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Thermal characterisation of the cooling phase of post-flashover compartment fires [Elektronski vir]Lucherini, Andrea ...The main characteristics of the cooling phase of post-flashover compartment fires are studied using a simplified first-principles heat transfer approach to establish key limitations of more ... traditional methodologies (e.g., Eurocode). To this purpose, the boundary conditions during cooling are analysed. To illustrate the importance of a first-principles approach, a detailed review of the literature is presented followed by the presentation of a simplified numerical model. The model is constructed to calculate first-order thermal conditions during the cooling phase. The model is not intended to provide a precise calculation method but rather baseline estimates that incorporate all key thermal inputs and outputs. First, the thermal boundary conditions in the heating phase are approximated with a single (gas) temperature and the Eurocode parametric fire curves, to provide a consistent initial condition for the cooling phase and to be able to compare the traditional approach to the first- principles approach. After fuel burnout, the compartment gases become optically thin and temperatures decay to ambient values, while the compartment solid elements slowly cool down. For simplicity, convective cooling of the compartment linings is estimated using a constant convective heat transfer coefficient and all linings surfaces are assumed to have the same temperature (no net radiative heat exchange). All structural elements are assumed to be thermally thick. While these simplifications introduce quantitative errors, they enable an analytical solu- tion for transient heat conduction in a semi-infinite solid that captures all key heat transfer processes. Com- parisons between the results obtained using both approaches highlight how, even when considering the same fire energy input, the thermal boundary conditions according to the Eurocode parametric fire curves lead to an in- crease energy accumulated in the solid after fuel burnout and a delay in the onset of cooling. This is not physically correct, and it may lead to misrepresentation of the impact of post-flashover fires on structural behaviour.Source: International journal of thermal sciences [Elektronski vir]. - ISSN 1778-4166 (Vol. 199, [article no.] 108933, May 2024, str. 1-15)Type of material - e-article ; adult, seriousPublish date - 2024Language - englishCOBISS.SI-ID - 191239939
Author
Lucherini, Andrea |
Jovanović, Balša |
Torero, Jose L. |
Van Coile, Ruben |
Merci, Bart
Topics
faza hlajenja |
razpadanje požara |
dinamika požara |
požari v oddelkih |
konstrukcijski požarni inženiring |
požarna varnost |
cooling phase |
fire decay |
fire dynamics |
compartment fires |
structural fire engineering |
fire safety
Author | Lucherini, Andrea ... |
Title | Thermal characterisation of the cooling phase of post-flashover compartment fires [Elektronski vir] |
Publication date | 2024-02-02 |
COBISS.SI-ID | 191239939 |
Publication version in repository | Publisher's version |
Publication licence | Creative Commons Attribution 4.0 International |
Embargo | Immediate publication for public |
Project(s) from which the publication was funded
Title | Acronym | Project ID | Funder |
---|---|---|---|
Fire-safe Sustainable Built Environment | FRISSBE | 952395 |
European Commission |
Fundamental advances for the fire safety of tall timber structures including the fire decay phase | FIReSafeTimber | 101064840 |
European Commission |
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https://www.sciencedirect.com/science/article/pii/S1290072924000553 |
https://dirros.openscience.si/IzpisGradiva.php?id=18678 |
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Lucherini, Andrea | 56534 |
Jovanović, Balša | |
Torero, Jose L. | |
Van Coile, Ruben | |
Merci, Bart |
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