Airflow driven contaminants. Transport through buildings. Annex 20 Subtask 2.5.

Air is the main transport medium for contaminants in buildings. Minimizing source strengths has first priority, second is to control air flow rates, supply and exhaust, and directions between zones in buildings. Computer simulation models forventilation and pollutant spread in buildings have been proven to give useful predictions. Large measurement campaigns for optimizing ventilation and pollutant problems are complex and expensive. They are often jammed by too many vague parameters influencing the result. The computer models are an alternative and form a supplement to measurements. New ventilation systems or control strategies can be tested to some extent with the models. Measurements for checks and determination of source and sink coefficients for different materials are needed to tune the simulation models.