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Frequently Asked Questions
What does using air instead of water remove?
An entire supporting system.
No cooling tower and no makeup water.
No treatment chemistry or hygiene duty.
No discharge consent to hold.
Far fewer components that can fail.
That is often worth more than the efficiency lost.
What sets the lowest achievable fluid temperature?
Ambient air, plus a margin.
The fluid cannot go below the air it rejects to.
A practical margin sits above that.
Summer design temperature is the governing case.
Duties needing colder fluid require another method.
Check the requirement against local design conditions.
How is fin material chosen?
By the atmosphere, not by the process.
Aluminium on copper is the general case.
Coastal air attacks it and needs protection.
Coated or all-aluminium constructions are used.
Industrial atmospheres bring their own chemistry.
State the site environment when enquiring.
Why is fin spacing a trade rather than a specification?
Closer fins give more surface in less space.
They also clog considerably faster.
A dusty environment wants open spacing.
A clean plant room can use tight spacing.
The wrong choice fouls within a season.
Describe the environment before accepting a selection.
What does fouling actually do?
Raises process temperature steadily and silently.
No alarm and no fault appears.
Seeds, dust and insects act faster than expected.
Performance is recovered by cleaning, cheaply.
Access to both coil faces is essential.
That access cannot be added after installation.
How much does fan power matter?
It runs continuously, so considerably.
More coil means less fan for the same duty.
Cheap units buy fan power instead of surface.
Speed control saves at part load.
Noise follows fan power closely.
Compare annual energy, not purchase price.
What information does a supplier need?
Both fluid temperatures and the flow rate.
The process fluid and its material compatibility.
Local summer design air temperature.
Site atmosphere and expected airborne debris.
Available space and any sound limits.
A duty alone will produce the wrong bundle.