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Experimental and Analytical Characterization of Firebrand Ignition of Home Insulation Materials

  • Savannah S. Wessies
  • Michael K. Chang
  • Kevin C. Marr
  • Ofodike A. EzekoyeEmail author
Article

Abstract

Wildland firebrands are known to ignite materials in attic spaces of homes. To clarify the effects of choices in attic insulation materials for homes located at the wildland urban interface, this study seeks to characterize the effects of firebrand characteristics on the ignition propensity of several common insulation materials: polyurethane foam, expanded polystyrene (EPS), extruded polystyrene (XPS), flame retarded and non-flame retarded denim, and flame retarded and non-flame retarded loosefill cellulose. An experimental system was developed to explore the effects of firebrand heating, air flow, and firebrand configuration on ignition. For an equal initial mass of wooden material, two firebrand configurations were generated: a single whole firebrand and multiple (five) fragmented firebrands. Relative to whole firebrands, the fragmented firebrands were found to more reliably ignite the insulation materials. Thermoplastic insulation material would only ignite in a temporary flash flame, but did not support sustained burning. Following the flash flame, the firebrands would melt through the synthetic polymer material (XPS and EPS) and cease smoldering. Cellulosic insulation materials would ignite in a sustained fire provided that there was adequate air flow. A simple heat and mass transfer model was developed to describe the ignition process due to firebrand deposition. Traditional lab-scale experiments, thermogravimetric analysis and cone calorimetry, were performed to parameterize the model. Results followed experimentally observed firebrand temperature patterns. There was an average error of approximately 8.5% between firebrand temperature model predictions and experimental measurements. Also, consistent with the experimental results, the model predicted that increasing air flow increased ember temperature and reduced the time to ignition for cases in which ignition occurs.

Keywords

Wildland-fire Firebrand Thermal insulation Ignition-model 

Notes

Acknowledgements

Funding was provided by the Department of Commerce through NIST (Grant no. 60NANB16D278) and by the Department of Interior through the Joint Fire Science Program under Project JFSP 15-1-04-4.

References

  1. 1.
    Martinuzzi S, Stewart SI, Helmers DP, Mockrin MH, Hammer RB, Radeloff VC (2015) The 2010 wildland-urban interface of the conterminous united states. Research Map NRS-8. US Department of Agriculture, Forest Service, Northern Research Station, Newtown Square, PA. 124 pp [includes pull-out map], 8:1–124Google Scholar
  2. 2.
    Caton SE, Hakes RSP, Gorham DJ, Zhou A, Gollner MJ (2017) Review of pathways for building fire spread in the wildland urban interface part i: exposure conditions. Fire Technol 53(2):429–473.  https://doi.org/10.1007/s10694-016-0589-z.CrossRefGoogle Scholar
  3. 3.
    Manzello SL, Shields JR, Yang JC, Hayashi Y, Nii D (2007) On the use of a firebrand generator to investigate the ignition of structures in wildland–urban interface (WUI) fires. In: 11th International conference on fire science and engineering (INTERFLAM), pp 3–5Google Scholar
  4. 4.
    Long AJ, Randall CK (2004) Wildfire risk assessment guide for homeowners in the southern United States. School of Forest Resources and Conservation, University of FloridaGoogle Scholar
  5. 5.
    Quarles SL, Valachovic Y, Nakamura GM, Nader GA, De Lasaux MJ (2010) Home survival in wildfire-prone areas: building materials and design considerations. ANR Publication, p 8393Google Scholar
  6. 6.
    Quarles S, Sindelar M et al (2011) Wildfire ignition resistant home design (WIRHD) program: full-scale testing and demonstration final report. Technical report, USDA Forest Service-Savannah River, New Ellenton, SCGoogle Scholar
  7. 7.
    Wang S, Huang X, Chen H, Liu N, Rein G (2015) Ignition of low-density expandable polystyrene foam by a hot particle. Combust Flame 162(11):4112–4118CrossRefGoogle Scholar
  8. 8.
    Hadden RM, Scott S, Lautenberger C, Fernandez-Pello AC (2011) Ignition of combustible fuel beds by hot particles: an experimental and theoretical study. Fire Technol 47(2):341–355CrossRefGoogle Scholar
  9. 9.
    Urban JL, Zak CD, Fernandez-Pello C (2018) Spot fire ignition of natural fuels by hot aluminum particles. Fire Technol. 54(3):797–808CrossRefGoogle Scholar
  10. 10.
    Wang S, Huang X, Chen H, Liu N (2017) Interaction between flaming and smouldering in hot-particle ignition of forest fuels and effects of moisture and wind. Int J Wildland Fire 26(1):71–81CrossRefGoogle Scholar
  11. 11.
    Manzello SL, Cleary TG, Shields JR, Maranghides A, Mell W, Yang JC (2008) Experimental investigation of firebrands: generation and ignition of fuel beds. Fire Saf J 43(3):226–233CrossRefGoogle Scholar
  12. 12.
    Ganteaume A, Lampin-Maillet C, Guijarro M, Hernando C, Jappiot M, Fonturbel T, Pérez-Gorostiaga P, Vega JA (2010) Spot fires: fuel bed flammability and capability of firebrands to ignite fuel beds. Int J Wildland Fire 18 (8):951–969CrossRefGoogle Scholar
  13. 13.
    Warey A (2018) Influence of thermal contact on heat transfer from glowing firebrands. Case Stud Therm Eng 12:301–311.  https://doi.org/10.1016/j.csite.2018.04.018 CrossRefGoogle Scholar
  14. 14.
    Yin P, Liu N, Chen H, Lozano JS, Shan Y (2014) New correlation between ignition time and moisture content for pine needles attacked by firebrands. Fire Technol 50(1):79–91CrossRefGoogle Scholar
  15. 15.
    Gol’dshleger UI, Pribytkova KV, Barzykin VV (1973) Ignition of a condensed explosive by a hot object of finite dimensions. Combust Explos Shock Waves 9(1):99–102CrossRefGoogle Scholar
  16. 16.
    Jones JC (1993) Predictive calculations of the effect of an accidental heat source on a bed of forest litter. J Fire Sci 11(1):80–86CrossRefGoogle Scholar
  17. 17.
    Jones JC (1995) Improved calculations concerning the ignition of forest litter by hot particle ingress. J Fire Sci 13(5):350–356CrossRefGoogle Scholar
  18. 18.
    Babrauskas V (2003) Ignition handbook. Fire Science Publishers, Issaquah, WA. ISBN: 0972811133Google Scholar
  19. 19.
    Lautenberger C, Fernandez-Pello AC (2009) Spotting ignition of fuel beds by firebrands. WIT Trans Model Simul 48:603–612CrossRefGoogle Scholar
  20. 20.
    Manzello SL, Maranghides A, Shields JR, Mell WE, Hayashi Y, Nii D (2007) Measurement of firebrand production and heat release rate (HRR) from burning Korean pine trees. Fire Saf Sci 7:108–108Google Scholar
  21. 21.
    El Houssami M, Mueller E, Filkov A, Thomas JC, Skowronski N, Gallagher MR, Clark K, Kremens R, Simeoni A (2016) Experimental procedures characterising firebrand generation in wildland fires. Fire Technol 52(3):731–751CrossRefGoogle Scholar
  22. 22.
    International Code Council (2018) International residential code for one-and two-family dwellings. International Code CouncilGoogle Scholar
  23. 23.
    Damant GH, Williams SS, McCormack JA (1983) The role of fabric in the cigarette ignition of upholstered furniture. J Fire Sci 1(5):309–321CrossRefGoogle Scholar
  24. 24.
    Zak CD (2015) The effect of particle properties on hot particle spot fire ignition. University of California, BerkeleyGoogle Scholar
  25. 25.
    Persoons T, McGuinn A, Murray DB (2011) A general correlation for the stagnation point Nusselt number of an axisymmetric impinging synthetic jet. Int J Heat Mass Transf 54(17):3900–3908.  https://doi.org/10.1016/j.ijheatmasstransfer.2011.04.037 CrossRefzbMATHGoogle Scholar
  26. 26.
    Bergman TL, Incropera FP, DeWitt DP, Lavine AS (2011) Fundamentals of heat and mass transfer. Wiley, New YorkGoogle Scholar
  27. 27.
    Drysdale D (2011) An introduction to fire dynamics. Wiley, New YorkCrossRefGoogle Scholar
  28. 28.
    Bamford CH, Crank J, Malan DH (1946) The combustion of wood. Part I. In: Mathematical proceedings of the Cambridge Philosophical Society, vol 42, pp 166–182. Cambridge University PressGoogle Scholar
  29. 29.
    Drysdale DD, Thomson HE (1989) Flammability of plastics ii: critical mass flux at the firepoint. Fire Saf J 14(3):179–188.  https://doi.org/10.1016/0379-7112(89)90071-4 CrossRefGoogle Scholar
  30. 30.
    Tsai T-H, Li M-J, Shih I-Y, Jih R, Wong S-C (2001) Experimental and numerical study of autoignition and pilot ignition of PMMA plates in a cone calorimeter. Combust Flame 124(3):466–480CrossRefGoogle Scholar
  31. 31.
    Gani A, Naruse I (2007) Effect of cellulose and lignin content on pyrolysis and combustion characteristics for several types of biomass. Renew Energy 32(4):649–661.  https://doi.org/10.1016/j.renene.2006.02.017 CrossRefGoogle Scholar
  32. 32.
    Nassar MM, Ashour EA, Wahid SS (1996) Thermal characteristics of bagasse. J Appl Polym Sci 61(6): 885–890CrossRefGoogle Scholar
  33. 33.
    Munir S, Daood SS, Nimmo W, Cunliffe AM, Gibbs BM (2009) Thermal analysis and devolatilization kinetics of cotton stalk, sugar cane bagasse and shea meal under nitrogen and air atmospheres. Bioresour Technol 100(3):1413–1418CrossRefGoogle Scholar
  34. 34.
    Wang Q, Li J, Winandy JE (2004) Chemical mechanism of fire retardance of boric acid on wood. Wood Sci Technol 38(5): 375–389CrossRefGoogle Scholar
  35. 35.
    Mostashari SM, Mostashari SZ (2008) Combustion pathway of cotton fabrics treated by ammonium sulfate as a flame-retardant studied by TG. J Therm Anal Calorim 91 (2):437–441CrossRefGoogle Scholar
  36. 36.
    Roberts BC (2017) Fire safety in sustainable buildings: status, options, alternatives. The University of California at Austin, AustinGoogle Scholar
  37. 37.
    Bakhtiyari S, Taghi-Akbari L, Barikani M (2010) The effective parameters for reaction-to-fire properties of expanded polystyrene foams in bench scale. Iran Polym J 19:27–37Google Scholar
  38. 38.
    Irvine DJ, McCluskey JA, Robinson IM (2000) Fire hazards and some common polymers. Polym Degrad Stab 67(3):383–396CrossRefGoogle Scholar
  39. 39.
    Usta N (2012) Investigation of fire behavior of rigid polyurethane foams containing fly ash and intumescent flame retardant by using a cone calorimeter. J Appl Polym Sci 124(4):3372–3382.  https://doi.org/10.1002/app.35352.CrossRefGoogle Scholar
  40. 40.
    White RH, Nam S, Parikh DV (2013) Cone calorimeter evaluation of two flame retardant cotton fabrics. Fire Mater 37(1):46–57CrossRefGoogle Scholar
  41. 41.
    Dlugogorski BZ, Hirunpraditkoon S, Kennedy EM (2014) Ignition temperature and surface emissivity of heterogeneous loosely packed materials from pyrometric measurements. Fire Saf Sci 11:262–275CrossRefGoogle Scholar
  42. 42.
    Dorez G, Ferry L, Sonnier R, Taguet A, Lopez-Cuesta J-M (2014) Effect of cellulose, hemicellulose and lignin contents on pyrolysis and combustion of natural fibers. J Anal Appl Pyrol 107:323–331.  https://doi.org/10.1016/j.jaap.2014.03.017 CrossRefGoogle Scholar
  43. 43.
    Schartel B, Hull TR (2007) Development of fire-retarded materials–interpretation of cone calorimeter data. Fire Mater 31(5):327–354CrossRefGoogle Scholar
  44. 44.
    Schartel B, Bartholmai M, Knoll U (2005) Some comments on the use of cone calorimeter data. Polym Degrad Stab 88(3):540–547CrossRefGoogle Scholar
  45. 45.
    An W, Jiang L, Sun J, Liew KM (2015) Correlation analysis of sample thickness, heat flux, and cone calorimetry test data of polystyrene foam. J Therm Anal Calorim 119(1):229–238CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Savannah S. Wessies
    • 1
  • Michael K. Chang
    • 1
  • Kevin C. Marr
    • 1
  • Ofodike A. Ezekoye
    • 1
    Email author
  1. 1.Department of Mechanical EngineeringThe University of Texas at AustinAustinUSA

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