Heat Exchangers
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  • I agree with the other comments, this is indeed a great presentation. I would like to add that Gur Technologies are a great company and are experts in making the most out of HVAC systems. By using their products to keep your system clean and working, you can make a lot out of it. for more info, contact Andrew@Gur Technologies, he is a real expert, or visit their site at http://gur-technologies.com/vmchk/Indoor-Air-Quality/View-all-products.html
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  • This was very helpful. I just bought my first house and my heater doesn't work and I wanted to get it fixed now before I am really going to need it. I was told me heat exchanger was broken and I needed new FEP tubing. I don't know what any of that is so I have been doing research, that is how I ended up here. This really helped explain what a heat exchanger is, thanks so much for sharing.
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  • good. and also reuired some technical calculation for choosen the heat exchager
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  • Nice this presentation
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  • nice presentation
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Heat Exchangers Presentation Transcript

  • 1. Heat Exchangers
  • 2. Heat Exchangers
    • Heat exchangers are one of the most common pieces of equipment found in all plants.
    • 3. Heat Exchangers are components that allow the transfer of heat from one fluid (liquid or gas) to another fluid.
    • 4. In a heat exchanger there is no direct contact between the two fluids. The heat is transferred from the hot fluid to the metal isolating the two fluids and then to the cooler fluid.
  • Types of Heat Exchangers
  • 5. Double-Pipe Exchanger
  • 6. Double Pipe
    Simplest type has one tube inside another - inner tube may have longitudinal fins on the outside
    However, most have a number of tubes in the outer tube - can have very many tubes thus becoming a shell-and-tube
  • 7. Shell-and-Tube Heat Exchanger
  • 8. Shell-and-Tube Heat Exchangers are the most important type of HE.
    It is used in almost every type of industry.
    This type of heat exchanger consists of a set of tubes in a container called a shell.
    The fluid flowing inside the tubes is called the tube side fluid and the fluid flowing on the outside of the tubes is the shell side fluid.
  • 9. Main Components of Shell-and-Tube Heat Exchangers
  • 10. Some common heat-exchanger terms
    Tube side: Inside the tubes.
    Shell side: Outside the tubes, between the tubes and the shell.
    Tube sheet A thick plate provided with holes (one per tube) in which the tubes are fixed.
    Tube bundle Consists of tubes, tube sheet and baffle plates
    Shell A cylinder of plate in which the tube bundle is placed
  • 11.
  • 12. TEMA Heat Exchangers
  • 13. Shell and Tube Heat Exchangers Construction
    Fixed Tube-sheet type
    U-tube type
    Floating Head type
  • 14. Front head type
    A-type
    B-type
    B
    A
    Channel and removable cover
    Bonnet (integral cover)
  • 15. Shell type
    E-type
    F shell
    Longitudinal baffle
    F
    E
    One-pass shell
    Two-pass shell
  • 16. More shell types
    G and H shells normally only used for horizontal thermosyphon reboilers
    J and X shells if allowable pressure drop can not be achieved in an E shell
    G
    H
    Longitudinal
    baffles
    Split flow
    Double split flow
    J
    X
    Divided flow
    Cross flow
  • 17. Low-finned Tubes
    Flat end to go into tube sheet and intermediate flat portions for baffle locations
    Available in variety of metals including stainless steel, titanium and inconels
  • 18. Plate and frame
    Plates hung vertically and clamped in a press or frame.
    Gaskets direct the streams between alternate plates and prevent external leakage
    Plates made of stainless steel or higher quality material
    Plates corrugated to give points of support and increase heat transfer
  • 19. Plate Heat Exchanger
  • 20. Corrugations on plate
    improve heat transfer
    give rigidity
    Many points of
    contact and a
    tortuous flow path
    Chevron
    Washboard
    Plate types
  • 21. General view of plate exchanger
    “Plate exchanger” normally refers to a gasketed plate- and-frame exchanger
  • 22. Flow Arrangement within a PHE
    Gaskets
    arranged for
    each stream to
    flow between
    alternate plates
    Alternate plates (often same plate types inverted)
  • 23. Air-Cooled or Fin-Fan Exchanger
  • 24. Air-cooled exchanger
    Air blown across finned tubes (forced draught type)
    Can suck air across (induced draught)
    Finned tubes
  • 25. ACHE bundle
  • 26. Spiral Heat Exchanger
  • 27. Spiral Heat Exchangers
    Spiral heat exchangers can be used in most applications in the chemical process industry
    In many difficult applications where fouling and plugging are problems, a standard shell and tube design may not be effective
    While a spiral heat exchanger often has a higher initial cost, it may provide a lower life cycle cost due to lower fouling rates and ease of maintenance
  • 28. A spiral heat exchanger is composed of two long, flat plates wrapped around a mandrel or center tube, creating two concentric spiral channels
    In a spiral heat exchanger, the hot fluid flows into the center of the unit and spirals outward toward the outer plates while at the same time, the cold fluid enters the periphery and spiral inward, exiting at the center