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Use of plate thermometers for better estimate of fire development
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.ORCID iD: 0000-0002-3112-0270
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.ORCID iD: 0000-0003-4791-2341
2011 (English)In: Performance, Protection and Strengthening of Structures under Extreme Loading / [ed] Ezio Cadoni; Marco di Prisco, Trans Tech Publications Inc., 2011, p. 362-367Conference paper, Published paper (Refereed)
Abstract [en]

The concept of Adiabatic Surface Temperature (AST) opens possibilities to calculate heat transfer to a solid surface based on one temperature instead of two as is needed when heat transfer by both radiation and convection must be considered. The Adiabatic Surface Temperature is defined as the temperature of a surface which cannot absorb or lose heat to the environment, i.e. a perfect insulator. Accordingly, the AST is a weighted mean temperature of the radiation temperature and the gas temperature depending on the heat transfer coefficients. A determining factor for introducing the concept of AST is that it can be measured with a cheap and robust method called the plate thermometer (PT), even under harsh fire conditions. Alternative methods for measuring thermal exposure under similar conditions involve water cooled heat flux meters that are in most realistic situations difficult to use and very costly and impractical.This paper presents examples concerning how the concept of AST can be used in practice both in reaction-to-fire tests and in large scale scenarios where structures are exposed to high and inhomogeneous temperature conditions.

Place, publisher, year, edition, pages
Trans Tech Publications Inc., 2011. p. 362-367
Series
Applied Mechanics and Materials, ISSN 1660-9336 ; 82
National Category
Building Technologies
Research subject
Steel Structures
Identifiers
URN: urn:nbn:se:ltu:diva-32397Local ID: 6e5975df-fcd3-49ac-8045-ab4475e14c38OAI: oai:DiVA.org:ltu-32397DiVA, id: diva2:1005631
Conference
International Workshop on Performance, Protection and Strengthening of Structures under Extreme Loading : 30/08/2011 - 01/09/2011
Note
Validerad; 2011; 20111024 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-06-08Bibliographically approved
In thesis
1. Compartment Fire Temperature Calculations and Measurements
Open this publication in new window or tab >>Compartment Fire Temperature Calculations and Measurements
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Mätning och beräkning av temperatur i brandceller
Abstract [en]

This thesis is devoted to heat transfer and fire dynamics in enclosures. It consists of a main part which summarizes and discusses the theory of heat transfer, conservation of energy, fire dynamics and specific fire scenarios that have been studied. In the second part of this thesis, the reader will find an Appendix containing seven scientific publications in this field.

In particular, one- and two-zone compartment fire models have been studied. A new way of calculating fire temperatures of pre- and post-flashover compartment fires is presented. Three levels of solution techniques are presented including closed form analytical expressions, spread-sheet calculations and solutions involving general finite element temperature calculations. Validations with experiments have shown good accuracy of the calculation models and that the thermal properties of the surrounding structures have a great impact on the fire temperature development. In addition, the importance of the choice of measurement techniques in fire engineering has been studied. Based on the conclusions from these studies, the best techniques have been used in further experimental studies of different fire scenarios.

Abstract [sv]

Denna avhandling behandlar problem kopplade till värmeöverföring och branddynamik i slutna utrymmen med tonvikt på värmeöverföring mellan gaser och utsatta konstruktioner. Avhandlingen består av en huvuddel och ett appendix innehållande sju vetenskapliga artiklar. I huvuddelen sammanfattas och diskuteras grundläggande teorier och principer inom värmeöverföring och branddynamik samt studier av ett antal specialfall av brandscenarion som baseras på dessa teorier. I de avslutande bilagorna (Artiklar A1-A3 och Artiklar B1-B2) finns sju vetenskapliga artiklar som grundligare beskriver de ovan nämnda specialfallen.

Huvudfokus i avhandlingen ligger på temperaturutveckling vid brand i slutna utrymmen. I avhandlingen studeras i synnerhet en- och två-zonsmodeller för brand i slutna utrymmen, och en ny metod för att beräkna brandgastemperaturer före och efter övertändning i rumsbränder är framtagen. Validering av dessa modeller med experiment visar att deras noggrannhet är bra. Modellerna visar också att de termiska egenskaperna hos de omgivande ytorna har stor inverkan på brandtemperatursutvecklingen. I tillägg studeras i denna avhandling betydelsen av val av mätmetoder i brandtekniska tillämpningar. På grundval av slutsatserna från dessa studier har de främsta mätteknikerna använts i ytterligare experimentella studier av olika brandscenarier.

Place, publisher, year, edition, pages
Luleå University of Technology, 2017
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Keywords
compartment fire temperature, heat transfer, FEM, calculation of temperature, temperature measurement, fire scenario, validation, flashover
National Category
Other Engineering and Technologies
Research subject
Steel Structures
Identifiers
urn:nbn:se:ltu:diva-59927 (URN)978-91-7583-812-0 (ISBN)978-91-7583-813-7 (ISBN)
Public defence
2017-03-20, F1031, Luleå tekniska universitet, Luleå, 13:00 (English)
Opponent
Supervisors
Available from: 2017-02-09 Created: 2016-10-24 Last updated: 2017-12-01Bibliographically approved

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Other links

http://www.scientific.net/AMM.82.362http://www.scientific.net/AMM.82.362.pdf

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Byström, AlexandraWickström, UlfVeljkovic, Milan

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