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Classification Of Heat Exchangers

Classification Of Heat Exchangers. Presenters:. Muhammad Khuram 2007-Chem-45 Muhammad Shafiq Asif 2007-Chem-23. Heat Exchanger:. Definition:

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Classification Of Heat Exchangers

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  1. engineering-resource.com

  2. Classification Of Heat Exchangers engineering-resource.com

  3. Presenters: • Muhammad Khuram 2007-Chem-45 • Muhammad ShafiqAsif 2007-Chem-23 engineering-resource.com

  4. Heat Exchanger: Definition: • A device that is used to transfer thermal energy (enthalpy) between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid, at different temperature and in thermal contact. engineering-resource.com

  5. Classification: Heat exchangers are classified according to: • Transfer processes • Number of fluids • Degree of surface compactness • Construction features • Flow arrangements • Heat transfer mechanism engineering-resource.com

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  7. Indirect –Contact Heat Exchanger: In this , the fluid streams remain separate and the heat transfers continuously through an dividing wall into and out of the wall in a transient manner. engineering-resource.com

  8. Types of Indirect Heat exchanger: • Direct transfer type heat exchanger • Storage type heat exchanger • Fluidized bed heat exchanger engineering-resource.com

  9. Direct Transfer Type HE: • In this, type heat transfers continuously from the hot fluid to the cold fluid through a dividing wall. • It is also known as recuperator. engineering-resource.com

  10. Storage Type HE: • In this, both fluids flow alternatively through the same flow passage, and hence heat transfer is intermittent. engineering-resource.com

  11. Fluidized Bed HE: • In a fluidized bed HE, one side of two fluids is immersed in a bed of finely divided solid material. engineering-resource.com

  12. Direct-Contact Exchanger: In a direct-contact HE, two fluid streams come into direct contact, exchange heat, and are then separated. Types: • Immiscible fluid exchanger • Gas-Liquid exchanger • Liquid-Vapor exchanger engineering-resource.com

  13. Advantages: In direct-contact HE: • Very high heat transfer rates are achieved. • Construction is inexpensive. • The fouling problem is generally non-existing because non dividing wall is present. engineering-resource.com

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  15. Surface Compactness: Ratio of heat transfer surface area to volume of the heat exchanger. engineering-resource.com

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  17. Double Pipe HE: This exchanger usually consists of two concentric pipes with the inner pipe plain or finned. engineering-resource.com

  18. Shell & Tube HE: • This exchanger is generally built of a bundle of round tubes mounted in a cylindrical shell with the tube axis parallel to that of shell. • One fluid flows inside the tubes, the other flows across and along the tubes. engineering-resource.com

  19. Diagram: Shell & Tube Exchanger with one shell pass and one tube pass engineering-resource.com

  20. Shell & Tube Exchanger with one shell pass and two tube passes engineering-resource.com

  21. Spiral Heat Exchanger: engineering-resource.com

  22. Lamella Heat Exchanger: • A lamella HE consists an outer tubular shell surrounding an inside bundle of heat transfer elements. • These elements, referred to as lamellas, are flat tubes. engineering-resource.com

  23. Diagram: engineering-resource.com

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  25. Counter Flow HE: • In a counter flow exchanger, the two fluids flow parallel to each other but in opposite directions within the core. engineering-resource.com

  26. Co-current HE: • In a co-current HE, the fluid streams enter together at one end, flow parallel to each other in the same direction, and leave together at the other end. engineering-resource.com

  27. Cross Flow HE: • In this type of exchanger, the two fluids flow in directions normal to each other. engineering-resource.com

  28. Multipass Cross Flow HE: engineering-resource.com

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