A method for determining the thermal resistances of experimental flat roof systems using heat flow meters

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TypeArticle
ConferenceSymposium on Thermal Insulation Performance: 22 October 1978, Tampa, FL, USA
ISSN0066-0558
Pages307321; # of pages: 15
SubjectRoofing; flat roofs; thermal resistance; thermal insulation; heat transfer; heat meters; heat flow meters; thermal insulation; thermal resistance; flat roofs; buildings; Heat performance; Couvertures; toiture terrasse; resistance a la chaleur; isolation thermique; transfert de chaleur; compteur de chaleur
AbstractExperimental flat roof systems were studied at an outdoor test facility. Heat flow rates and temperatures were measured with heat flow meters and thermocouples, and the values were recorded on magnetic tape at fixed intervals. The results were averaged over 24-h periods. Thermal resistances of systems and individual components were found using average net heat flow rates and temperature differences. Two analytical methods were used. In the first, the ratio of heat flow to temperature difference was calculated. This method was unreliable at low heat rates due to a bias in the results. In the second method, the slope of heat flow versus temperature difference was used as the basis for calculation. Thermal resistances of several pieces of insulation found by this method were compared with results obtained using laboratory equipment. The differences ranged from about 0.5 to 5 percent.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-967
NRC number19274
1505
NPARC number20378915
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Record identifier18bde7f3-6430-41d2-98c0-d87030f336cf
Record created2012-07-24
Record modified2016-05-09
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