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New approach to estimate temperatures in pre-flashover fires: Lumped heat case
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
Luleå University of Technology, Sweden.
2015 (English)In: Fire safety journal, ISSN 0379-7112, E-ISSN 1873-7226, Vol. 72, p. 77-86Article in journal (Refereed) Published
Abstract [en]

This paper presents a model for estimating temperatures in pre-flashover fires where the fire enclosure boundaries are assumed to have lumped heat capacity. That is, thermal inertia is concentrated to one layer with uniform temperature and insulating materials are considered purely by their heat transfer resistance. The model yields a good understanding of the heat balance in a fire enclosure and was used to predict temperatures in insulated and non-insulated steel-bounded enclosures. Comparisons were made with full scale experiments and with other predictive methods, including CFD modeling with FDS and the so called MQH relationship. Input parameter values to the model were then taken from well-known literature and the heat release rateswere provided from the experiments. The fire temperature predictions of the model matched very well with experimental data. So did the FDS predictions while the original MQH relationship gave unrealistic results for the problems studied. Major benefits of using the model in comparison with CFD modeling are its readiness and simplicity as well as the negligible computation times needed. An Excel application of the presented pre-flashover fire model is available on request from the author.

Place, publisher, year, edition, pages
2015. Vol. 72, p. 77-86
Keywords [en]
Temperature prediction, Fire temperature, Zone model, Pre-flashover, Heat transfer, Compartment fire
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-6827DOI: 10.1016/j.firesaf.2015.02.008Local ID: 23624OAI: oai:DiVA.org:ri-6827DiVA, id: diva2:964667
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2019-07-05Bibliographically approved

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