Local ventilation effectiveness parameters in air distribution system design.

The ventilation effectiveness concept has been extensively used in research, where it has long been recognised as a good indicator of air quality. Also, there are many examples of its parameters having been measured as an aid to monitoring the air quality in completed buildings, usually to solve an air quality problem. However, despite their value as a predictor of the air quality to be achieved by an air distribution system, ventilation effectiveness parameters are rarely used in design. This paper shows that ventilation effectiveness parameters can easily be included in the design calculations, both early in simple modelling, and at a detailed advanced stage by association with a CFD model. The interpretation of the parameters is also explained.