Incident wall heat flux distributions have been measured for square propane burner fire sources placed against the wall. Peak heat fluxes of 40-120 kw/m2 were measured for heat release rates of 50-500 kw/m2 and burner edge lengths of 0.28-0.7 m. Peak heat fluxes were found to be a strong function of heat release rate but were insensitive to flame aspect ratio or burner size. Correlations of the data were developed to represent the measured flux distributions. These correlations are intended for use in wall flame spread modeling. KEYWORDS: heat flux, wall fires, flame heat transfer Over the past decade, a great deal of work has been done in the area of flame spread on vertical and the role of wall covering materials in room fire development9-15. This work has been hampered by a lack of detailed characterization of flames exposing and igniting the wall material. Most commonly used wall materials cannot be casually ignited with small ignition sources. Rather, they require external heating from an adjacent fire such as a waste basket or furniture item.Most investigations of upward flame spread have used line burners as ignition sources. The heat flux distribution from such line burners has been characterized by ~a s e m i~ and has been shown to be very similar to heat flux distributions from wall flames themselves17. Peak heat fluxes in the 20-30 kw/m2 are typical. Thus, most of the work to date has focused on the problem of given an initial burning section will the flame
In view of current and future regulations on the emissions of Halon 1301 due to its contribution to stratospheric ozone depletion, alternatives to total flooding discharge tests with Halon 1301 are desirable. An important aspect of these tests is the determination of the leakage rate of the Halon 1301-air mixture from the enclosure.One method for estimating leakage is the door fan pressurization test. This test was evaluated on its ability to estimate both the total leakage area and the interface decay rate.This test procedure was found to be an adequate method to estimate the leakage rate from an enclosure, if a distribution of the leakage area over the compartment boundary can be assumed.Equations relating the leakage area to the interface descent or Halon 1301 concentration decay are derived for the stratified or well mixed case respectively. Typical simplifications of these equations (flow exponent, leakage area distribution, etc.) are also given.
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