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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Presentation transcript:

Classification of Heat Exchangers P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Creation of Variety in Anatomy of Heat Exchanger!!!

Time /Space Sharing

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: بادگیر‎ bâdgir: bâd "wind" + gir "catcher“ Arabic: ملقف ‎malqaf Eastern Arabia:بارجيل barjeel

Windcatcher (Bagdir)

Degree of Greenness

Geometrical Ideas for Classification

Regenerators

Relative Direction of Flows Scalar HX to Vector Hx

Economy of Metal Usage

didi dodo DiDi Geometrical Modifications for Better Economy

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.

Two inner tubes and one outer tube

Differential Element Analysis dz

Heat lost by hot fluid: