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Influence of moisture and moisture gradients on heat transfer through porous building materials

From National Research Council Canada

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Affiliation
  1. National Research Council of Canada
FormatText, Article
ConferenceSymposium, Thermal Transmission Measurements of Insulation, September 19, 1977, Philadelphia, Pennsylvania, United States
SubjectHygrothermal properties; thermal conductivity; thermal resistance; heat transfer; porosity; glass fibres; air moisture transfer; heat transmission; porous material; fibrous material; aerated concrete; moisture; moisture gradient; moisture effects; thermal conductivity probe; heat flowmeters
Abstract
The total heat transfer through moist, porous building materials is the sum of a number of heat-transfer phenomena. This paper presents experimental data on heat transfer through specimens of moist aerated concrete and mineral fiberboard. The aerated concrete specimens with known initial moisture distributions were exposed to a temperature gradient. This temperature gradient caused a redistribution of moisture which in turn changed the heat flow through the material. The changes were monitored by means of thermal probes, heat flowmeters, and thermocouples. The results of measurements were compared with calculations based on a simplified analytical model and with measurements made by other investigators. A second series of tests was made on a moist specimen of high-density mineral fiberboard to demonstrate the extent of the dependence of the total thermal resistance on the distribution of moisture in the material.
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  • ASTM Special Technical Publication (December 1978): 211–233.
LanguageEnglish
Peer reviewedYes
IdentifierDBR-P-819
NRC numberNRCC 17138
NRC-IRC-3017
NPARC number20375432
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Record identifierca849ef8-ef6f-4cba-86c1-269a8ca1fb08
Record created2012-07-23
Record modified2023-12-15
Date modified: