CLASSIFICATION OF HEAT EXCHANGERS
Heat exchangers may be classified according to the following main criteria:
•Recuperators
•Regenerators
•Direct Contact apparatus
RECUPERATORS
• The conventional heat exchangers with heat transfer between two fluids.
• Hot steam A recovers some of the heat from stream B.
REGENERATORS
•Storage type heat exchangers. The same flow passage (matrix) is alternately occupied by one of the two fluids.
•Thermal energy is not transferred through the wall.
Direct contact type heat exchangers:
- Heat transfer between the cold and hot fluids through a direct contact between these fluids.
- Examples: Spray and tray condensers, cooling towers
Different heat transfer applications require different types of hardware and different configurations of heat transfer equipment Heat exchangers come in many different types:
1.Double pipe
2.Spiral
3.Finned
4.plate type 5.Shell and tube (most common in chemical process industries)