Thermal performance of wall assemblies with low emissivity

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Journal titleJournal of Building Physics
Pages308329; # of pages: 22
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
AbstractIn 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.
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AffiliationConstruction; National Research Council Canada
Peer reviewedYes
NRC number55278
NPARC number21240091
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Record identifier932a7ce2-88ef-4d2a-9e53-365e7be5cd41
Record created2013-02-15
Record modified2016-05-09
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