TY - CONF T1 - Development of Trade-Off Equations for EnergyStar Windows T2 - SimBuild 2004 Y1 - 2004/08// A1 - Yu Joe Huang A1 - Robin Mitchell A1 - Stephen E. Selkowitz A1 - Dariush K. Arasteh A1 - Robert D. Clear AB - 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. JF - SimBuild 2004 CY - Boulder, CO U1 -

Windows and Daylighting Group

U2 - LBNL-55517 ER -