1. Heat Exchnagers

2. Heat Exchangers
A heat exchanger is used to exchange heat between two fluids of different temperatures, which are separated by a solid wall.
Heat exchangers are used to carry out energy conversion and utilization. They utlize a wide range of flow configurations.
Applications in heating and air conditioning, power production, waste heat recovery, chemical processing, food processing, sterilization in bio-processes.
Heat exchangers are classified according to flow arrangement and type of construction.

3. Plan of the study Classification of HEX
Determination of the overall heat transfer coefficient (U)
Log Mean Temperature Difference (LMTD)
The correction factor
The effectiveness-NTU method
Design aspects and selection of HEX

4. Types of Heat Exchangers
1. Double pipe Heat exchanger

5. Types of flow in double pipe HEX

6. 2. Compact Heat exchangers Designed to realize large heat transfer area per unit volume (area density) HEX with area density >700 m2/m3 is called compact. Examples of compact HEX are: car radiators and Human lungs.

7. Compact HEX

9. 3. Shell and tube HEX The most commonly used type of HEXs in industrial applications. It contains large number of tubes enclosed inside a shell. One fluid flows inside the tubes while the other is flowing outside the tubes (inside the shell)

10. Shell-and-tube HEX

11. Multipass flow arrangement in Shell and tube HEX

13. 4. Plate and Frame HEX It consists of a series of plates with corrugated flat flow passages. The hot and cold fluids flow in alternate passages. suitable for fluids at the same pressure.

15. Regenerative HEX-static type

16. Regenerative HEX-dynamic type

19. The overall heat transfer coefficient is dominated by the smaller convection coefficient