Effect of variable air volume exhaust system on vehicle fire evacuation safety in underground garage

FDS is used to simulate and analyse the development of vehicle fires and the human evacuation safety in underground garage based on the analysis of the following parameters in fire scenario, such as the changes of the heat release rate, the average temperature, and concentrations of carbon dioxide on the Z)1.8 m plane in central corridor under different conditions of mechanical exhaust ways. The results show that, the Variable Air Volume (VAV) exhaust system has better control effectiveness to the fire temperature and smoke than the Scheduled Air Volume (SAV) exhaust system has, and the heat release rate with VAV is sharply decreased between 250 s and 350 s, and the safety evacuation performance of exit is also increased. For the garage, when air circulation ratio is changed from 30 times/hour to 40 times/hour at 300 s, the effect of smoke evacuation is the best.

Authors: Zhang, Peihong; Gong, Yuqi; Wang, Kan. ;Full Source: Shenyang Jianzhu Daxue Xuebao, Ziran Kexueban 2011, 27(3), 547-551 (China). ;