Fire-induced pressure and smoke spreading in mechanically ventilated buildings with air-tight envelopes

Simo Hostikka, Rahul Kallada Janardhan, Umar Riaz, Topi Sikanen

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

    Abstract

    Fire-induced pressures have not been considered dangerous in building fires, but the situation may be changing as building envelopes become increasingly air-tight. In this study, we investigate whether this can change the fire development and pose new risks for structural and evacuation safety. We used experiments to validate the numerical models, and models for simulating the fire development in buildings with different air-tightness levels. The simulations considered air permeability values typical for traditional, modern and Near-Zero buildings. Three different smoke damper configurations were studied, and the fire growth rates were varied from medium to ultra-fast. The results showed that transitioning from traditional and modern buildings to Near-Zero buildings can sufficiently increase the peak overpressures from fast-growing fires to cause structural damage. Conditions were identified for avoiding excessively high overpressures, while preventing smoke from spreading through the ventilation system.
    Original languageEnglish
    Title of host publication12th International Symposium on Fire Safety Science
    Subtitle of host publicationBook of Abstracts
    Pages40
    Publication statusPublished - 2017
    Event12th International Symposium on Fire Safety Science, IAFSS 2017 - Lund, Sweden
    Duration: 12 Jun 201716 Jun 2017
    Conference number: 12
    http://www.iafss2017.se/ (Web page)

    Conference

    Conference12th International Symposium on Fire Safety Science, IAFSS 2017
    Abbreviated titleIAFSS 2017
    CountrySweden
    CityLund
    Period12/06/1716/06/17
    Internet address

    Fingerprint

    Smoke
    Fires
    Air
    Air permeability
    Ventilation
    Numerical models
    Experiments

    Keywords

    • pressure
    • modelling
    • CFD
    • smoke
    • airtightness
    • near-zero buildings
    • high-rise buildings

    Cite this

    Hostikka, S., Janardhan, R. K., Riaz, U., & Sikanen, T. (2017). Fire-induced pressure and smoke spreading in mechanically ventilated buildings with air-tight envelopes. In 12th International Symposium on Fire Safety Science: Book of Abstracts (pp. 40)
    Hostikka, Simo ; Janardhan, Rahul Kallada ; Riaz, Umar ; Sikanen, Topi. / Fire-induced pressure and smoke spreading in mechanically ventilated buildings with air-tight envelopes. 12th International Symposium on Fire Safety Science: Book of Abstracts. 2017. pp. 40
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    Hostikka, S, Janardhan, RK, Riaz, U & Sikanen, T 2017, Fire-induced pressure and smoke spreading in mechanically ventilated buildings with air-tight envelopes. in 12th International Symposium on Fire Safety Science: Book of Abstracts. pp. 40, 12th International Symposium on Fire Safety Science, IAFSS 2017, Lund, Sweden, 12/06/17.

    Fire-induced pressure and smoke spreading in mechanically ventilated buildings with air-tight envelopes. / Hostikka, Simo; Janardhan, Rahul Kallada; Riaz, Umar; Sikanen, Topi.

    12th International Symposium on Fire Safety Science: Book of Abstracts. 2017. p. 40.

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

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    AU - Riaz, Umar

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    Y1 - 2017

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    AB - Fire-induced pressures have not been considered dangerous in building fires, but the situation may be changing as building envelopes become increasingly air-tight. In this study, we investigate whether this can change the fire development and pose new risks for structural and evacuation safety. We used experiments to validate the numerical models, and models for simulating the fire development in buildings with different air-tightness levels. The simulations considered air permeability values typical for traditional, modern and Near-Zero buildings. Three different smoke damper configurations were studied, and the fire growth rates were varied from medium to ultra-fast. The results showed that transitioning from traditional and modern buildings to Near-Zero buildings can sufficiently increase the peak overpressures from fast-growing fires to cause structural damage. Conditions were identified for avoiding excessively high overpressures, while preventing smoke from spreading through the ventilation system.

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    Hostikka S, Janardhan RK, Riaz U, Sikanen T. Fire-induced pressure and smoke spreading in mechanically ventilated buildings with air-tight envelopes. In 12th International Symposium on Fire Safety Science: Book of Abstracts. 2017. p. 40