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Influence of the built environment on design fires

Wahlqvist, Jonathan LU and van Hees, Patrick LU (2016) In Case Studies in Fire Safety 5. p.20-33
Abstract

Design fires are often used to the evaluate performance based designs by fire protection engineers all over the world and can be an invaluable tool if used properly. One potential big issue however is the fact that the exact same design fire is recommended by authorities in similar building types despite the fact that some building characteristics, such as building material, can differ greatly. This paper focused on investigating several key characteristics of a building (building material, openings, room floor area size and ceiling height) and its effect on the design fire using computational fluid dynamics. When well to moderately insulating materials was used the design fire growth rate and maximum heat release rate was in many cases... (More)

Design fires are often used to the evaluate performance based designs by fire protection engineers all over the world and can be an invaluable tool if used properly. One potential big issue however is the fact that the exact same design fire is recommended by authorities in similar building types despite the fact that some building characteristics, such as building material, can differ greatly. This paper focused on investigating several key characteristics of a building (building material, openings, room floor area size and ceiling height) and its effect on the design fire using computational fluid dynamics. When well to moderately insulating materials was used the design fire growth rate and maximum heat release rate was in many cases significantly increased, especially if the room was well ventilated, the ceiling height was relatively low and the room floor area was moderate. However, using thermally thin materials (steel sheet) or materials with large heat storing capacity (concrete) very little change was seen on the growth rate or maximum heat release rate. In conclusion it was recommended that one should take precaution when using recommended design fires in buildings with certain characteristics since it potentially can overestimate the safety in such case.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Design fire, FDS, Numerical experiments, Oxygen depletion, Radiative feedback
in
Case Studies in Fire Safety
volume
5
pages
14 pages
publisher
Elsevier
external identifiers
  • Scopus:84954105364
ISSN
2214-398X
DOI
10.1016/j.csfs.2015.12.001
language
English
LU publication?
yes
id
591dbaff-98a2-4588-8743-a3c9c0b3d46f
date added to LUP
2016-05-10 13:05:52
date last changed
2016-05-10 13:05:52
@misc{591dbaff-98a2-4588-8743-a3c9c0b3d46f,
  abstract     = {<p>Design fires are often used to the evaluate performance based designs by fire protection engineers all over the world and can be an invaluable tool if used properly. One potential big issue however is the fact that the exact same design fire is recommended by authorities in similar building types despite the fact that some building characteristics, such as building material, can differ greatly. This paper focused on investigating several key characteristics of a building (building material, openings, room floor area size and ceiling height) and its effect on the design fire using computational fluid dynamics. When well to moderately insulating materials was used the design fire growth rate and maximum heat release rate was in many cases significantly increased, especially if the room was well ventilated, the ceiling height was relatively low and the room floor area was moderate. However, using thermally thin materials (steel sheet) or materials with large heat storing capacity (concrete) very little change was seen on the growth rate or maximum heat release rate. In conclusion it was recommended that one should take precaution when using recommended design fires in buildings with certain characteristics since it potentially can overestimate the safety in such case.</p>},
  author       = {Wahlqvist, Jonathan and van Hees, Patrick},
  issn         = {2214-398X},
  keyword      = {Design fire,FDS,Numerical experiments,Oxygen depletion,Radiative feedback},
  language     = {eng},
  month        = {05},
  pages        = {20--33},
  publisher    = {ARRAY(0x849f5f8)},
  series       = {Case Studies in Fire Safety},
  title        = {Influence of the built environment on design fires},
  url          = {http://dx.doi.org/10.1016/j.csfs.2015.12.001},
  volume       = {5},
  year         = {2016},
}