In large buildings, pollutants may be emitted locally and discontinuously what can result in time dependent heterogeneous pollutant concentration fields. Efficient ventilation solutions should provide the right amount of fresh air at the right place so as to minimise energy cost and discomfort. In this paper, a new ventilation strategy is developed. It is divided in several phases. First, pollution sources are identified with a minimisation technique and then the time dependent pollutant concentration is predicted. For this, a zonal model describing the airflow pattern and a pollutant dispersion is used. Second, a minimum ventilation rate to limit the local pollution concentration is calculated considering different inlet positions. This allows us to determine an optimal compromise between air quality and energy cost by choosing the inlet location associated with the lowest total ventilation rate. A theoretical case study using the developed controller is presented in the paper. The satisfactory results on this simple case allow us to consider further application in the future.
Proposal for an optimum ventilation of large enclosures.
Hong Kong, City University, Division of Building Science and Technology, 2001, proceedings of IAQVEC 2001, "Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Fourth International Conference", held Changsha, Hunan, China, 2-5 October, 2