Pre-flashover compartment fire temperature: a new calculation model validated with experiments
(English)In: Fire safety journal, ISSN 0379-7112, E-ISSN 1873-7226Article in journal (Refereed) Submitted
A new two-zone model for computing temperature of pre-flashover compartment fires is introduced. This model predicts upper layer fire temperatures in compartments with semi-infinitely thick boundaries as well as with boundaries of insulated or non-insulated steel sheets. The mass flows of air and fire gases are assumed controlled by the plume entrainment depending on a prescribed heat release rate and plume height. The combustion is limited by the rate at which gaseous fuel (pyrolysis gases) is released. The model is based on the assumption that the heat release rate is equal to the heat lost by convection of air and radiation out through the opening(s) and by losses to the surrounding structures.
For a constant heat release rate, this model yields the maximum upper layer temperature a fire would reach when lasting for a very long time as well as the fire temperature as a function of time depending on the inertia, on the design of the surrounding structure and on the ventilation conditions of the compartment.
This model is validated by comparisons with very accurately defined and controlled experiments.
two-zone fire model, flashover, compartment fire temperature, model validation
Other Engineering and Technologies
IdentifiersURN: urn:nbn:se:ltu:diva-62019OAI: oai:DiVA.org:ltu-62019DiVA: diva2:1074460