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Numerical modeling and experimental investigations of thermal performance of reflective insulations

Par Conseil national de recherches du Canada

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DOITrouver le DOI : https://doi.org/10.1177/1744259112444021
AuteurRechercher : 1; Rechercher : 1; Rechercher : 1; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada. Construction
FormatTexte, Article
SujetReflective 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
Résumé
Reflective 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
Date de publication
Dans
  • Journal of Building Physics 36, nº 2 (22 octobre 2012) : 163–177.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCNRCC 54538
NRC-IRC-21936
Numéro NPARC21239624
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Identificateur de l’enregistrement74cb81ef-cf82-43ba-ae04-bb4ba9e2dde1
Enregistrement créé2013-02-14
Enregistrement modifié2020-04-21
Date de modification :