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Frequently Asked Questions
How does it cool without refrigeration?
Water evaporates into the air.
The energy for that comes from the air itself.
Air leaves the media cooler than it entered.
No refrigerant or compressor is involved.
Fan power and water are the running cost.
For large air volumes that is compelling.
What is the absolute constraint?
Humidity, and it cannot be designed around.
Cooling comes from adding moisture.
Dry incoming air gives the most cooling.
Humid incoming air gives very little.
The added moisture then makes things worse.
Climate decides feasibility outright.
Which data should be assessed?
Wet bulb, not dry bulb temperature.
Temperature alone will mislead completely.
Wet bulb shows the cooling actually available.
Local hourly data gives the real picture.
Design-day figures hide the seasonal shape.
Assess before selecting anything.
When is it wrong regardless of climate?
When the space is already humid.
Laundries and wet processes qualify.
Pool halls certainly do.
Adding moisture to their make-up air worsens it.
Those spaces usually need drying, not cooling.
Check the space, not just the weather.
What does the water bring with it?
A supply, treatment and a cleaning regime.
The supply must exist all year.
Wetted warm surfaces carry a hygiene duty.
Monitoring and records are usually required.
Requirements differ by jurisdiction.
Establish them before selection.
Does water quality affect it?
Considerably, and steadily.
Hard water scales the media.
Scaled media cools less and less.
Performance falls with no fault appearing.
Pre-treatment costs less than replacement media.
Test the supply rather than assuming.
What happens in winter?
It runs as a dry make-up air unit.
The media section is bypassed or drained.
Draining prevents freezing damage.
Heating, if required, is a separate section.
Winterisation should be a documented procedure.
It is easy to forget in a mild autumn.