Determining through numerical modeling the effective thermal resistance of a foundation wall system with low emissivity materials and furred - airspace

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TypeArticle
ConferenceICBEST 2010 - International Conference on Building Envelope Systems and Technologies: 27 June 2010, Vancouver, B.C.
Pages247257; # of pages: 11
SubjectHygrothermal modeling, hygIRC-C, basement wall system, convection and radiation heat transfer, low emissivity material, furred-airspace, effective thermal resistance of wall (RSI), R-valu; Walls
AbstractA numerical model was developed to investigate the effect of foil emissivity on the effective thermal resistance of a foundation wall system with foil bonded to expanded polystyrene foam in a furred assembly having airspace next to the foil. This model simultaneously solved the energy equation in the different material layers, surface-to-surface radiation equation in the furred ? airspace assembly, and the coupled compressible Navier-Stokes equation and energy equation in the airspace. A parametric study was then conducted to determine the effective thermal resistance (R-value) of the foundation wall system as a function of foil emissivity. Consideration was also given to a accumulation of dust and condensation on the foil surface as these may also affect the emissivity of the foil. The results showed that when the furring was installed horizontally a low foil emissivity of 0.05 can increase the wall R-value to as much as ~10%. In the next phase of this work, the present model will be benchmarked against test results and it will also be used to determine the effective thermal resistance of foundation wall systems when the furring is installed vertically. The outcome of these efforts will be reported at a later date.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number53574
21248
NPARC number20374504
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Record identifierdd06fc81-6412-45dc-9da9-6fafa3883c39
Record created2012-07-23
Record modified2016-05-09
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