Demand controlled ventilation: a case study.

Good indoor air quality in buildings becomes such a major concern that new design recommendations emerge in many countries (USA, Nordic Countries,...). Improvement of the interior environment should not beat the expense of higher energy consumption. Heat recovery systems are one appropriate answer to this challenge. However, additional energy savings could be achieved by applying demand controlled ventilation when the internal loads vary significantly. A CO2 controlled ventilation system has been installed in a conference room with high variable occupancy in mid 91. In this paper, we present the survey of 6 months of use, the limits and the benefits of such a system. We focus on the practical aspects to offer the optimum air quality and to integrate the occupants and building owner's requirements.