[EnergyPlus_Support] Re: Window wall ratio

["Ooi" <ooi_kb3@xxxxxxxxxxx>]

Just wondering the purpose of the original question. 

According to the Engineering Documentation, the EnergyPlus shadow algorithm computes the sunlit areas to determine the effect of shadows on the heat transfer through the walls, when the FullExterior or FullInteriorAndExterior Solar Distribution is used.  

The ShadowCalculation frequency can be shortened from the default of 20 days if better accuracy is needed.

ooi

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Dru Crawley <dbcrawley@...> wrote:
>
> EnergyPlus requires that windows are part of a wall system (window must be
> slightly smaller than the wall).  Suggest that you model the wall as
> spandrel (20%) and the rest as your curtain wall.
> 
> On Fri, Nov 4, 2011 at 9:07 AM, Vinay Devanathan <vinay.devanathan@...
> > wrote:
> 
> > **
> >
> >
> > Hello all,
> >
> > Assuming there is a building with curtain walls throughout. And the
> > performance parametrrs of the whole curtainwall system is known. Would it
> > be alright to have all of the exterior as glazed and use the parametrs of
> > the wholr system in the glass in the case where daylighting is not a
> > concern. Or lets say there is 20% spandrel and rest glazed, should we model
> > onlu the 80% as window and leave the remaining 20% as external wall amd use
> > the spandrels thermal properties? In case spandrel is okay to be combined
> > within the overall system and respresented as a window for modeling. Should
> > the respective baseline have 100% window wall ratio or only 80%.
> >
> > Thanks in advance!
> >
> > Vinay
> >
> >  
> >
>




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