In this video we look at natural draft, forced draft, induced draft and balanced draft. Some of the models are animated.

Explanations are given for each type of draft and working examples are used to aid understanding.

Natural draft tower components include the fill, spray nozzles, reservoir and hyperboloid tower. This cooling tower works on the principle of natural convection, or, the stack effect.

Forced draft fans are usually of the axial or centrifugal type. Forced draft means that the air is pushed over the heat exchanger i.e. the air passes through the fan first then over the heat exchanger.

Induced draft fans are also usually of the axial or centrifugal type. Air passes over the heat exchanger first then through the fan.

Note that it is possible to install fans before or after a heat exchanger in natural draft cooling towers. If this is done, the tower is no longer a natural draft tower, it is a forced or induced draft hyperboloid tower. The efficiency of the tower reduces as it now requires electricity to operate.

Suction firing and primary air fans are also briefly mentioned.

All 3D models used in the video are available at www.saVRee.com.

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Thanks for watching!

Jon