Design of Fire Ventilation System for an Underground Car Park by CFD Simulations

Abstract:

The aim of this study is to design a fire ventilation system with impulse jet fans for an underground car park. During the planning, it is necessary to consider all aspects of fluid behaviour however, there is a number of parameters that can affect the flow of smoke that need to be considered. There is a good chance of miscalculations when computing the overall fluid flow using conventional plain calculations. To avoid mistakes, visualize the fluid flow and also to directly compare the different design variants it can be practical to use computer software, specifically CFD (Computational Fluid Dynamics) simulations. By CFD it is possible to better analyse and keep control of the flow of fluid, heat transfer and other related phenomena. It also helps predict the contamination level of Carbon Monoxide, heat and smoke intensity and distribution. In this study CFD simulations were used to design, test and compare two alternatives of fire ventilation system. The two alternatives differed from each other in the location of the impulse jet fans and exhaust ventilation shafts, and in the ventilation intensity (10-times per hour in the first alternative and 15-times per hour in the second alternative). The results have shown that the first alternative is not suitable as the car park was not sufficiently ventilated after 1500 seconds after the simulation had begun, whereas in the second alternative the smoke was almost completely exhausted and the visibility was significantly improved. The simulation results emphasize the important effect of design and location of the different elements on the functionality and efficiency of a fire protection system.

• Periodical: Applied Mechanics and Materials (Volume 887)
• Pages: 459-466
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.887.459
• Online since: January 2019
• Authors: Miroslava Kmecová*, Peter Buday, Jozef Vojtaššák, Michal Krajčík
• Keywords: CFD Simulation, Fire Ventilation, Smoke, Underground Car Park

References

[1] S.J. Ahn, H.M. Kwon, G.H. Kim, J.H. Yang, Study of securing required ventilation rates and improving MV systems for underground parking lots, Journal of Asian Architecture and Building Engineering 15 (2016) 659-665.

DOI: 10.3130/jaabe.15.659

[2] X. Deckers, S. Haga, N. Tilley, B. Merci, Smoke control in case of fire in a large car park: CFD Simulations of Full-Scale Configurations, Fire Safety Journal 57 (2013) 22-34.

DOI: 10.1016/j.firesaf.2012.02.005

[3] P.A. Enright, Impact of jet fan ventilation systems on sprinkler activation, Case Studies in Fire Safety 1 (2014) 1-7.

DOI: 10.1016/j.csfs.2013.11.002

[4] J.C.F. Teixeira, S.F.C.F. Teixeira, P. Cunha, A.M. Silva, Thermal Driven Dispersion of Smoke in a Parking Space. In: ASME 2016 International Mechanical Engineering Congress and Exposition; 11–17 November 2016; Phoenix, Arizona.

DOI: 10.1115/imece2016-67498

[5] J.C. Viegas, The use of impulse ventilation for smoke control in underground car parks, Tunnelling and Underground Space Technology 25 (2010) 42-53.

DOI: 10.1016/j.tust.2009.08.003

[6] S. Lu, Y.H. Wang, R.F. Zhang, H.P. Zhang, Numerical study on impulse ventilation for smoke control in an underground car park, Procedia Engineering 11 (2011) 369-378.

DOI: 10.1016/j.proeng.2011.04.671

[7] X.G. Zhang, Y.C. Guo, C.K. Chan, W.Y. Lin, Numerical simulations on fire spread and smoke movement in an underground car park, Building and Environment 42 (2007) 3466-3475.

DOI: 10.1016/j.buildenv.2006.11.002

[8] J. Glasa, L. Valasek, P. Weisenpacher, L. Halada, Use of PyroSim for simulation of cinema fire, Int. J. on Recent Trends in Engineering and Technology 7 (2012) 51-56.

[9] R. Wadhwani, D. Sutherland, A. Ooi, K. Moinuddin, G. Thorpe, Verification of a Lagrangian particle model for short-range firebrand transport, Fire Safety Journal, 31 July 2017. Epub ahead of print.

DOI: 10.1016/j.firesaf.2017.03.019

[10] M. Oravec, Industrial accidents [online], Košice, 2011, pp.11-18. Information on https://www.sjf.tuke.sk.

[11] ČSN 73 6058. Small, multi-storey and mass garages, (2011).

[12] STN EN 12101-3, Smoke and heat control systems – Part 3: Specification for powered smoke and heat control ventilators (Fans), (2015).

DOI: 10.3403/30218111

[13] BS 7346-7, Components for smoke and heat control systems. Code of practice on functional recommendations and calculation methods for smoke and heat control systems for covered car parks, (2013).

DOI: 10.3403/30264664

[14] Information on http://www.thunderheadeng.com.

[15] J. Smagorinsky, General Circulation Experiments with the Primitive Equations, Monthly Weather Review 91 (1963) 99-164.

DOI: 10.1175/1520-0493(1963)091<0099:gcewtp>2.3.co;2

[16] M. Germano, U. Piomelli, P. Moin, W. Cabot, A dynamic subgrid‐scale eddy viscosity model, Physics of Fluids 3 (1991) 1760-1765.

DOI: 10.1063/1.857955

[17] K. McGranttan, R.J. McDermott, Craig G. Weinschenk, Fire Dynamics Simulator Technical Reference Guide Volume 4: b. Configuration Management, [online]. USA, 2016, pp.1-8. Information on http://dx.doi.org/10.6028/NIST.SP.10184.

[18] S.T. McKenna, T.R. Hull, The fire toxicity of polyurethane foams, Fire Science Reviews 5 (2016) 1-27.

DOI: 10.1186/s40038-016-0012-3

[19] Y. Alarie, R.C. Anderson, Toxicologic classification of thermal decomposition products of synthetic and natural polymers, Toxicology and Applied Pharmacology 57 (1981) 181-188.

DOI: 10.1016/0041-008x(81)90278-7