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Re: [EnergyPlus_Support] Warning explanation needed

I can't understand well about bean shape roof. is it mean circle?

I recommend you that check a BuildingSurface:Detailed in IDF file.

That's a list of surfaces and surface's detail.

And that consist with Vertices coordination. These mean points of each surface.

for example, rectangle made by for point.

Than if you make circle shape surface, that consist with a lot of point.

Then it will make some warning or error.

If you want a making of bean-shape roof(if it means half circle roof) you should change to triangle shape or polygon shape.

I want a it will be help for you work.

2013/9/4 jeannieboef@xxxxxxxxx <jeannieboef@xxxxxxxxx>

Thanks. Would a bean-shaped roof without skylight also have this warning?

It is hard to mentally picture the "shadow clipping". I believe the warning is saying that non-convex receiving surfaces may result in inaccurate shading, but as shadow clipping is not the same as ray tracing, it is hard to visualize. Does the .shd file post a geometry of the shadow which I can then import with OpenStudio to better visualize where the program is placing shadows? That would be an interesting implementation. 

Mit freundlichen Grüßen- Sent from my iPhone (excuse the brevity)

i. A.
Jean Marais
b.i.g. bechtold
Tel.   +49 30 6706662-23

On 04.09.2013, at 08:07, Sungmo Seo <ddims123@xxxxxxxxx> wrote:


I think this warning made by modeling of skylight.

because of skylight, your roof has a hole.

If you want remove this warning, you must cut roof as rectangles

Same like 

l    l   roof              l      l
l    l_____________l      l
l r  l                      l   r   l
l o  l   Skylight       l  o   l
l o  l____________ l  o   l
l f   l      roof           l  f   l

2013/9/3 Linda Lawrie <linda@xxxxxxxxxxxxxx>

Well, it is a warning, not a severe.

Your roof is a receiving surface but it is non-convex.  If you have shading surfaces shading it, it is warning you that the shadowing values could be inaccurate (but may not be)

At 01:42 AM 9/3/2013, jeannieboef@xxxxxxxxx wrote:

   ** Warning ** DetermineShadowingCombinations: Surface="118434_ROOF_0_0_0" is a receiving surface and is non-convex.
   **   ~~~   ** ...Shadowing values may be inaccurate.

The surface is plannar. The zone is non-convex. Surely this only has an effect if a skylight (roof window) had to have light fall downwards, it would also fall "around the corner" and in that way be inaccurate. But this model uses FullExterior, i.e. this warning is moot, right?


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