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Thermal performance of wall assemblies with low emissivity

Par Conseil national de recherches du Canada

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DOITrouver le DOI : https://doi.org/10.1177/1744259112450419
AuteurRechercher : 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
In wall systems, airspaces can increase thermal resistance if a reflective material such as foil with low emissivity is installed in a Furred-Airspace Assembly (FAA). In this paper, the present model, hygIRC-C, was used to investigate the steady-state thermal resistance of wall assemblies that incorporate foil adhered to expanded polystyrene (EPS) foam in a furred-assembly. To investigate the effect of the furring orientation, the furring was installed horizontally and vertically and compared to walls with no furring. For wall with vertical furring, the 3D version of the present model was used to capture the 3D effect of the thermal bridges. Because the foil emissivity can be affected by dust accumulation and/or water vapor condensation on the foil surface, consideration was given to investigate the effect of both varying foil emissivity and outdoor temperature on the thermal performance of the various wall specimens. Results showed that the thermal resistance (R-value) of the reference wall (no furring) is greater than the wall specimens with furring. Also, results showed that the contribution of the FAA to the R-value of wall specimen with vertical furring is higher than that for wall specimen with horizontal furring.
Date de publication
Dans
  • Journal of Building Physics 36, nº 3 (23 décembre 2012) : 308–329.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCNRCC 55278
NRC-IRC-22289
Numéro NPARC21240091
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Identificateur de l’enregistrement932a7ce2-88ef-4d2a-9e53-365e7be5cd41
Enregistrement créé2013-02-15
Enregistrement modifié2020-04-21
Date de modification :