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Explanation: Lorsque le taux de brassage le nécessite, une extraction complémentaire de type VAC, pilotée par le LAC, sera ajoutée sur le réseau de manière à gérer [...]
irian-technologies.com
When the air change rate requires it, a VAC, complementary exhaust regulator, controlled by the LAC, is added to the network in order to very finely tune the make-up air.
irian-technologies.com
this may be apocryphal, but when smoking was banned on aircraft, the rate at which infectious airborne diseases was transmitted to other passengers shot up. This was widely attributed to a greatly reduced number of changes of stale air with fresh. It's certainly true (anecdotally, at least) that a good way to catch a cold or flu is to take a long haul flight to the other side of the world.
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Answers
11 mins confidence: peer agreement (net): +1
air change rate
Explanation: Lorsque le taux de brassage le nécessite, une extraction complémentaire de type VAC, pilotée par le LAC, sera ajoutée sur le réseau de manière à gérer [...]
irian-technologies.com
When the air change rate requires it, a VAC, complementary exhaust regulator, controlled by the LAC, is added to the network in order to very finely tune the make-up air.
irian-technologies.com
kashew France Local time: 20:50 Specializes in field Native speaker of: English PRO pts in category: 94
Grading comment
Thanks, following further research I have concluded with this term.
Explanation: Try researching something like that; I did a huge project on this stuff years ago, and I've a vague recollection it was something along those lines — it refers to the proportion of fresh air that is mixed in with the recirc. air in a mechanical ventilation system (just like in your car!)
It would be as well to confirm with the actual context (in particular, what units, if any, are this 'taux de brassage' expressed in), but it seems as if Kashew's answer is the correct one, and mine refers to soemthing different.
Pour optimiser l’homogénéité de l’air, et donc le confort, il faut viser un certain niveau de taux de brassage. Le taux de brassage correspond au rapport entre le débit total d’air brassé et le volume du
bâtiment.
Le taux de brassage pour l'air chaud est le rapport entre le débit d'air brassé et le volume du bâtiment. Il est déterminé en fonction de la géométrie du bâtiment et du matériel de chauffage choisi.
Il varie en moyenne de 2 volumes/heure( aérothermes modulants) à 5 volumes/heure (chauffage d'église).
Le respect d'un bon taux de brassage conditionne une bonne homogénéité de la température d'air du volume à chauffer ; et plus le taux de brassage est important, plus la montée en température du local sera rapide.
Le taux de brassage est prioritaire sur le calcul des déperdition pour conditionner l'atteinte de la température de consigne.
Tony M France Local time: 20:50 Works in field Native speaker of: English PRO pts in category: 453
Notes to answerer
Asker: Thanks Tony for your help, I did some extra research and find a lot more references for this context, i.e. room ventilation particularly for sealed environments and passive houses, for "air change rate", so I will go for that. I see a lot of references for "mixing rate" for things like "fuel/air mixing rate", i.e. where the air is actually mixed with something else. Thanks again for your help though!
Asker: Yes the unit used is Vol/h. Nice working with you on this one!
The translation workplace 
