What a purge sector is
A rotary energy wheel spins exhaust and supply airstreams through the same matrix, so a small amount of exhaust gas and moisture is inevitably carried into the supply. A purge sector is a slice of the wheel (typically 5-15 degrees) where a portion of the clean supply air is directed backwards through the matrix to flush out residual exhaust before that section re-enters the supply duct.
What it reduces
- Gas carryover: a few percent of exhaust volume can migrate to supply; purge cuts it.
- Moisture carryover: important in humid climates where enthalpy recovery is used.
- Particulate carryover: helps in mildly dirty exhaust.
Limits of purge
Purge lowers but does not eliminate carryover, and it costs a little recovered energy. For genuinely contaminated streams – labs, hospitals – isolation beats purge, so a separated plate or heat pipe is preferred over a wheel.
Frequently asked questions
Does purge waste energy? A small amount, but it protects supply air quality, which is usually worth more.
Is purge the same as bypass? No – bypass diverts flow around the wheel for free cooling; purge cleans the matrix in place.
Need help specifying the right air-to-air heat recovery for your project? Contact the QIYU engineering team – WhatsApp +86 157 5335 5505, or email kuns913@gmail.com.
Questions fréquemment posées
What is the purge sector on a rotary wheel?
A portion of the wheel, often 5 to 15 percent, is purged with supply air to sweep residual exhaust out of the matrix before it re-enters the supply stream, reducing carryover.
Does purge eliminate cross-contamination?
It greatly reduces it but cannot eliminate it entirely; for truly separated streams, such as dirty or contaminated exhaust, a plate or run-around coil is safer.
Questions fréquemment posées
What is the purge sector on a rotary wheel?
A portion of the wheel, often 5 to 15 percent, is purged with supply air to sweep residual exhaust out of the matrix before it re-enters the supply stream, reducing carryover.
Does purge eliminate cross-contamination?
It greatly reduces it but cannot eliminate it entirely; for truly separated streams, such as dirty or contaminated exhaust, a plate or run-around coil is safer.
Spécifiez le bon échangeur
Nos ingénieurs dimensionnent le noyau selon votre débit, température et budget de perte de charge, et choisissent la récupération par plaque, rotative ou caloduc selon l'application. Lisez le guide de l'échangeur , ou contactez-nous pour une spécification.
Produits connexes
Récupération par plaque, rotative ou caloduc pour le CVC et la ventilation.
Noyaux stationnaires à grande surface pour l'air et le liquide.
Récupération d'énergie à haute efficacité pour grands débits.
Courants passifs et totalement séparés pour applications propres.