排烟启动时间对烟气控制的影响

Influence of smoke exhaust start-up time on smoke control

建筑火灾排烟系统设计中,有关排烟启动时间至今仍没形成统一的设计方法或分析方法,目前主要依靠专家经验或者依据排烟系统产品的性能进行取值和校验,存在很大主观性。该文通过综合考虑建筑火灾发展各阶段的经验模型,给出了计算烟气层高度的递推求解式,在此基础上利用灵敏度分析方法揭示了排烟启动时间对烟气控制效果的影响,提出了启动时间取值的最优区间、风险区间和失效界点。该研究有助于提高火灾排烟系统的设计合理性和安全性。

Fire smoke exhaust systems in buildings need accurate designs of the smoke exhaust start-up time.The start-up time is mainly determined by expert experience or the performance of constant exhaust systems,which are very subjective.This paper describes a recursive solution method to calculate the smoke layer height that integrates empirical models. A sensitivity analysis method is then used to study the influence of the smoke exhaust start-up time on the smoke control.Methods are given to calculate the best start-up time,the risk start-up time,and the critical invalidation start-up time.These findings can be used to improve smoke exhaust systems.