Impact of residential natural ventilation and air-tightness techniques on the energy loss and indoor air quality

To better quantify the impact of different window opening models in comparison to ventilation techniques a multizone ventilation model, incorporating the CO2-production of the inhabitants, was developed, using Comis-Transys. The reference model represents a free-standing dwelling in which infiltration is the only source of fresh air. Through a series of simulations natural ventilation systems (standard, user controlled or CO2-based demandcontrolled), air-tightness techniques and/or window opening models (deterministic or stochastic) are added. The effect of the window opening models on the energy loss, air change rate and the indoor air quality is quantified and compared to the effect of different ventilation and air-tightness techniques.