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Double pipe heat exchanger

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  • 1. Double pipe heat exchanger• Two sets of concentric pipes, two connecting tees, and a return head and a return bend.• A device whose purpose is the transfer of thermal energy between two fluids.• Heat Exchanger-HX• Common applications: Boilers, Coolers, Condensers, Evaporators.• Common design consists of tow fluids separated by a conducting medium.
  • 2. Classification Heat transfer mechanism Degree of surface compactness Heat transfer type Flow arrangement Number of passes Construction
  • 3. Classification Direct contact type: Cooling towers, Spray towers Indirect contact type Cooling tower Spray tower
  • 4. Classification Single Pass arrangement Multiple pass arrangement
  • 5. Classification The choice of a particular flow arrangement depends upon the required heat exchanger effectiveness, fluid flow paths, allowable thermal stresses, temperature levels and other design criteria. Heat exchangers may be classified according to their flow arrangement. • Parallel-flow • Counter-flow • Cross-flow • Divided-flow • Split-flow
  • 6. Classification
  • 7. Classification The heat exchangers classify based on geometry of construction are, • Plate Heat Exchangers • Extended surface Heat Exchangers • Tubular Heat Exchangers
  • 8. Classification Plate Heat Exchanger • Limited to below 25 bar and 2500C • Plate heat exchangers have three main types : gasketed ,spiral and lamella heat exchangers. • The most common of the plate-type heat exchangers is the gasketed plate heat exchanger
  • 9. ClassificationPlate type heat exchanger
  • 10. ClassificationSpiral heat exchanger
  • 11. Classification
  • 12. Classification Plate Heat Exchanger  Aadvantages • Plate heat exchangers yield heat transfer rates three to five times greater than other types of heat exchangers. • The design of the plate heat exchanger allows to add or remove plates to optimize performance, or to allow for cleaning, service, or maintenance. • Plate exchangers offer the highest efficiency mechanism for heat transfer available in industry.
  • 13. Classification Plate Heat Exchanger  Disadvantages • Plate exchangers are limited when high pressures, high temperatures, or aggressive fluids are present. • Because of this problem these type of heat exchangers have only been used in small, low pressure applications such as on oil coolers for engines.
  • 14. Classification Extended surface heat exchangers • Plate fin heat exchanger • Tube fin heat exchanger Tube fin exchanger Plate fin exchanger
  • 15. Classification
  • 16. Classification
  • 17. Classification Tubular heat exchanger• Material and design development• Widely used• No limit to range of temperatures and pressures• Two types 1. Double pipe heat exchanger 2. Shell and tube heat exchanger
  • 18. Classification Double pipe heat exchangerThey consist of one pipe concentrically located inside asecond larger pipe. Double pipe exchanger
  • 19. Classification Phase change heat exchangers• Condensers(water cooled, air cooled)• Reboilers• Evaporators Induced draftForced draft Air cooled condenser
  • 20. Classification Phase change heat exchangers Water cooled condenser
  • 21. Classification Area density: Ratio of heat transfer area to the volume of heat exchanger Compact Heat exchanger • Area density greater than 700 m2/m3 or 213 ft2/ft3 or hydraulic diameter ≤ ¼ inch for gas stream. • Area density greater than 400 m2/m3 or 122 ft2/ft3 for liquid stream). Non-compact Heat exchanger • Area density less than 700 m2/m3 for gas stream. • Area density less than 400 m2/m3 for liquid stream.
  • 22. Classification
  • 23. Thank You forYour Attention