Unique thermal problem found in certain double-glazed windows

Robert W. Spring; John R. Snell Jr.

doi:10.1117/12.459575

15 March 2002 Unique thermal problem found in certain double-glazed windows

Robert W. Spring, John R. Snell Jr.

Proceedings Volume 4710, Thermosense XXIV; (2002) https://doi.org/10.1117/12.459575
Event: AeroSense 2002, 2002, Orlando, FL, United States

Abstract

Thermography has been used with great success for number of years to inspect building fenestration, both during design and production, as well as after installation.1 Typically double-glazed windows exhibit a well-understood pattern of increased heat loss around the perimeter, due mainly to thermal bridging or edge-effect losses. In this paper we present the findings of an investigation about a very different, and unusual, thermal pattern discovered on windows in the home of one of the authors. The pattern was first illuminated by condensation in the central portion of the window. This thermal pattern was verified with a radiometric thermal imaging camera as well as thermal contact probes. After additional investigation we found the cause of this anomalous pattern is related to the loss of some of the insulating argon gas installed in the window during manufacturing. We also discovered the problem was a not uncommon for certain types of windows. As these windows age, the problems usually become more pronounced and, in some cases, a total failure of the window by implosion results. We hope that publication of this information will rove useful to others who may have been mystified after seeing similar patterns.

Citation Download Citation

Robert W. Spring and John R. Snell Jr. "Unique thermal problem found in certain double-glazed windows", Proc. SPIE 4710, Thermosense XXIV, (15 March 2002); https://doi.org/10.1117/12.459575

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