%0 Conference Paper %B SimBuild 2004 %D 2004 %T Development of Trade-Off Equations for EnergyStar Windows %A Yu Joe Huang %A Robin Mitchell %A Stephen E. Selkowitz %A Dariush K. Arasteh %A Robert D. Clear %X

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.

%B SimBuild 2004 %C Boulder, CO %8 08/2004 %G eng %L LBNL-55517 %1

Windows and Daylighting Group

%2 LBNL-55517