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NC-2009 EAp2:Minimum Energy Performance

Opaque panels

Similarly to the situation of this picture http://www.waymarking.com/gallery/image.aspx?f=1&guid=89c50354-3bc4-459b-a423-3b962523167c in the windows that I’m modelling there is a transparent part and an opaque panel. The opaque panel is metallic, like the frame. For the baseline model I considered the whole window surface as transparent (even the part that is opaque in the real building) and I imposed a total SHGC factor equal to 0.40 (according to table 5.5-4). Could this approach be acceptable? Or should I consider the opaque panel in another way? Regards

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 11/06/2013 - 15:36

The opaque panel and frame are not windows, they are treated as walls. See the definition of "walls" in the standard.

Wed, 11/06/2013 - 15:57

So shall the geometry of the windows in the baseline model correspond only to the glazed parts, without the frame? I thought that the frame is considered as part of the window. In fact, in Table 5.5 below "vertical glazing" the kind of frame is specified (nonmetal, metal...). Thank you.
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 11/06/2013 - 16:36

No the windows include the frames for modeling purposes. See the definition of "fenestration".

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