Highly Insulating Glazing Systems using Non-Structural Center Glazing Layers
Three layer insulating glass units with two low-e coatings and an effective gas fill are known to be highly insulating, with center-of-glass U-factors as low as 0.57 W/m2-K (0.10 Btu/h-ft2-°F). Such units have historically been built with center layers of glass or plastic which extend all the way through the spacer system.
This paper shows that triple glazing systems with non-structural center layers which do not create a hermetic seal at the edge have the potential to be as thermally efficient as standard designs, while potentially removing some of the production and product integration issues that have discouraged the use of triples.
2008 Annual ASHRAE Meeting
Year of Publication
Building Technologies Department, Building Technology and Urban Systems Division, Windows and Envelope Materials
Building Façade Solutions, High-R Windows, Windows and Daylighting, W and D: High Performance Windows, BTUS Windows and Daylighting