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Frequently Asked Questions
How does an open-circuit tower reject heat?
By evaporating a fraction of the water.
Water is distributed over the fill.
Air is drawn or blown through it.
Evaporation takes energy from the remaining water.
The condenser water leaves cooler than it arrived.
Why can it cool below air temperature?
Because evaporation, not contact, does the work.
The limit is the wet-bulb temperature.
Wet-bulb sits below the dry air temperature.
The gap is widest in hot dry weather.
No air-cooled equipment can reach that.
What separates counterflow from crossflow?
The direction air takes through the water.
Counterflow sends it upward against the fall.
Crossflow sends it horizontally through it.
Machine shape and pumping head both change.
So does access to the distribution system.
What separates induced from forced draught?
Where the fan sits in the airstream.
Induced draught pulls air at the discharge.
Forced draught pushes it at the inlet.
Fan position affects noise and recirculation.
It also affects where the motor lives.
Why does dissolved content concentrate?
Because only pure water evaporates.
Everything dissolved stays behind.
Make-up water brings more in with it.
Concentration therefore rises continuously.
Left alone it leads to scale and corrosion.
What holds that concentration in check?
Bleeding off a proportion of the water.
Fresh make-up replaces what is removed.
The rate is set against the evaporation rate.
Chemical treatment supports it.
Regular testing confirms it is working.
What else does open water require?
Biological control, monitored and recorded.
Warm open water is a known risk if neglected.
Cleaning and inspection are scheduled, not occasional.
Drift is minimised by the eliminators fitted.
These duties last as long as the tower runs.