Prediction of indoor air quality in houses with concentration control- ventilation systems considering the concealed air leaks and dwellers opening behaviour

In order to find an effective method to keep indoor air quality good through the year in real houses, a simulation program: Fresh was reformed to integrate several important factors in Japanese detached houses and named “Fresh2010”. The factors are infiltration from the concealed spaces, behaviour of window openings, the kind of ventilation systems and a concentration control systems. The present dwellers’ habits of opening windows may be one of the factors in causing indoor air pollution. The concentration control ventilation with proper design may keep indoor air quality good through a year.