Airborne biochemical attacks and building environment security (5): efficiency factor—human-oriented indices for evaluating ventilation efficiency

For rationally evaluating the ventilation efficiency in emergencies, describes the efficiency factor with human-oriented view. Proposes the two sets of indices, efficiency factor of contaminant source (EFCS) and efficiency factor of supply air (EFSA), and each set includes three indices. EFCS and EFSA indices are meant for scaling the influence of contaminant source and supply air on indoor occupants respectively in any given period of time. In addition, numerically analyses a three-dimensional room object to demonstrate the characteristics and applications of the indices. The results show that the indices proposed could be used in implementing the scaling, and thus to be a guide for establishment of ventilation and evacuation strategy in emergencies.