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The difference is largely in the angular dependent spectral properties (i.e., for non-normal solar angles). I don't know if this impact has been quantified anywhere.

There is work done in EnergyPlus to remedy this problem, but that too has it's short comings.

You use the same methodology to build up a similar "Simple Glazing" system in BDL. I don't know if the objects are directly accessible from the eQuest interface. I implemented this in BEopt (when it still interfaced to DOE-2). You can potentially use an older version of BEopt to generate the BDL for windows given only a U-factor and SHGC.

The difference is largely in the angular dependent spectral properties (i.e., for non-normal solar angles). I don't know if this impact has been quantified anywhere. There is some discussion in this paper from LBNL.

There is work done in EnergyPlus to remedy this problem, but that too has it's short comings.

You use the same methodology to build up a similar "Simple Glazing" system in BDL. I don't know if the objects are directly accessible from the eQuest interface. I implemented this in BEopt (when it still interfaced to DOE-2). You can potentially use an older version of BEopt to generate the BDL for windows given only a U-factor and SHGC.

The difference is largely in the angular dependent spectral properties (i.e., for non-normal solar angles). I don't know if this impact has been quantified anywhere. There is some discussion in this paper from LBNL.

There is work done in EnergyPlus to remedy this problem, but that too has it's short comingsits shortcomings.

You use the same methodology to build up a similar "Simple Glazing" system in BDL. I don't know if the objects are directly accessible from the eQuest interface. I implemented this in BEopt (when it still interfaced to DOE-2). You can potentially use an older version of BEopt to generate the BDL for windows given only a U-factor and SHGC.