Effect of furring orientation on thermal response of wall systems with low emissivity material and furred-airspace

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Proceedings titleBEST 3 2012: The Building Enclosure Science and Technoloogy Conference Proceedings
ConferenceBuilding Enclosure Council Science and Technology 3 (BEST 3) Conference: High Performance Building - Combining Field Experience and Innovation, April 2-4, 2012, Atlanta, GA.
Pages115; # of pages: 15
SubjectReflective insulation; Furred-Airspace Assembly (FAA); low emissivity material; thermal modelling; thermal resistance; R-value; airflow; heat transfer by convection; conduction and radiation
AbstractIn wall systems, airspaces can contribute in obtaining a higher thermal resistance, if a reflective material such as foil with low emissivity is installed on one side or the other of a Furred-Airspace Assembly. In this paper, the present model, hygIRC-C, was used to investigate the steady-state thermal performance of wall specimens that incorporate foil bonded to expanded polystyrene (EPS) foam in a furred-assembly having airspace next to the foil. In order to investigate the effect of the furring orientation on the wall thermal performance, the furring was installed horizontally and/or vertically. Also, a reference wall similar to these walls but with no furring was considered. For the reference wall and wall with horizontal furring, the 2D version of the present model is suitable to model these wall assemblies. However, for wall with vertical furring, the 3D version of the present model was used in order to capture the 3D effect of the thermal bridges due to the vertical furring on the energy transport and momentum transport in the wall system. Consideration was given to investigate the effect the foil emissivity and outdoor temperature on the contribution of the FAA on the thermal performance of the wall systems. Results showed that the thermal resistance (R-value) of the reference wall (no furring) is greater than the wall systems with furring. Also, results showed that the contribution of the FAA to the R-value of wall system with vertical furring is higher than that for wall system with horizontal furring.
Publication date
AffiliationConstruction; National Research Council Canada
Peer reviewedYes
NRC number55283
NPARC number21239622
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Record identifier770dfd34-2e8d-435a-950f-286457ff9210
Record created2013-02-14
Record modified2016-05-09
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