Author:
Chen Yanqiu,Zhou Xiaodong,Zhang Taolin,Fu Zhijian,Hu Yuqi,Yang Lizhong
Abstract
Purpose
– The purpose of this paper is to study the behavior of smoke flow in building fires and optimize the design of smoke control systems.
Design/methodology/approach
– A total of 435 3-D fire simulations were conducted through NIST fire dynamics simulator to analyze thermal behavior of combined buoyancy-induced and pressure-driven smoke flow in complex vertical shafts, under consideration of influence of heat release rate (HRR) and locations of heat sources. This influence was evaluated through neutral pressure plane (NPP), which is a critical plane depicting the flow velocity distributions. Hot smoke flows out of shafts beyond the NPP and cold air flows into shafts below the NPP.
Findings
– Numerical simulation results show that HRR of heat source has little influence on NPP, while location of heat source can make a significant difference to NPP, particularly in cases of multi-heat source. Identifying the location of NPP helps to develop a more effective way to control the smoke with less energy consumption. Through putting an emphasis on smoke exhausting beyond the NPP and air supplying below the NPP, the smoke control systems can make the best use of energy.
Research limitations/implications
– Because of the chosen research approach, the research results may need to be tested by further experiments.
Practical implications
– The paper includes implications for the optimization of smoke control systems design in buildings.
Originality/value
– This paper fulfills an identified need to research the behavior of hot smoke in building fires and optimize the design of smoke control systems.
Subject
Applied Mathematics,Computer Science Applications,Mechanical Engineering,Mechanics of Materials
Reference38 articles.
1. Abib, A.H.
and
Jaluria, Y.
(1996), “Generation of stable thermal stratification in a partially enclosed space due to a room fire”,
International Journal of Numerical Methods for Heat & Fluid Flow
, Vol. 6 No. 8, pp. 31-52.
2. Andreozzi, A.
,
Bianco, N.
,
Manca, O.
and
Naso, V.
(2013), “Turbulent mixed convection in a uniformly heated vertical channel with an assisting moving surface”,
International Journal of Thermal Sciences
, Vol. 71, pp. 20-31, doi: 10.1016/j.ijthermalsci.2013.04.001.
3. Black, W.Z.
(2009a), “Smoke movement in elevator shafts during a high-rise structural fire”,
Fire Safety Journal
, Vol. 44 No. 2, pp. 168-182.
4. Black, W.Z.
(2009b), “Use of air-handling equipment to manage smoke movement during a high-rise fire”,
ASHRAE Transactions
, Vol. 115 No. 1, pp. 165-181.
5. Cheng, C.C.K.
,
Leung, A.Y.T.
,
Lam, K.M.
,
Demirbilek, F.N.
and
Williamson, B.J.
(2010), “A CFD study of Hong Kong refuge floor design: floor height effect”,
Engineering Applications of Computational Fluid Mechanics
, Vol. 4 No. 3, pp. 425-433.
Cited by
9 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献