Refuge floors are fire safety requirements for tall buildings in many Asia-Oceania cities. However, there are concerns on the adequate provision of cross-ventilation and drencher system to openings on refuge floors. To review the existing situation, a survey of 44 building developments involving 51 blocks of both residential and non-residential tall buildings was conducted. A new fire safety parameter, i.e. the ratio of external wall openings areas to the nominal total wall areas of refuge floors (wall opening area ratio, or WOAR), was introduced to provide a quantitative measure in analysing fire safety level of tall buildings. To study how the ventilation provision is affected by WOAR, numerical simulations for the effect of natural ventilation on fire growth on the refuge floor were conducted by incorporating the wind data collected from the tallest building in Hong Kong. In the simulations, an office layout was adopted on both upper and lower floors for the sake of illustrating the possible smoke and heat spread from lower floor to upper floor (refuge floor). Finally, fire safety issues in relation to natural ventilation on fire in tall buildings were discussed. Suggestions in improving the fire safety design of tall buildings are proposed.
ChowWK.Aspect of fire safety in ultra high-rise buildings. Int J Eng Performance-Based Fire Codes2004;
6: 47–52.
2.
ChowWK.Evacuation in a supertall residential complex. J Appl Fire Sci2004–2005;
13: 291–300.
3.
ChowWK.Performance-based approach to determining fire safety provisions for buildings in the Asia-Oceania regions. Build Environ2015;
91: 127–137.
4.
ChengCKLamKMYuenKKLoSMLiangJ.A study of natural ventilation in a refuge floor. Build Environ2007;
42: 3322–3332.
5.
ChowCLChowWK.Fire safety aspects of refuge floors in supertall buildings with computational fluid dynamics. J Civil Eng Manage2009;
15: 225–236.
6.
ChowWKLiWA.J. Reduction in evacuation time for tall buildings through the use of skybridges. J Archit Plann Res2013;
30: 146–166.
7.
BartlettAIHaddenRMBisbyLA.A review of factors affecting the burning behaviour of wood for application to tall timber construction. Fire Technol. 2019;
55: 1–49.
8.
ChowWK. Fire aspects of supertall buildings. In: Seminar on key techniques and equipment for firefighting and rescue in supertall buildings, Shenzhen, China, 19 May 2018.
9.
Hong Kong Government, Buildings Department. Code of practice for means of escape.
Hong Kong:
Hong Kong Special Administrative Region, 1996.
10.
Hong Kong Government, Buildings Department. Code of practice on fire safety in buildings.
Hong Kong:
Hong Kong Special Administrative Region, 2015.
11.
LoSM.The use of designated refuge floors in high-rise buildings: Hong Kong perspective. J Appl Fire Sci1998;
7: 287–299.
12.
LoSMChenDHYuenKKLuWZ.A numerical study of external smoke spread in designated refuge floor. Build Environ2002;
37: 257–268.
13.
LuWZLoSMFangZYuenKK.A preliminary investigation of airflow field in designated refuge floor. Build Environ2001;
36: 219–230.
14.
YueTKChowWKFongNK. Numerical simulation on the effect of natural ventilation to fire growth and the formulation of fire protection strategy for supertall buildings. In: IAQVEC 2016: Proceedings of the 9th international conference on indoor air quality ventilation & energy conservation in buildings, 23–26 October 2016, Paper no. 1330, Seoul, Korea: Architectural Institute of Korea (AIK).
15.
ChowWKMaE.Experimental studies on patterns of water curtain discharged from eight nozzles of drencher system. J Appl Fire Sci2004–2005;
13: 125–137.
16.
LauKW.A study on installing water curtain system at refuge floor of supertall buildings in Hong Kong. PhD Thesis, The Hong Kong Polytechnic University, Hong Kong, 2014.
17.
ChowWKFongNKLuiGCHTamTKYueTK.Fire safety strategies for supertall buildings in Hong Kong. CTBUH J2013; 26–31.
18.
YuenKKRLoSMYeohGH. Numerical simulation of wind smoke effect on the designated refuge floor in high-rise buildings. In Interflame 99: conference on fire science and engineering, 29 June–1 July 1999, pp.1273–1280. Edinburgh: The University of Edinburg.
Hong Kong Government, Fire Services Department. Codes of practice for minimum fire service installations and equipment and inspection and testing of installations and equipment.
Hong Kong:
Hong Kong Special Administrative Region, 2012.
22.
Hong Kong Government, Architectural Services Department.General specification for fire service installation in government buildings of the Hong Kong Special Administrative Region (Incorporating Corrigendum No. GSFS01-2012).
Hong Kong:
Hong Kong Special Administrative Region, 2012.
23.
LuiCHFongNKLorenteSBejanAChowWK.Constructal design for pedestrian movement in living spaces: evacuation configurations. J Appl Phys2012;
111: 054903.
24.
Di SarliVDi BenedettoARussoG.Large eddy simulation of transient premixed flame–vortex interactions in gas explosions. Chem Eng Sci2012;
71: 539–551.
25.
Di SarliVDi BenedettoA.Sensitivity to the presence of the combustion submodel for large eddy simulation of transient premixed flame–vortex interactions. Ind Eng Chem Res2012;
51: 7704–7712.
26.
MaTGQuintiereJG.Numerical simulation of axi-symmetric fire plumes: accuracy and limitations. Fire Saf J2003;
38: 467–492.
27.
McGrattanKHostikkaSMcDermottRFloydJWeinschenkCOverholtK.Fire dynamics simulator (version 6) user’s guide. NIST Special Publication 1019-6.
USA:
National Institute of Standards and Technology, US Department of Commerce, November 2013.
28.
ChowWKYinR.A new model on simulating smoke transport with computational fluid dynamics. Build Environ2004;
39: 611–620.
29.
ChowWK.Use of computational fluid dynamics for simulating enclosure fires. J Fire Sci1995;
13: 300–334.
30.
ChowWKWongLTFungWY.Field measurement of the air flow characteristics of big mechanically ventilated spaces. Build Environ1996;
31: 541–550.
31.
ChowWKGaoYChowCL.A review on fire safety in buildings with glass façade. J Appl Fire Sci2006–2007;
16: 201–223.
32.
MiaoLChowCL.A study on window plume from a room fire to the cavity of a double-skin façade. Appl Therm Eng2018;
129: 230–241.
33.
ChowCL.Numerical studies on smoke spread in the cavity of a double-skin façade. J Civil Eng Manage2011;
17: 371–392.
34.
ChowCLChowWK.Heat release rate of accidental fire in a supertall building residential flat. Build Environ2010;
45: 1632–1640.
