PPT ON COOLING TOWER

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COOLING TOWER  Presentation Transcript

1.COOLING TOWER

2.1-Introduction
2-Types of cooling towers
3-Assessment of cooling towers

3.Introduction to cooling tower
Cooling tower is the heat rejection device, which extracts heat waste to atmosphere through the cooling of water stream to a lower temperature

4.Main Features of Cooling Towers

5. Components of a cooling tower
Frame and casing: support exterior enclosures
Fill: facilitate heat transfer by maximizing water / air contact
Splash fill
Film fill
Cold water basin: receives water at bottom of tower

6.Drift eliminators: capture droplets in air stream
Air inlet: entry point of air
Louvers: equalize air flow into the fill and retain water within tower
Nozzles: spray water to wet the fill
Fans: deliver air flow in the tower

7.Types of Cooling Towers
Mechanical Draft Counterflow Tower
Mechanical Draft Crossflow Tower

8.Mechanical Draft Cooling Towers
Three types
Forced draft
Induced draft cross flow
Induced draft counter flow

9.Forced Draft Cooling Towers
Air blown through tower by centrifugal fan at air inlet

10.Advantages: suited for high air resistance & fans are relatively quiet
Disadvantages: recirculation due to high air-entry and low air-exit velocities

11.Induced Draft Cooling Towers
Two types
 Cross flow
 Counter flow
Advantage: less recirculation than forced draft towers
Disadvantage: fans and motor drive mechanism require weather-proofinh

12.Induced Draft Counter Flow CT
Hot water enters at the top
Air enters at bottom and exits at top
Uses forced and induced draft fans
13.Induced Draft Cross Flow CT
Water enters top and passes over fill
Air enters on one side or opposite sides
Induced draft fan draws air across fill