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Frequently Asked Questions
What actually separates these four?
Three questions do most of it.
Does it contain a compressor of its own.
Does it consume water to reach its temperature.
Does it cool a fluid or condense refrigerant.
Answering those narrows the list quickly.
Capacity comes after, not before.
Why does the climate come before the product?
It decides how many hours free cooling is available.
That is where the annual saving lives.
A long cold season justifies idle-in-summer equipment.
A hot humid site may rule out dry rejection entirely.
Design-day capacity says nothing about annual energy.
Get the local hours before comparing units.
What does buying water actually buy?
A lower achievable temperature.
Evaporative equipment works against the wet bulb.
Dry equipment can only approach the dry bulb.
That difference is large in hot dry climates.
It costs consumption, treatment and a makeup supply.
The supply has to be reliable all year.
Can free cooling carry the whole load?
Rarely for the full year.
Most sites run partial free cooling for many hours.
Full free cooling needs genuinely cold ambient.
Partial hours still cut compressor energy sharply.
Ask for hours at full and partial separately.
A single annual percentage hides the shape.
How does this equipment size against IT load?
Reject more than the IT draws.
Pumps, fans and losses all add heat.
Future rack density should be allowed for.
Liquid cooled halls change the temperatures involved.
Warmer return water widens free cooling hours.
Design the loop temperatures deliberately, not by default.
What limits where it can go?
Weight, airflow and sound.
Roof structure has to carry the plant.
Discharge air must not recirculate into inlets.
Boundary sound limits often decide fan selection.
Service access is needed on every side.
Settle these at layout, not at commissioning.
What has to be agreed before ordering?
Ambient conditions the capacity is quoted at.
Fluid type and concentration, where a fluid is used.
Water quality and availability, where water is used.
Sound levels at the boundary.
Redundancy expected on loss of one unit.
Spares availability in the operating region.