Effect of thickness on the thermal properties of thick specimens of low-density thermal insulation

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TypeArticle
ConferenceSymposium on Thermal Insulation Performance: 21 August 1978, Tampa, FL, USA
ISSN0066-0558
Pages3650; # of pages: 15
Subjectthermal insulation; thermal properties; thickness; density (physics); thermal resistance; thermal conductivity; plate emittance; boundary emittance; Insulation; isolation thermique; propriete thermique; epaisseur; masse volumique
AbstractA three-layer model comprising two surface layers and a core is developed to explain the effect of specimen thickness on the thermal properties of thick insulation. The model explains the effect of boundary emittance and specimen density on the measurements. A relationship between the apparent thermal resistivity and the increase in resistance per unit thickness is derived. Equations are given for the densities at which the maximum thermal resistance of the core of the specimen and whole specimen occurs and for the variation of thermal conductivities of the core and the specimen with the ratio of density to density at which the minimum conductivity occurs. The densities at which the extremes occur are almost independent of specimen thickness. A V-shape and not the customary nonsymmetrical U- shape is suggested for the variation of thermal conductivity. Equations for use in curve fitting that introduce curvature at the apex and shift the position of the minimum are suggested.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-966
NRC number19273
1817
NPARC number20377135
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Record identifier8fb99ae9-33f4-45e8-b44c-64f252dca371
Record created2012-07-24
Record modified2016-05-09
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