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Frequently Asked Questions
What does transferring moisture add?
Far more total energy moved.
Sensible heat alone is only part of the load.
Latent load dominates in humid climates.
Pre-drying incoming air cuts cooling work.
In winter it returns moisture that would be lost.
Indoor humidity holds up as a result.
Why do wheels dominate large installations?
Transfer surface per unit of volume.
A rotating matrix packs far more in than plates.
Efficiency per unit of space is high.
Plant room area is usually constrained.
That decides many large schemes.
Plate devices need more room for less.
What is carryover and why does it matter?
Exhaust air carried round into the supply.
A rotating matrix does this unavoidably.
Purge sections reduce it considerably.
Good design keeps it low.
It is never zero.
Some applications cannot accept any.
When is a wheel the wrong choice?
Where exhaust must not reach supply at all.
Laboratory and clinical extract qualify.
Contaminated industrial exhaust does too.
A plate or membrane device is required there.
Carryover is structural, not adjustable to zero.
Decide from the exhaust, not the efficiency.
What wears on a wheel?
Drive belt, motor, bearings and seals.
Belts stretch and eventually break.
Perimeter seals harden and leak.
Bearings carry a rotating mass continuously.
A stopped wheel is invisible from inside.
Rotation sensing is worth fitting.
Can transfer be controlled?
Yes, by varying wheel speed.
Slowing the wheel reduces transfer.
Stopping it removes recovery entirely.
That matters when recovery would add to the load.
Bypass dampers achieve the same result.
Confirm the unit offers one or the other.
Is frost a problem?
Less than on plate devices.
Moisture transfer moderates the cold face condition.
Severe climates can still need a strategy.
Speed reduction is the usual approach.
Preheat is the alternative.
Confirm behaviour at the design minimum.