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Temperature measurements and modelling of flashed over compartment fires
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
SP Sveriges Tekniska Forskningsinstitut, Brandteknik.
Number of Authors: 3
2016 (English)In: Proceedings of 14th International Conference and Exhibition on Fire Science and Engineering, 2016, Vol. 2, 949-960 p., 12Conference paper (Refereed)
Abstract [en]

This paper describes and validates by comparisons with test results a one-zone model for computing temperatures of compartment fires where flashover is reached. The model is based on an analysis of the energy and mass balance of a fully developed (ventilation controlled) compartment fire. It is demonstrated in this paper that the model can be used to predict fire temperatures in compartments with semi-infinite boundaries as well as with boundaries of insulated or uninsulated steel sheets where so called lumped heat capacity can be assumed. Comparisons are made with a series of experiments in compartments of light weight concrete, and insulated and non-insulated single sheet steel structures. A general finite element code has been used to calculate the temperature in the surrounding structures. The in this manner calculated surface temperatures yield the fire temperature as a function of time. By using a numerical tool like a finite element code it is possible to analyse fire compartment surrounding structures of various kinds and combinations of materials.Two new characteristic compartment fire temperatures have been introduced in this paper. They are the ultimate compartment fire temperature, which is the temperature reached when heat losses to surrounding structures as well radiation out through openings can be neglected, and the maximum compartment fire temperature, which is the temperature when only the losses to surrounding structures are neglected.The experiments referred to were accurately defined and surveyed. In all the tests a propane gas burner was used as the only fire source. Temperatures were measured with thermocouples and plate thermometers at several positions, and oxygen concentrations were measured in the fire compartment only opening. In some tests the heat release rate as well as the CO2 and CO concentrations were measured as well (Sjöström, et al., 2016).

Place, publisher, year, edition, pages
2016. Vol. 2, 949-960 p., 12
National Category
Building Technologies
Research subject
Steel Structures
Identifiers
URN: urn:nbn:se:ltu:diva-40724Local ID: ff6b830d-9aa3-4da1-ae6e-07cc711d4b97OAI: oai:DiVA.org:ltu-40724DiVA: diva2:1014245
Conference
International Conference and Exhibition on Fire Science and Engineering : 04/07/2016 - 06/07/2016
Note

För godkännande; 2016; 20160823 (alebys)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2016-12-06Bibliographically approved

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http://www.intersciencecomms.co.uk/html/conferences/Interflam/If16/if16%20Table%20of%20Contents.pdf

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Wickström, UlfByström, Alexandra
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