Use of Two Heat Flow Transducers for Transient Thermal Measurements on Porous Insulating Materials

    Published: Jan 1990

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    A method for measuring the apparent thermal conductivity of fibrous insulating materials under non-steady-state conditions is presented. The apparatus comprises one specimen and two heat flow transducers.

    Equations describing the variation of heat flow as a function of time and position are given. These equations are used to derive thermal transient properties from the heat flux measured on the cold and hot sides of the specimens.

    Finally, measurements on a variety of fibrous insulating materials are presented. These measurements show good agreement between the apparent thermal conductivities measured under transient and steady-state conditions. A significant reduction in test times compared to classic measurements with a single heat flow transducer apparatus was obtained.


    glass fibers, heat flow meter apparatus, heat flow transducer, heat transfer, thermal conductivity, thermal insulation, transient measurements

    Author Information:

    Langlais, C
    Isover Saint-Gobain, Centre De Recherches Industrielles de Rantigny, Rantigny,

    Boulant, J
    Isover Saint-Gobain, Centre De Recherches Industrielles de Rantigny, Rantigny,

    Paper ID: STP23326S

    Committee/Subcommittee: C16.30

    DOI: 10.1520/STP23326S

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