Re: [EnergyPlus_Support] Window reveals help

[Rob Hitchcock <RJHitchcock@xxxxxxx>]

Troy,

Yes, this is confusing.

Surfaces and SubSurfaces in EnergyPlus have no thickness in and of 
themselves.  It is only when the vertex coordinates for a Window 
SubSurface place it in a different plane from its host Wall Surface, 
presumably some distance from the "inside" face of the Wall Surface 
plane, that an outside reveal is detected by EnergyPlus.

Inside reveal depths and absorptances (for sill and other edges) are 
input using the WindowFrameAndDivider input object.

Regarding the impact of these reveals on solar gains, read the details 
in the Input/Output Reference under WindowFrameAndDivider/Reveal Surface 
Fields, in particular the following:  "The net effect of beam solar 
reflected from outside reveal surfaces is to increase the heat gain to 
the zone, whereas the effect of beam solar reflected from inside reveal 
surfaces is to decrease the heat gain to the zone since part of this 
reflected solar is transmitted back out the window."

Hope this helps.

Rob Hitchcock
========
taharvey2001 wrote:

> I've read through all the documentation on window reveals, and I'm
> still confused. According to the documentation, the window reveals are
> spec'd from the inside reveal edge->glass, and energy plus figures out
> the Glass->outside reveal. In otherwords the input specifies the glass
> distance from the inner wall surface, and E+ calcs the glass distance
> from the outer wall surface.
>
> However, as far as I know E+ knows nothing about wall thickness (1-D
> calculations), so on what basis does it calculate the window to outer
> wall surface.
>
> So does that mean the default setting of '0' places the window on the
> inside wall surface (full depth reveal), instead of the US
> architectural norm of the outside wall surface?
>
> Also, I'm baffled that E+ takes the inner reveal as the augment, as
> the inner reveal has no impact on shading (and thus solar gain...
> although it does impact daylight diffusion), whereas the exterior
> reveal does.
>
> In a previous post, it was stated that reveals should show up as
> window->wall off-sets in the DXF output. But I see none in mine, they
> completely coplaner.
>
> thanks,
> Troy
>
>
>  





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