Determining ventilation strategy to defend indoor environment against contamination by integrated accessibility of contaminant source (IACS)

With the recent occurrence of global terrorism, people are paying more and more attentions to ventilation strategy decision-making to avoid or reduce the influence of suddenly released contaminant when emergency occurs. This paper proposes a new uniform parameter, integrated accessibility of contaminant source (IACS), which combines the newly presented concept, accessibility of contaminant source (ACS) and occupied density (OD), to direct ventilation strategy to defend indoor environment against contamination. A 3-D full-scale room with displacement and mixing ventilation system is numerically studied by assuming contaminant released at certain positions in the room. By adopting IACS as the index in which the occupant distribution indoors is considered to evaluate the total influence of contaminant in a finite period of time, how to determine the ventilation strategy is discussed. It is shown that the new index can be applied to determine ventilation strategy for the purpose of defending indoor environment against contamination.