Numerical modeling and experimental investigations of thermal performance of reflective insulations

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DOIResolve DOI: http://doi.org/10.1177/1744259112444021
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TypeArticle
Journal titleJournal of Building Physics
ISSN1744-2591
1744-2583
Volume36
Issue2
Pages163177; # of pages: 15
SubjectReflective insulation; furred-airspace assembly; low emissivity material; thermal modelling; thermal resistance test method; R-value; heat flow meter; ASTM C-518; ASTM C-1363; airflow; heat transfer by convection; conduction and radiation
AbstractReflective insulations are being used in attics, flat roof, and wall systems. Numerical modeling and experimental investigations were conducted to assess the thermal performance of assemblies with reflective insulations. In this article, the present model was used to verify the use of the ASTM C-518 test method for measuring the effective thermal resistances (R-values) of sample stacks comprising reflective insulations. Two tests were conducted on sample stacks using heat flow meter apparatus. The sample stack consists of two expanded polystyrene layers and a reflective insulation installed in between. The model predictions agreed with the measured heat fluxes within ±1%. The article also discusses the combined effect of heat transfer by convection and radiation in the airspace facing the reflective insulation, showing that the derived R-value from the test data resulted in underestimation of the effective R-value of the sample stack
Publication date
LanguageEnglish
AffiliationConstruction; National Research Council Canada
Peer reviewedYes
NRC number54538
21936
NPARC number21239624
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Record identifier74cb81ef-cf82-43ba-ae04-bb4ba9e2dde1
Record created2013-02-14
Record modified2016-05-09
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