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Temperature Profiles In Forced-Ventilation Enclosure Fires

Backovsky, J., Foote, K.L. and Alvares, N.J., 1989. Temperature Profiles In Forced-Ventilation Enclosure Fires. Fire Safety Science 2: 315-324. doi:10.3801/IAFSS.FSS.2-315


We investigated the effect of ventilation rate, ventilation configuration, fire elevation, and the presence of a plenum (suspended ceiling) on the fire compartment temperatures during forced ventilated methane gas fires (100-400 kW). We found that with low air-inlet positions, fires with ventilation rates greater than 2 - 3 times the stoichiometrically required air (referred to here as well-ventilated fires) produce two layer temperature profiles; fires with a lower ventilation rate (under ventilated fires) produce single-layer profiles with a temperature gradient. Higher temperatures throughout the enclosure are seen in under ventilated fires as compared to well-ventilated fires. We observed that high air-inlet locations perturb the two-layer temperature profile of the well-ventilated fire, cooling the upper layer and heating the lower layer. For under ventilated fires, high air-inlet locations lower temperatures in the enclosure but do not perturb the profile shape. Elevated fires and fires in a compartment with a plenum were seen to behave similarly for the same distance from fire base to ceiling, producing hotter layers the shorter the distance.


Compartment fires: force-ventilated, Plenum, Temperature profiles, Test methods: small-scale, Ventilation factors

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