SYMPOSIA PAPER Published: 01 January 1983
STP29472S

Influence of Moisture on Heat Transfer Through Fibrous-Insulating Materials

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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.

Author Information

Langlais, C
Isover Saint-Gobain, Centre de Recherches Industrielles, Fantigny, France
Hyrien, M
Isover Saint-Gobain, Centre de Recherches Industrielles, Fantigny, France
Klarsfeld, S
Isover Saint-Gobain, Centre de Recherches Industrielles, Fantigny, France
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Details
Developed by Committee: C16
Pages: 563–581
DOI: 10.1520/STP29472S
ISBN-EB: 978-0-8031-4856-7
ISBN-13: 978-0-8031-0230-9