Classification of Heat Exchangers

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Classification of Heat Exchangers

• P M V Subbarao
• Professor
• Mechanical Engineering Department
• I I T Delhi

Creation of Variety in Anatomy of Heat
Exchanger!!!
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Time /Space Sharing
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Real Need Cool or heat a Fluid

• Auxiliaries Solid Surface Another fluid
  (plentiful)
• Essential Some source of Energy (Motive Power)
• More Green Methods..
• Traditional Egyptian architecture in Ancient
  Egypt as demonstrated on the Pharonic house of
  Neb- Ammun, Egypt, 19th Dynasty, c.1300 BC.
• Persian ??????? bâdgir bâd "wind" gir
  "catcher
• Arabic ???? ?malqaf
• Eastern Arabia?????? barjeel

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Windcatcher (Bagdir)
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Degree of Greenness
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Geometrical Ideas for Classification
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Regenerators
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Relative Direction of Flows
Scalar HX to Vector Hx
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Economy of Metal Usage
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Geometrical Modifications for Better Economy
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Expenditure in A Heat Exchanger

• The capital investment on Heat exchanger material
  is proportional to double the Heat transfer Area.
• Investment on both cold side and hot side of a
  heat exchanger for a given surface area of heat
  exchanger.
• Another expenditure is running cost or
  operational cost.
• Main operation cost is pumping power cost.
• This again increases the size of the pump and
  capital cost.
• This arises a question of inner and outer flow
  pressure drop calculations and a suitable
  innovation for the same.
• Engineering world is like an incandescent lamp.

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Two inner tubes and one outer tube
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Differential Element Analysis
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Heat lost by hot fluid