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Erschienen in:

16.06.2023 | Manuscript

Automatic Fire Sprinkler Activation Time with Quadratic Fire Growth

verfasst von: Ramon Toldrà

Erschienen in: Fire Technology | Ausgabe 5/2023

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Abstract

Fires with a heat release rate that grows quadratically in time and levels off after the first automatic fire sprinkler is activated are routinely used in evaluating the consequences of fire in performance based design projects. In order to calculate the sprinkler activation time one needs to solve the differential equation that governs the heat transfer between the ceiling jet and the sensing element of the automatic fire sprinkler, an equation that depends on the temperature and velocity of the gas. Well-known empirical correlations between ceiling jet properties and heat release rate as well as numerical simulations can be used to determine the temperature and velocity of the gas. Here a comparison and discussion of the results obtained for the activation time and activation heat release rate using both approaches is presented, which can help authorities having jurisdiction to assess safety reports when there are no clear regulations about which method should be applied.

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Fußnoten
1
For a viscous fluid the velocity must vanish on the ceiling and hence there must be a maximum at a short distance from the ceiling. To resolve the maximum in a simulation one should take cell sizes smaller than 5 cm, which is beyond the scope of this work.
 
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Metadaten
Titel
Automatic Fire Sprinkler Activation Time with Quadratic Fire Growth
verfasst von
Ramon Toldrà
Publikationsdatum
16.06.2023
Verlag
Springer US
Erschienen in
Fire Technology / Ausgabe 5/2023
Print ISSN: 0015-2684
Elektronische ISSN: 1572-8099
DOI
https://doi.org/10.1007/s10694-023-01441-4

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