Yes that is what I am saying. In addition to conduction it
is included in radiation, convection, and optical calculations.
From:
EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On
Behalf Of aymericnovel
Sent: Thursday, July 29, 2010 7:36 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Insulation of external solar shading
So you would say that this new
"layer" is included in the conduction calculation of the assembly?
If yes then thanks a million!
Aymeric
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx,
"Griffith, Brent" <brent.griffith@...> wrote:
>
> 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@...]
> Sent: Wednesday, July 28, 2010 9:27 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Insulation of external solar shading
>
> Hi,
>
> 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!
> Aymeric
>
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