[EnergyPlus_Support] Re: Shading Related Questions

["petervipac" <peterh@xxxxxxxxxxxx>]

Hello Linda,

Thanks a lot for your quick response, I really appreciate that.  I am 
trying simulate the shading effect of a 3D awning which resembles the 
old Latin sails on ships.  Like this triangular sail in the picture 
http://en.wikipedia.org/wiki/Sail

I could try to represent the sails using 2 big triangles initially.  
But I'm thinking about modelling the sails by joining many smaller 
pieces of geometries to better represent the 3D structure.  That's 
why I'm wondering if there's a limit of how small those pieces can 
be?  Or is there a better way to tackle this problem?

Question regarding the "resolution" - IF we can see the shadows 
casted by the shading device (simulated by EP), will the shadows have 
smooth edges or rough zig-zag edges?  I know this is a weird question 
but I'm just wondering how shading is simulated by EP in addition to 
the information mentioned in the Engineering Reference.

My appologies for not making the questions clear the first time.  I'm 
looking forward to your answers.  Thank you for your help and 
patience!

Regards,
Peter Huang

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@...> 
wrote:
>
> At 09:04 PM 11/4/2007, petervipac wrote:
> 
> >1. Does EP handle tilted/polygon shading devices (eg a 
sail/awning)?
> 
> Yes.
> 
> 
> >2. What is the smallest geometrical entity which EP can handle for
> >shading calculation?
> 
> There is no program imposed limit.  There is likely a common sense 
> limit and what you are trying to achieve limit.
> 
> 
> >3. This is related to question 2: What is the "resolution" of EP's
> >shading calculation?  I noticed that EP doesn't give the user any 
sort
> >of "mesh" control.  Does that mean it's up to the user to refine
> >the "mesh" (geometry) themselves?
> 
> I'm not sure what a "mesh" is.   EnergyPlus's shading calculations 
> result, among other things, in the calculation of sunlit areas for 
surfaces.
> 
> 
> Linda
> 
> EnergyPlus WebSite: http://www.energyplus.gov
> Owner: EnergyPlus_Support list
> Member: EnergyPlus Development Team
> 
> 
> 
> [Non-text portions of this message have been removed]
>




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