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Proceedings Paper

Buildings research using infrared imaging radiometers with laboratory thermal chambers
Author(s): Brent T. Griffith; Dariush Arasteh
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Paper Abstract

Infrared thermal imagers are used at Lawrence Berkeley National Laboratory to study heat transfer through components of building thermal envelopes. Two thermal chambers maintain steady-state heat flow through test specimens under environmental conditions for winter heating design. Infrared thermography is used to map surface temperatures on the specimens' warm side. Features of the quantitative thermography process include use of external reference emitters, complex background corrections, and spatial location markers. Typical uncertainties in the data are plus or minus 0.5 degrees Celsius and 3 mm. Temperature controlled and directly measured external reference emitters are used to correct data from each thermal image. Complex background corrections use arrays of values for background thermal radiation in calculating temperatures of self-viewing surfaces. Temperature results are used to validate computer programs that predict heat flow including Finite-Element Analysis (FEA) conduction simulations and conjugate Computational Fluid Dynamics (CFD) simulations. Results are also used to study natural convection surface heat transfer. Example data show the distribution of temperatures down the center lines of an insulated window.

Paper Details

Date Published: 19 March 1999
PDF: 12 pages
Proc. SPIE 3700, Thermosense XXI, (19 March 1999);
Show Author Affiliations
Brent T. Griffith, Lawrence Berkeley National Lab. (United States)
Dariush Arasteh, Lawrence Berkeley National Lab. (United States)

Published in SPIE Proceedings Vol. 3700:
Thermosense XXI
Dennis H. LeMieux; John R. Snell Jr., Editor(s)

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