STP789

    Flanking Loss Calibration for a Calibrated Hot Box

    Published: Jan 1983


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    Abstract

    Calibrated hot boxes are used to measure heat flow through building envelope components such as walls. To determine the specimen heat flow, the energy input to the metering chamber must be corrected for extraneous losses. Originally, these extraneous losses were assumed to occur only through the chamber walls. Recent events in the technical community have demonstrated that significant heat flow also occurs between the metering chamber and the climatic chamber through the specimen frame. This heat flow is called flanking loss. Hot box calibrations must account for flanking loss in addition to chamber wall loss in order to achieve highly accurate results.

    This paper describes the flanking loss calibration for an existing calibrated hot box. A flanking loss model was developed, then tests were run on specimens of known thermal conductivity. For these tests, the specimen heat flow was determined based on the known conductivity and measured temperatures. The flanking loss was then found from an energy balance on the metering chamber. Finally, these data were used to upgrade the flanking loss model. The result was an empirical equation relating flanking loss to the temperature difference between the two chambers, the associated mean temperature, and the specimen thickness.

    Keywords:

    calibrated hot box, calibrating, flanking loss, thermal measurements, thermal resistance, walls


    Author Information:

    Lavine, AG
    Research and Development Division, Owens-Corning Fiberglas Corporation, Technical Center, Granville, Ohio

    Rucker, JL
    Research and Development Division, Owens-Corning Fiberglas Corporation, Technical Center, Granville, Ohio

    Wilkes, KE
    Research and Development Division, Owens-Corning Fiberglas Corporation, Technical Center, Granville, Ohio


    Paper ID: STP29449S

    Committee/Subcommittee: C16.30

    DOI: 10.1520/STP29449S


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