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Figure 12   Natural Convection Cooling Tower
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Mechanical Science Volume 2 of 2
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Miscellaneous Mechanical Components DOE-HDBK-1018/2-93 COOLING TOWERS Summary The important information in this chapter is summarized below. Cooling Towers  Summary The cooling tower removes heat from water used in cooling systems within the plant.   The heat is released to  the air rather than to a lake or  stream. This  allows  facilities  to locate  in  areas  with less  water  available  because the cooled water can be recycled.  It also aids environmental efforts by not contributing to thermal pollution. Induced  draft  cooling  towers  use  fans  to  create  a  draft  that  pulls  air through   the   cooling   tower   fill. Because   the   water   to   be   cooled   is distributed such that it cascades over the baffles, the air blows through the water, cooling it. Forced draft cooling towers blow air in at the bottom of the tower.   The air  exits  at  the  top  of  the  tower.    Water  distribution  and  recirculation difficulties limit their use. Natural convection cooling towers function on the basic principle that hot air rises.   As the air inside the tower is heated, it rises through the tower. This  process  draws  more  air  in,  creating  a  natural  air  flow  to  provide cooling of the water. Rev. 0 ME-05 Page 23







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