Experimental procedure and uncertainty analysis of a guarded hot box method to determine the thermal transmission coefficient of skylights and sloped glazing

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ConferenceASHRAE Transactions: 01 January 2000, Dallas, TX., U.S.A.
Issuept. 2
Pages601613; # of pages: 13
SubjectSkylights; Heat performance
AbstractA laboratory test procedure and a guarded hot box facility used to determine the thermal transmission coefficient of skylights are described. Skylights can be tested at an angle of inclination that can be varied from 20 degrees to 90 degrees off the horizontal. The experimental procedure, to determine the skylight R-value, is based on a correlation for the convective heat transfer on the warm side and the weather side of the test specimen. This correlation is obtained from calibration measurements using a calibrated transfer standard (CTS) in the inclined position. The results show that the convective heat transfer along an inclined CTS is substantially different from that along a vertical CTS. Three-dimensional simulations of the conductive heat transfer within the CTS assembly are found to be in good agreement with the experimental results. A complete uncertainty analysis for the calibration experiments and for skylight testing is presented. It is found that the experimental relative uncertainty associated with the thermal transmission coefficient of the test specimen without the frame is of the order of 6%.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number43378
NPARC number20331339
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Record identifier66d7b11c-46f5-4c85-bcea-25a233a69c15
Record created2012-07-18
Record modified2016-05-09
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