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

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TypeArticle
Proceedings titleASTM Special Technical Publication
ConferenceThermal Transmission Measurements of Insulation : Symposium: 19 September 1977, Philadelphia, PA, USA
ISSN0066-0558
Volume660
Pages21133; # of pages: 179
Subjectthermal conductivity; thermal resistance; heat transfer; porosity; glass fibres; air moisture transfer; thermal conductivity; thermal resistance; heat transfer; heat transmission; porous material; fibrous material; glass fiber; aerated concrete; moisture; moisture gradient; moisture effects; thermal conductivity probe; heat flowmeters; Hygrothermal properties; conductivite thermique; resistance a la chaleur; transfert de chaleur; porosite; fibre de verre; transfert de l'humidite de l'air
AbstractThe 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.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-819
NRC number17138
3017
NPARC number20375432
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Record identifierca849ef8-ef6f-4cba-86c1-269a8ca1fb08
Record created2012-07-23
Record modified2016-05-09
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