Double pipe heat exchanger

1. Double pipe heat exchanger 1 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 2 Heat transfer mechanism Degree of surface compactness Heat transfer type Flow arrangement Number of passes Construction

3. Classification 3 Direct contact type : Cooling towers, Spray towers Indirect contact type Cooling tower Spray tower

4. Classification 4 Single Pass arrangement Multiple pass arrangement

5. Classification 5 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 6

7. Classification 7 The heat exchangers classify based on geometry of construction are, Plate Heat Exchangers Extended surface Heat Exchangers Tubular Heat Exchangers

8. Classification 8 Plate Heat Exchanger Limited to below 25 bar and 250 C 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. Classification 9 Plate type heat exchanger

10. Classification 10 Spiral heat exchanger

11. Classification 11

12. Classification 12 Plate Heat Exchanger A advantages 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 i ndustry .

13. Classification 13 Plate Heat Exchanger D isadvantages 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 14 Extended surface heat exchangers Plate fin heat exchanger Tube fin heat exchanger Tube fin exchanger Plate fin exchanger

15. Classification 15

16. Classification 16

17. Classification 17 Tubular heat exchanger Material and design development Widely used No limit to range of temperatures and pressures Two types Double pipe heat exchanger Shell and tube heat exchanger

18. Classification 18 Double pipe heat exchanger They consist of one pipe concentrically located inside a second larger pipe. Double pipe exchanger

19. Classification 19 Phase change heat exchangers Condensers(water cooled, air cooled) Reboilers Evaporators Air cooled condenser Forced draft Induced draft

20. Classification 20 Phase change heat exchangers Water cooled condenser

21. Classification 21 Area density: Ratio of heat transfer area to the volume of heat exchanger Compact Heat exchanger A rea density greater than 700 m 2 /m 3 or 213 ft 2 /ft 3 or hydraulic diameter ≤ ¼ inch for gas stream. Area density greater than 400 m 2 /m 3 or 122 ft 2 /ft 3 for liquid stream). Non-compact Heat exchanger A rea density less than 700 m 2 /m 3 for gas stream. Area density less than 400 m 2 /m 3 for liquid stream.

22. Classification 22

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