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Frequently Asked Questions
How does this differ from a remote condenser?
By what is inside the coil.
A dry cooler carries water or glycol.
A remote condenser carries refrigerant.
They look nearly identical installed.
Sizing terms and pipework are not comparable.
Ordering one for the other is a common error.
What is the approach, and why does it matter most?
How close the leaving fluid gets to ambient air.
A tighter approach needs more coil and more fan.
It decides how many hours free cooling is available.
That is where the annual energy is won.
A loose approach closes those hours permanently.
Design-day capacity does not reveal it.
Does it use any water?
None at all.
Heat goes straight to air across the coil.
There is no treatment regime to run.
No makeup supply is needed.
That suits sites where water is scarce or costly.
The trade is a higher achievable temperature.
What does glycol cost in performance?
Heat transfer falls and pumping power rises.
Both scale with concentration.
Use the lowest concentration the climate requires.
Over-dosing is common and quietly expensive.
It must be in the sizing, not added later.
Inhibited fluids also need periodic testing.
Why does air recirculation matter so much?
Discharge air is warmer than ambient.
If it reaches the inlet, capacity falls.
Nothing alarms and no fault appears.
Walls, screens and close spacing all cause it.
Check clearances against the manufacturer's figures.
Acoustic screening is a frequent culprit.
What maintenance does it need?
Coil cleanliness and fan condition.
Fouled fins raise the approach steadily.
Airborne dust and seeds are the usual cause.
Fan bearings and EC motors are the wearing parts.
Fluid quality is tested on its own schedule.
Clean coils recover performance cheaply.
How is redundancy usually handled?
By multiple units rather than one large one.
Loss of a single unit then costs part of capacity.
Fan arrays give redundancy within a unit too.
Pipework must allow one unit to be isolated.
Valving for that is easy to omit at design.
Agree the failure case before selecting.