S.T.B.S College of Diploma Engineering, SURAT

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Presentation transcript:

S.T.B.S College of Diploma Engineering, SURAT Class: Mech-1052(c) Prepared.BY:Ansari Kaushar Ali N. EN.NO:106470319130 TOPIC : Types of cooling tower

Contains Introduction Types of cooling towers

Introduction Main Features of Cooling Towers

Introduction 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

Introduction Components of a cooling tower 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

Types of cooling towers

Types of cooling towers Natural Draft Cooling Towers Hot air moves through tower Fresh cool air is drawn into the tower from bottom No fan required Concrete tower <200 m Used for large heat duties

Types of cooling towers Natural Draft Cooling Towers

Types of cooling towers Mechanical Draft Cooling Towers Large fans to force air through circulated water Water falls over fill surfaces: maximum heat transfer Cooling rates depend on many parameters Large range of capacities Can be grouped, e.g. 8-cell tower

Types of cooling towers Mechanical Draft Cooling Towers Three types Forced draft Induced draft cross flow Induced draft counter flow

Types of cooling towers Forced Draft Cooling Towers Air blown through tower by centrifugal fan at air inlet Advantages: suited for high air resistance & fans are relatively quiet Disadvantages: recirculation due to high air-entry and low air-exit velocities

Types of cooling towers Forced Draft Cooling Towers

Types of cooling towers 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

Types of cooling towers 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

Types of cooling towers 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

Types of cooling towers Induced Draft Cooling Towers

Cooling Towers THANK YOU FOR YOUR ATTENTION