3D thermal model for predicting the thermal resistance of spray polyurethane foam wall assemblies

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ConferenceEleventh International Conference on Thermal Performance of the Exterior Envelopes of Whole Buildings XI: 05 December 2010, Clearwater, (FL), USA
Pages119; # of pages: 19
SubjectInsulation, laboratory testing, thermal response, 3D modeling, foam insulation, thermal resistance; Building envelope
AbstractA Wall Energy Rating (WER) system has been proposed to account for simultaneous thermalconduction and air leakage heat losses through a full-scale wall system. Determining the overall WERrequires that two standard tests be performed on a full-scale wall specimen: a thermal resistance testand an air leakage test. A 3D model representation of the wall specimen is developed to combine theresults of these tests to obtain an accurate prediction of the wall thermal resistance (apparent R-value)under the influence of air leakage. Two types of wall configurations were simulated. The first one wasa standard 2? by 6? wood stud frame construction, made of spruce, spaced at 16? (406 mm) o/c in 2.4m x 2.4 m full-scale wall specimens. The second type of wall configuration was similar to the first oneexcept that it included through-wall penetrations (a window opening, a pipe, an electric box and a duct),according to the Canadian Construction Material Centre (CCMC) Air Barrier Guide 07272 (1996).The cavities of the two types of wall configurations were filled with different types of insulations (i.e.Open Cell Spray Polyurethane foams). Results showed that the present model predicted the R-values ofall walls to within +5%. After gaining confidence in the model predictions, it was used to determine theapparent R-values for these walls at different air leakage rates.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number53582
NPARC number20373868
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Record identifier9791797c-8d82-4681-9dfd-c4bc13420ee2
Record created2012-07-23
Record modified2016-05-09
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