UFC 3-240-13FN
25 May 2005
Figure 4-5. Hyperbolic Natural-Draft Cooling Towers
4-1.3.2
Forced-Draft Towers. The term "forced draft" denotes that air is forced or
blown by fans into the cooling tower and up through the flow of falling water in the
cooling tower. Drift eliminators are installed to prevent water entrained in the air from
leaving the system.
4-1.3.3
Induced-Draft Towers. The term "induced draft" denotes that air is drawn
by fans through the flow of falling water and up and out of the cooling tower. The airflow
can be drawn either cross-flow or counter-flow with respect to the orientation of the
falling water, resulting in either a cross-flow tower or a counter-flow tower. Drift
eliminators are also present. (See Figures 4-6, 4-7, 4-8, and 4-9 for diagrams and
photos of cross-flow and counter-flow cooling towers.)
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