01246nas a2200169 4500008004100000050001500041245006200056210006100118260002500179520069000204100001900894700002000913700002700933700002500960700002200985856006901007 2004 eng d aLBNL-5551700aDevelopment of Trade-Off Equations for EnergyStar Windows0 aDevelopment of TradeOff Equations for EnergyStar Windows aBoulder, COc08/20043 a
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.
1 aHuang, Yu, Joe1 aMitchell, Robin1 aSelkowitz, Stephen, E.1 aArasteh, Dariush, K.1 aClear, Robert, D. uhttps://facades.lbl.gov/publications/development-trade-equations