Resilient Demand Control Ventilation system for dwellings

Demand Control Ventilation strategy resilience is analysed through the envelope leakage distribution. Global building envelope leakage has great impact on energy consumption and targeted tightness values are systematically decreased in the several thermal regulations around the world. This leads to a more controlled ventilation system, but also to a more sensitive system to the leakage distribution. Considering fixed test cases with known entry data, two types of relative humidity based DCV strategy are analysed through their response to randomized envelope leakage distribution. A set of one hundred simulations is realized. Results shows that impact on energy is almost negligible while it is major on internal air quality. More than 50% of the simulations would have led to reject such DCV strategy while it passes all the threshold values for an evenly distributed envelope leakage. A double sensor based DCV strategy is presented in order to avoid the leakage sensitivity. Both experimental and numerical analyses are presented. Two extra indicators are then proposed to be considered in performance based approaches for multiple sensor based DCV strategy, in order to avoid undesired effects as the one observed for single sensor based DCV.