STP789: Influence of Moisture on Heat Transfer Through Fibrous-Insulating Materials

    Langlais, C
    Isover Saint-Gobain, Centre de Recherches Industrielles, Fantigny,

    Hyrien, M
    Isover Saint-Gobain, Centre de Recherches Industrielles, Fantigny,

    Klarsfeld, S
    Isover Saint-Gobain, Centre de Recherches Industrielles, Fantigny,

    Pages: 19    Published: Jan 1983


    Abstract

    In a previous study, the thermal conductivity of a high-density mineral fiberboard had been experimentally determined as a function of moisture content at ambient temperature in steady-state conditions, allowing moisture to be redistributed in the product. The results obtained were significantly different from those of other authors who had performed experiments with a uniform moisture distribution. The present work is an attempt to understand the reasons for these differences. A second series of tests has been performed on the same high-density product in an attempt to re-create the results of these authors. A method of measurement has been developed, and the results obtained for mean temperatures of 10 and 24°C are presented and discussed. Special attention is given to the heat transfer caused by vapor diffusion and to the latent heat component of thermal conductivity due to this diffusion. A simple model for predicting the thermal conductivity in the conditions of the tests is presented; fairly good correlation with the experimental results was obtained. Finally, all results are compared and discussed in order to see which can be considered representative of field conditions.

    Keywords:

    thermal insulation, thermal conductivity, heat transfer, moisture migration, fibrous material


    Paper ID: STP29472S

    Committee/Subcommittee: C16.30

    DOI: 10.1520/STP29472S


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