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RE: [EnergyPlus_Support] Insulation of external solar shading

Assuming you are talking about windows and attached window shades (as opposed to shading overhangs or fins) -- I have a different opinion and would say that it is taken into account.   Exterior window shades, described by WindowMaterial:Shade, are included in the Construction assembly that is applied to the fenestration when the shade is deployed.  The shade becomes a full fledged glazing layer in the detailed layer-by-layer modeling of glazing systems (based on WINDOW5 and ISO15099) and is completely modeled in terms of its optical and thermal impacts. 
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of aymericnovel [aymericnovel@xxxxxxxxx]
Sent: Wednesday, July 28, 2010 9:27 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Insulation of external solar shading


One of my colleague asked me if E+ takes into account the added insulation of a closed external solar shading (at night in winter especially). Indeed, the french energy efficiency standard defines a Ujn (namely U factor day and night), mainly to take into account that when you close the solar shading and that it creates an enclosed space between it and the window, the overall U value is somewhat a bit lower.

Although I personnally think the effect is small, it made me curious. It seems the object AdvancedSurface:MovableInsulation doesn't fit this use. And I didn't find any thermal balance equation related to external solar shadings in the engineering reference. So, so far, it seems to me this particular parameter is not taken into account in the software.

Has someone a different opinion?

Thanks a million for your advises!


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