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Frequently Asked Questions
What does the water actually buy?
A lower achievable temperature.
Dry equipment can only approach the dry bulb.
Wetting the air allows approach to the wet bulb.
In hot dry climates that gap is very large.
It converts free cooling from supplement to strategy.
In humid climates the gain is much smaller.
How much water does it consume?
Enough to be a running cost and a permitting question.
Establish the annual figure before selection.
It scales with hot hours, not with capacity alone.
Water-stressed regions increasingly ask for it.
Some operators report water alongside energy.
Adiabatic designs wet only when needed.
What hygiene duty comes with it?
Wetted warm surfaces carry a real risk.
Treatment, monitoring and cleaning are required.
Records are usually part of the obligation.
Requirements differ between jurisdictions.
Establish them before choosing equipment.
It is the most underestimated line in the budget.
Does water quality affect performance?
Considerably, and steadily.
Hard water scales the wetted media.
Scaled media reduces the achievable approach.
Performance falls without any fault appearing.
Pre-treatment costs less than media replacement.
Test the makeup supply rather than assuming.
What happens if the water supply fails?
The unit reverts to dry operation.
Capacity falls to the dry cooler case.
That may be below design on a hot day.
Mechanical backup covers the gap.
Storage buys time on a short interruption.
Size the fallback for the worst ambient.
Which climates suit it best?
Hot and dry, by a wide margin.
The wet bulb depression is largest there.
Humid climates offer far less benefit.
Cool climates may not need it at all.
Assess against local hourly data.
An annual average hides the useful detail.
What maintenance does it need?
More than dry equipment, on a schedule.
Media condition and water distribution.
Basin cleaning and treatment dosing.
Drift eliminators and strainers.
Winterisation where freezing occurs.
Budget the labour, not only the parts.