Miscellaneous Mechanical Components
The nomenclature for induced draft cooling towers, including some items not illustrated in
Figure 11 is summarized below.
The casing encloses the walls of the cooling tower, exclusive of
fan deck and louvers.
Collecting basin -
The collecting basin is a receptacle beneath the cooling tower
for collecting the water cooled by the cooling tower. It can be
made of concrete, wood, metal, or an alternative material.
Certain necessary accessories are required such as sump,
strainers, overflow, drain, and a makeup system.
Drift eliminators -
The drift eliminators are parallel blades of PVC, wood, metal,
or an alternative material arranged on the air discharge side of
the fill to remove entrained water droplets from the leaving air
The driver is a device that supplies power to turn the fan. It is
usually an electric motor, but turbines and internal combustion
engines are occasionally used.
Drive shaft -
The drive shaft is a device, including couplings, which
transmits power from the driver to the speed reducer.
The fan is a device used to induce air flow through the cooling
Fan deck -
The fan deck is a horizontal surface enclosing the top of the
cooling tower above the plenum that serves as a working
platform for inspection and maintenance.
Fan stack -
The fan stack is a cylinder enclosing the fan, usually with an
eased inlet and an expanding discharge for increased fan
The fill is PVC, wood, metal, or an alternative material that
provides extended water surface exposure for evaporative heat
Intake louvers -
The intake louvers are an arrangement of horizontal blades at
the air inlets that prevent escape of falling water while allowing
the entry of air.