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A Calorimeter for determining heat transmission characteristics of windows

From National Research Council Canada

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Affiliation
  1. National Research Council of Canada. NRC Institute for Research in Construction
SponsorSearch for: ASTM Committee C-16 on Thermal Insulation
FormatText, Article
ConferenceThermal insulation: materials and systems: 02 December 1984, Dallas, Texas, USA
Subjectwindows; thermal insulation; heat transfer; calorimeters; windows; thermal performance; laboratory measurement; conductance; guarded hot boxes; calorimeters; thermal insulation; heat loss; environmental test facility; calibration tests; Heat performance; fenêtre; isolation thermique; transfert de chaleur; calorimètre
Abstract
Heat loss through windows is receiving an increasing amount of attention from consumers, manufacturers, and building designers. The technology is changing and should lead to substantial improvements in thermal performance. To assist in the evaluation of existing as well as new products, the Division of Building Research, National Research Council of Canada , has designed and built a new calorimeter for use in their Environmental Test Facility. This paper presents an approach for determining the heat transmission characteristics of windows using the radiative and convective components of heat transfer from the calorimeter to the specimen surface. Through calibration tests using materials of known conductance, expressions for the radiation exchange between the calorimeter surfaces and the specimen and the calorimeter air to the specimen can be determined. These expressions are then used when testing a window to calculate an equivalent surface temperature for the window. This approach is necessary because of the difficulty in determining an average surface temperature on glass. Although the approach can be used with conventional calorimeter designs, uncertainties are introduced because of the changing calorimeter characteristics for different sizes of specimens. To reduce the uncertainties, the new calorimeter was designed to have a constant convection coefficient and uniform temperature radiation field. The calibration program is discussed, and some preliminary results are given.
Publication date
In
  • ASTM Special Technical Publication 922 (1987): 567–581.
LanguageEnglish
Peer reviewedYes
IdentifierIRC-P-1544
NRC numberNRCC 29068
NRC-IRC-1261
NPARC number20386377
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Record identifier62444b73-412b-4ddd-a50d-03420f241a7b
Record created2012-07-25
Record modified2020-06-06
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