Development of Trade-Off Equations for EnergyStar Windows

Publication Type

Conference Paper

Date Published

08/2004

LBNL 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