Fires in Narrow Construction Cavities: Fire Dynamics and Material Fire Performance

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

Abstract

There have recently been devastating fire incidents related to fire spread over ventilated façades. These incidents indicate gaps in our understanding of the fire behaviour of façades. This thesis takes a bottom-up approach to investigating fire behaviour in materials and elements associated with narrow cavities in modern constructions. Ventilated façade is a construction used as an example in this thesis, in which an air gap is introduced between the thermal insulation and the external cladding.
Experimental and numerical studies were conducted of flame heights and heat fluxes to the surfaces inside cavities. An experimental programme comprising more than 75 individual tests was done with cavity widths between 2 cm and 10 cm, as well as four different heat release rates from the burner. The study showed increasing flame heights and heat flux as the cavity width is reduced. In this experimental study, the flame height increased up to 2.2 times compared to those near one wall. FDS version 6.7.0 software was then used to assess its capability to replicate the experimental results. One of the identified limitations of FDS was the required small mesh cell size. Furthermore, the thermal response of stone wool and expanded polystyrene when exposed to fire conditions was studied. Four types of stone wool with densities of 37 to 154 kg/m3 were investigated experimentally and numerically. Thermogravimetric analysis and micro combustion calorimetry were used to characterize the thermal decomposition of the stone wool’s organic content. A numerical heat conduction model was developed and showed capability of reproducing the temperatures inside stone wool with relatively low density. Suggestions are provided for improving the model’s performance for high density wools.

Detaljer

Författare
Enheter & grupper
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Annan samhällsbyggnadsteknik

Nyckelord

Originalspråkengelska
KvalifikationDoktor
Handledare/Biträdande handledare
  • Patrick van Hees, handledare
  • Bjarne Paulsen Husted, Biträdande handledare
  • Lauridsen, Dan, Biträdande handledare, Extern person
Sponsorer för avhandling
  • European Commission
  • Danish Institute of Fire and Security Technology
Tilldelningsdatum2020 feb 28
Förlag
  • Division of Fire Safety Engineering, Lund University
Tryckta ISBN978-91-7895-394-3
Elektroniska ISBN978-91-7895-395-0
StatusPublished - 2020 feb 28
PublikationskategoriForskning

Nedladdningar

Ingen tillgänglig data

Relaterad forskningsoutput

Karlis Livkiss, Husted, B. P., Beji, T. & Patrick van Hees, 2019, I : Fire Safety Journal. 108, 102834.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Karlis Livkiss, Blanca Andres, Abhishek Bhargava & Patrick van Hees, 2018 maj 1, I : Journal of Fire Sciences. 36, 3, s. 202-223 22 s.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Karlis Livkiss, Svensson, S., Husted, B. & Patrick van Hees, 2018, I : Fire Technology. 54, 3, s. 689-713

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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