Posted in Ventilation
According to several recommendations and scientific studies the perceived air quality improves with increasing outdoor air supply rate. And there seems to be an upward trend in the recommandations: A few months ago, I saw 25 l/s/person mentioned as the lower limit for outdoor air supply to avoid Sick Building Syndrom.
On the other hand many buildings with natural ventilation have a very low supply of outdoor air during winter time - some times probably less than 0,1 air changes per hour (excl. infiltration). And in a number of these buildings the users seem to have a positive perception of the indoor air quality. Is there a psychological factor involved?
Obviously it is very important for the energy consumption in the ventilation system that you limit the outdoor air flow flow rate during the cold season. But - as indicated above - it is not easy to assess the right figure.
What is your opinion/experience?