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Analysis of the Influence of Construction Insulation Systems on Public Safety in China

View Article: PubMed Central - PubMed

ABSTRACT

With the Government of China’s proposed Energy Efficiency Regulations (GB40411-2007), the implementation of external insulation systems will be mandatory in China. The frequent external insulation system fires cause huge numbers of casualties and extensive property damage and have rapidly become a new hot issue in construction evacuation safety in China. This study attempts to reconstruct an actual fire scene and propose a quantitative risk assessment method for upward insulation system fires using thermal analysis tests and large eddy simulations (using the Fire Dynamics Simulator (FDS) software). Firstly, the pyrolysis and combustion characteristics of Extruded polystyrene board (XPS panel), such as ignition temperature, combustion heat, limiting oxygen index, thermogravimetric analysis and thermal radiation analysis were studied experimentally. Based on these experimental data, large eddy simulation was then applied to reconstruct insulation system fires. The results show that upward insulation system fires could be accurately reconstructed by using thermal analysis test and large eddy simulation. The spread of insulation material system fires in the vertical direction is faster than that in the horizontal direction. Moreover, we also find that there is a possibility of flashover in enclosures caused by insulation system fires as the smoke temperature exceeds 600 °C. The simulation methods and experimental results obtained in this paper could provide valuable references for fire evacuation, hazard assessment and fire resistant construction design studies.

No MeSH data available.


Related in: MedlinePlus

Surface temperature exposed to different heat fluxes.
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ijerph-13-00861-f003: Surface temperature exposed to different heat fluxes.

Mentions: K-thermocouples with high sensitivity are placed in tiny grooves at the XPS sample surface to collect the surface temperatures of XPS panels exposed to different radiation heat fluxes and the collected data is shown in Figure 3. From the collected surface temperatures and the video recorder, we can find that the surface temperature rapidly rises and reaches its maximum value once the XPS panel is ignited. With the combustion process, XPS panel eventually burn out and the surface temperature would drop correspondingly. We also find that the combustion point at which the XPS panels gets burnt is located between 336 °C and 387 °C, which is consistent with the ignition temperature obtained in Section 2.1. and referred to the reference temperature in the FDS simulation. The maximum surface temperatures in the whole combustion process are located between 933 °C and 970 °C with a mean value of 953 °C.


Analysis of the Influence of Construction Insulation Systems on Public Safety in China
Surface temperature exposed to different heat fluxes.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5036694&req=5

ijerph-13-00861-f003: Surface temperature exposed to different heat fluxes.
Mentions: K-thermocouples with high sensitivity are placed in tiny grooves at the XPS sample surface to collect the surface temperatures of XPS panels exposed to different radiation heat fluxes and the collected data is shown in Figure 3. From the collected surface temperatures and the video recorder, we can find that the surface temperature rapidly rises and reaches its maximum value once the XPS panel is ignited. With the combustion process, XPS panel eventually burn out and the surface temperature would drop correspondingly. We also find that the combustion point at which the XPS panels gets burnt is located between 336 °C and 387 °C, which is consistent with the ignition temperature obtained in Section 2.1. and referred to the reference temperature in the FDS simulation. The maximum surface temperatures in the whole combustion process are located between 933 °C and 970 °C with a mean value of 953 °C.

View Article: PubMed Central - PubMed

ABSTRACT

With the Government of China’s proposed Energy Efficiency Regulations (GB40411-2007), the implementation of external insulation systems will be mandatory in China. The frequent external insulation system fires cause huge numbers of casualties and extensive property damage and have rapidly become a new hot issue in construction evacuation safety in China. This study attempts to reconstruct an actual fire scene and propose a quantitative risk assessment method for upward insulation system fires using thermal analysis tests and large eddy simulations (using the Fire Dynamics Simulator (FDS) software). Firstly, the pyrolysis and combustion characteristics of Extruded polystyrene board (XPS panel), such as ignition temperature, combustion heat, limiting oxygen index, thermogravimetric analysis and thermal radiation analysis were studied experimentally. Based on these experimental data, large eddy simulation was then applied to reconstruct insulation system fires. The results show that upward insulation system fires could be accurately reconstructed by using thermal analysis test and large eddy simulation. The spread of insulation material system fires in the vertical direction is faster than that in the horizontal direction. Moreover, we also find that there is a possibility of flashover in enclosures caused by insulation system fires as the smoke temperature exceeds 600 °C. The simulation methods and experimental results obtained in this paper could provide valuable references for fire evacuation, hazard assessment and fire resistant construction design studies.

No MeSH data available.


Related in: MedlinePlus