Abstract
In evaluating the performance of evacuation safety at a building fire, the evacuation time is generally compared with the smoke filling time, or the smoke temperature and gas concentrations are compared with reference value. The smoke filling time, etc. are often predicted using BRI2002 or simple equations. However, these simple equations are solved under the condition of no smoke exhaust system, so the effect of smoke exhaust system cannot be evaluated. Hence, in this study, we have proposed improved simple equations for predicting the smoke layer height that can appropriately take into consideration the effect of the smoke exhaust system. And applying these equations to several sample spaces and comparing them with a computer model, we have verified their predicting capabilities. As a result, we see these simple equations calculate safer side value than BRI2002, a two-layer zone model, often used as a tool in evacuation safety design.
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