Development of Trade-Off Equations for EnergyStar Windows

Date Published
08/2004
Publication Type
Conference Paper
Authors
LBL Report Number
LBNL-55517
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.

Conference Name
SimBuild 2004
Year of Publication
2004
Conference Location
Boulder, CO
Call Number
LBNL-55517
Custom 1
<p>Windows and Daylighting Group</p>
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