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Heat exchanger
• A heat exchanger is a piece of equipment
built for efficient heat transfer from one
medium to another.
• They are widely used in space heating,
refrigeration, air conditioning, power plants,
chemical plants, petrochemical plants, petroleum
refineries, natural gas processing and sewage
treatment.
Flow
arrangement
• In parallel-flow heat exchangers, the two fluids
enter the exchanger at the same end, and travel
in parallel to one another to the other side.
• In counter-flow heat exchangers the fluids enter
the exchanger from opposite ends. The counter
current design is the most efficient.
• In a cross-flow heat exchanger, the fluids travel
roughly perpendicular to one another through the
exchanger.
Types of Heat Exchanger
1. Double pipe heat
exchanger
2. Shell and tube heat
exchanger
3. Plate heat exchanger
4. Spiral heat
exchangers
Double pipe heat
exchanger:
• It is also known as concentric tube
• heat exchanger
• In this heat exchanger the fluid to be cooled or
heated passes through the tube 2(green) and
the other fluid is passed through tube 1 (red)to
absorb or release the heat.
•Advantages: Cheap for both design and
maintenance.
•Disadvantages: Low efficiency and requires
large space.
Application
• Pasteurization
• Digester heating
• Heat recovery
• Pre-heating
• Effluent cooling.
Shell and tube heat exchanger
• One set of these tubes contains the fluid that must be
either heated or cooled. The second fluid runs over the
tubes that are being heated or cooled so that it can either
provide the heat or absorb the heat required.
• They are typically used for high pressure
applications.(above 30 bars)
Application
• Cooling of hydraulic fluid.
• Cooling of engine oils.
• Cool or heat swimming pool water
or charged air
Plate heat exchanger
• It is composed of multiple, thin, slightly separated
plates that have very large surface areas and fluid
flow passages for heat transfer.
• The plates are often spaced by rubber sealing gaskets
which are cemented into a section around the edge of
the plates. The plates are pressed to form troughs at
right angles to the direction of flow of the liquid which
runs through the channels in the heat exchanger.
These troughs are arranged so that they interlink with
the other plates which forms the channel with gaps of
1.3– 1.5 mm between the plate.
• The plates can be replaced after getting corroded.
• If the temperature difference to be accquired is to be
increased then
Application
• Water heaters
• Cooling tower
isolation
• Free cooling
• Waste heat recovery
• Heat pump isolation
• Thermal (ice) storage
systems
Spiral heat exchangers
• A spiral heat exchanger (SHE), may refer to a
helical (coiled) tube configuration
• Efficient use of space.
• They can be easily cleaned.
• A Spiral Heat Exchangers (or SHE) is a coiled tube
arrangement, with two channels coiled one
around the another. These two channels operate
in a counter-flow arrangement, offering excellent
turn down ratios, while optimizing flow patterns
which in turn, enhance heat transfer.
Fig. Spiral heat
exchanger
Application
• Pasteurization
• Recuperators (Exhaust and Air
Handling Systems)
• Sludge Treatment (Thermal
depolymerisation)

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Module 4.2 Heat Exchangers.pptx

  • 1.
  • 2. Heat exchanger • A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. • They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural gas processing and sewage treatment.
  • 3. Flow arrangement • In parallel-flow heat exchangers, the two fluids enter the exchanger at the same end, and travel in parallel to one another to the other side.
  • 4. • In counter-flow heat exchangers the fluids enter the exchanger from opposite ends. The counter current design is the most efficient.
  • 5. • In a cross-flow heat exchanger, the fluids travel roughly perpendicular to one another through the exchanger.
  • 6. Types of Heat Exchanger 1. Double pipe heat exchanger 2. Shell and tube heat exchanger 3. Plate heat exchanger 4. Spiral heat exchangers
  • 7. Double pipe heat exchanger: • It is also known as concentric tube • heat exchanger • In this heat exchanger the fluid to be cooled or heated passes through the tube 2(green) and the other fluid is passed through tube 1 (red)to absorb or release the heat. •Advantages: Cheap for both design and maintenance. •Disadvantages: Low efficiency and requires large space.
  • 8. Application • Pasteurization • Digester heating • Heat recovery • Pre-heating • Effluent cooling.
  • 9. Shell and tube heat exchanger • One set of these tubes contains the fluid that must be either heated or cooled. The second fluid runs over the tubes that are being heated or cooled so that it can either provide the heat or absorb the heat required. • They are typically used for high pressure applications.(above 30 bars)
  • 10. Application • Cooling of hydraulic fluid. • Cooling of engine oils. • Cool or heat swimming pool water or charged air
  • 11. Plate heat exchanger • It is composed of multiple, thin, slightly separated plates that have very large surface areas and fluid flow passages for heat transfer. • The plates are often spaced by rubber sealing gaskets which are cemented into a section around the edge of the plates. The plates are pressed to form troughs at right angles to the direction of flow of the liquid which runs through the channels in the heat exchanger. These troughs are arranged so that they interlink with the other plates which forms the channel with gaps of 1.3– 1.5 mm between the plate. • The plates can be replaced after getting corroded. • If the temperature difference to be accquired is to be increased then
  • 12.
  • 13. Application • Water heaters • Cooling tower isolation • Free cooling • Waste heat recovery • Heat pump isolation • Thermal (ice) storage systems
  • 14. Spiral heat exchangers • A spiral heat exchanger (SHE), may refer to a helical (coiled) tube configuration • Efficient use of space. • They can be easily cleaned. • A Spiral Heat Exchangers (or SHE) is a coiled tube arrangement, with two channels coiled one around the another. These two channels operate in a counter-flow arrangement, offering excellent turn down ratios, while optimizing flow patterns which in turn, enhance heat transfer.
  • 16. Application • Pasteurization • Recuperators (Exhaust and Air Handling Systems) • Sludge Treatment (Thermal depolymerisation)