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Natural Draft Cooling Towers
Initially, it was necessary that natural draft towers be built to great height and placed at right angles to the prevailing wind to provide sufficient cooling. The packed atmospheric tower represents an
improvement in this design because water is sprayed downward over fill or
packing, which increases cooling efficiency by further breaking up water flow
and exposing more wetted surface. Again, open louvers let outside air pass through the tower over full height. In both the atmospheric spray-filled and packed atmospheric towers, relatively high water losses occur, as water droplets are lost through the louvers. This water loss is called windage, and the water losses total between 0.3% and 1.0% of the recirculation rate of the system. |
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As
the name implies, natural draft systems rely on natural air currents for
air flow across the t
