Development of Trade-Off Equations for EnergyStar Windows
Publication Type
Conference Paper
Date Published
08/2004
Authors
Abstract
The authors explore the feasibility of adding a performance option to DOE's EnergyStar© Windows program whereby windows of differing U-factors and SHGCs can qualify so long as they have equivalent annual energy performance. An iterative simulation procedure is used to calculate trade-off equations giving the change in SHGC needed to compensate for a change in U-factor. Of the four EnergyStar© Window climate zones, trade-off equations are possible only in the Northern and Southern zones. In the North/Central and South/Central zones, equations are not possible either because of large intrazone climate variations or the current SHGC requirements are already near optimum.
Journal
SimBuild 2004
Year of Publication
2004
Organization
Building Technologies Department, Building Technology and Urban Systems Division, Windows and Envelope Materials
Research Areas
Building Façade Solutions, High-R Windows, Windows and Daylighting, W and D: High Performance Windows, BTUS Windows and Daylighting