Abstract
A calculation model for mechanical exhaust rate in large-space building in the case of cabin fire is proposed through theoretical analysis. Full-scale hot smoke tests are then performed to study the cabin fire spreading to large-space building at different air change rates (ACH). The result indicates that under the standard prescribed ACH, the effective air heights in the large spaces are respectively 6, 4 and 2 m in the case of cabin fires of 0.34, 0.67 and 1 MW. Numerical experiment has been conducted using self-developing two-zone model. The smoke control efficiency is compared by varying the large space’s air change rate in the case of cabin fires ranging from 0.25 to 4 MW. The calculation results show that the air change rates are respectively 3, 6, 10 and 10 ACH when the smoke layer is kept above 5 m, indicating that the centralized exhaust rates far exceed the standard prescribed value. To address this problem, a set of subsidiary distributed mechanical exhaust installing in the cabin with high fire loads is proposed. The simulation shows that both from the safety and economy point of view, the adoption of subsidiary distributed cabin exhaust design may effectively reduce the demand of designed air change rate for large-space building.
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References
Code for Fire Protection Design of Tall Buildings GB50045-95 (in Chinese), Beijing: Chinese Planning Press, 2001
NFPA. Guide for Smoke Management Systems in Malls, Atria and Large Areas, NFPA92B, Quincy: National Fire Protection Association, 1991(see also the 1995 edition)
Milke J A. Smoke Management in Covered Malls and Atria, SFPE Handbook of Fire Protection of Engineering. 2nd ed. Boston: Society of Fire Protection Engineers, 1995, 4: 246–258
Hansell G O, Morgan H P. Design approaches for smoke control in atrium buildings. Building Research Establishment Report BR 258, 1994
Klote J H. Fire and smoke control, an historical perspective. ASHRAE J, 1994, 36(7): 46–50
Shi C L, Li Y Z, Huo R, et al. Mechanical smoke exhaust for small retail shop fires. Int J Therm Sc, 2005, 44(5): 477–490
Chow W K. On the ‘cabins’ fire safety design concept in the new Hong Kong Airport Terminal Buildings. J Fire Sci, 1997, 15: 404–423
Zukoski E E, Kubota T, Cetegen B. Entrainment in fire plumes. Fire Safety J, 1980, 3(3): 107–121
Shi C L, Lu W Z, Chow W K, et al. An investigation on spill plume development and natural filling in large full-scale atrium under retail shop fire. Int J Heat and Mass Transfer, 2007, 50: 513–529
Shi C L. Study on enclosure fire growth and smoke movement in large space buildings (in Chinese), Dissertation for the Doctoral Degree, Hefei: University of Science and Technology of China, 2005
AS 4391-1999. Smoke management systems-Hot smoke test, 1999
Peacock R D, Forney G P, Reneke, P. et al. CFAST, the consolidated model of fire growth and smoke transport. NIST Technical Note, 1299, 1993
McCaffery B J. Momentum implications for buoyant diffusion flames. Combus Flame, 1983, 52(2): 149–167
Heskestad G. Engineering relations for fire plume. Fire Safety, 1984, 7(1): 25–32
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Supported partially by the National Natural Science Foundation of China (Grant Nos. 50674079 and 50579100)
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Shi, C., Zhong, M. & Huo, R. Investigation on mechanical exhaust of cabin fire in large-space building. Sci. China Ser. E-Technol. Sci. 51, 65–76 (2008). https://doi.org/10.1007/s11431-008-0006-z
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DOI: https://doi.org/10.1007/s11431-008-0006-z