transfer Equipment Design
http://teacher.buet.ac.bd/zahurul/ME307/
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Applications of Heat Exchangers
Applications of Heat Exchangers
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Components of a simple vapour power plant
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Applications of Heat Exchangers
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Components of a boiler
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Applications of Heat Exchangers
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Gas turbine with inter-cooling, reheat and regeneration
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Applications of Heat Exchangers
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Combined cycle power plant.
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Applications of Heat Exchangers
T110 T142
Refrigerators.
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Applications of Heat Exchangers
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Solar-thermal vapour absorption refrigeration system.
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Applications of Heat Exchangers
Applications of HTX Technologies
T729
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Applications of Heat Exchangers
Heat Exchangers (HTXs) are devices that facilitate transfer of
heat between two or more fluids a different temperatures.
HTX final design:
heat transfer and pressure drop analysis,
sizing and performance analysis,
economic aspect.
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Classification of Heat Exchangers
Classification of Heat Exchangers
A. Classification by Transfer Processes:
1 Direct contact e.g. cooling tower
2 Indirect contact e.g. shell-tube HTX
B. Classification by Construction Type:
1 Tubular HTX
Double-pipe HTX
Shell-and-tube HTX
Spiral-tube-type HTX
2 Plate HTX
Gasketed plate HTX
Spiral plate HTX
3 Extended surface HTX
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Classification of Heat Exchangers
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Counterflow and parallel-flow configurations for double-pipe heat
exchangers.
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Classification of Heat Exchangers
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1-tube pass and 2-tube pass STHXs.
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Classification of Heat Exchangers
T733
T736
Gascated plate HTX.
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Classification of Heat Exchangers
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T732
Spiral-plate HTX.
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Classification of Heat Exchangers
C. Classification by Flow Arrangement:
1 Parallel-flow
2 Counter-flow
3 Cross-flow
4 Multipass-flow
D. Classification by Heat Transfer Mechanism:
1 Single phase, free or forced convection
2 Phase change, boiling or condensation
3 Radiation or combined radiation and convection
E. Compact Heat Exchangers:
Compact HTX, if surface area density > 700 m2/m3.
Automotive HTX: 1100 m2/m3.
Human lungs: 20000 m2/m3.
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Classification of Heat Exchangers HTX: Examples
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Parallel-flow and Counter-flow HTX
T725
Cross-flow HTX
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Classification of Heat Exchangers HTX: Examples
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A shell-and-tube heat exchanger (one-shell pass and one-tube pass).
T727 T728
Multipass flow arrangements in shell-and-tube heat exchangers.
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Classification of Heat Exchangers HTX: Examples
HTX: Direct Contact
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Fluid-fluid direct-contact exchangers where one phase can dissolve in the
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Classification of Heat Exchangers HTX: Examples
HTX: (a) Recuperator / (b) Regenerator
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Recuperator: Hot and cold fluids are separated by surfaces, and heat is
transferred by combination of convection to and from the
walls and conduction through the walls.
Regenerator: Hot and cold fluids alternatively occupy the same space
in the exchange core (matrix). Matrix serves as the heat
storage device that is periodically heated by the warmer
fluid and then transfers heat to the cold fluid.
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Classification of Heat Exchangers HTX: Examples
HTX: Regenerator
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Heat regenerators or heat storing exchangers: (a) Heat storing solids are
stationary; (b) heat storing solids continuously circulate between hot and
cold streams
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Classification of Heat Exchangers HTX: Examples
Compact HTX
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Compact heat exchanger cores. (a) Fin-tube (flat tubes, continuous plate
fins). (b) Fin-tube (circular tubes, continuous plate fins). (c) Fin-tube
(circular tubes, circular fins). (d) Plate-fin (single pass). (e ) Plate-fin
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Classification of Heat Exchangers HTX: Examples
HTX: Heat Pipe
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The heat pipe transfers heat from one place to another, often far apart.
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