[EnergyPlus_Support] Re: Calculating effective SHGC

["Jean marais" <jeannieboef@xxxxxxxxx>]

The effective ratio of solar heat gain to total radiation falling on the assebly will change for every simulation time step, because the wind outside will change, the zone temperature and the surfaces temperatures and thus both convective and radiative and conductive heat transfer rates will change for each time step not to mention the angle and intensity of direct radiation and diffuse radiation.

You could easily calculate it on any one timestep, possibly even plot this ever changing number over the whole year (though that would probably need a bit of EMS reporting). 

The only question is, what are you hoping to learn from it? What is your end goal with this investigation?  


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Liam O'Brien" <liambrn@...> wrote:
>
> Hi all,
> 
> Does anyone have any insight on a good approach for calculating the effective SHGC of a window in E+. (I'm not asking for the rated SHGC, but rather what actually happens over a year). SHGC = transmittance + absorbed solar radiation that eventually convects and radiates inwards. 
> 
> The transmitted part is directly reported by E+, but the absorbed part that makes its way inward is not directly reported (because the net convection and radiation are provided; not just that caused by solar radiation). 
> 
> Your thoughts are welcome.
> 
> Thanks in advance!
> 
> Liam O'Brien
> Assistant Professor
> Carleton University 
> Ottawa, Canada
>




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