SA-96-01-4 -- Room Air and Contaminant Distribution in Mixing Ventilation

Presents the results of a series of laboratory measurements of room air and contaminant distribution in a full-scale test room with mixing ventilation. Investigates how air change rate, supply air temperature, contaminant source location and contaminant density would influence the distribution of room air and contaminants and to what extent complete mixing was achievable. Notes the results are also useful for validation of computational fluid dynamics calculations of both room air and contaminant distribution. Investigates the distribution of supply air for heating, isothermal and cooling conditions at different air change rates. Among the conclusions states that the airflow pattern was strongly dependent on the Reynolds number at low air change rates, that complete mixing was difficult to achieve and that unfavourable conditions might result in quite large gradients in the distribution of contaminants and large defences in the local mean age of air as well.

Keywords: year 1996, Measuring, laboratory testing, contaminants, ventilation, mixing