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RE: [EnergyPlus_Support] Re: Total SHGC for Window System





 

You can certainly get information about how the window is performing from those reports.  But SHGC concept also includes the inward flowing fraction of absorbed solar energy, so you would also want to monitor convection heat transfer from the window to the zone air -- for example, “Window Convection Heat Gain from Glazing to Zone” or “Surface Int Convection Heat Rate per Area” 

 

My understanding is that “SHGC”, as a rating metric,  is defined under a prescribed set of environmental conditions.  The widely varying sun angles and temperatures during a simulation don’t fit with that definition.  A time varying report for SHGC would be interesting but would also be confusing because of its use in product rating where  single-valued metric is expected.  

 

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Florian
Sent: Wednesday, August 04, 2010 8:30 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Total SHGC for Window System

 

 

Would it be correct if I add the Report Variables

- Window System Solar Transmittance
- Window System Solar Absorptance

to get the total SHGC during the Simulation?

BR,
Florian

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "hongtz68" <thong@...> wrote:
>
>
> EnergyPlus currently only reports the SHGC for the glazing part. The code is not actually using the SHGC. It is for reporting purpose only.
>
> You may be able to calculate that using other available report variables.
>
>
> Tianzhen
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Florian" <florian.stift@> wrote:
> >
> > Greetings,
> >
> > Which Output Variables describe the Total Solar Heat Gain Coefficient of a Window System, including shading devices if present?
> >
> >
> > BR,
> > Florian
> >
>



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