Heat Flux Measurements and Their Uncertainty in a Large-Scale Fire Test

    Volume 39, Issue 6 (November 2011)

    ISSN: 0090-3973


    Published Online: 1 August 2011

    Page Count: 11

    Lam, Cecilia S.
    CanmetENERGY, Natural Resources Canada,

    Weckman, Elizabeth J.
    Univ. of Waterloo,

    (Received 16 April 2011; accepted 11 July 2011)


    Heat flux data from a series of controlled experiments involving a 2 m diameter, wind-blown pool fire are examined to highlight the difficulties involved in conducting heat flux measurements in a realistic, large-scale, hydrocarbon-fueled fire. Data were taken at several locations along the ground near the fire. At each location, three different heat flux sensors were positioned together: a Gardon gage, a directional flame thermometer (DFT) and a Sandia heat flux gage (HFG). Methods were first developed to correct measured values of heat flux for the slight differences in gage location relative to the fire. The remaining discrepancies between the values of heat flux measured by the different gages were then used to highlight uncertainties in heat flux measurements due to differences in gage surface temperature, in gage thermal response to the inherent modes of heating involved in the large hydrocarbon fire environment, and in conduction losses from the gage sensor plates. The importance of these sources of discrepancy varied depending on the magnitude of the measured heat flux and on whether the gages were located in a radiation-dominated or mixed radiative-convective environment within the fire.

    Paper ID: JTE103922

    DOI: 10.1520/JTE103922

    ASTM International is a member of CrossRef.

    Title Heat Flux Measurements and Their Uncertainty in a Large-Scale Fire Test
    Symposium Uncertainty in Fire Standards and What to Do about It, 2011-06-15
    Committee E05