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Re: [EnergyPlus_Support] EnergyPlus Allowed geometries
At 05:36 AM 3/11/02, Andy Tindale wrote:
>1. I understand that EP v.1.0 can only model surfaces which are convex
>polygons with 3 or 4 vertices. Is this still true of v.1.0.1? If so when
>do you expect this limitation to be lifted?
It is still true in v 1.0.1. We hope to replace the algorithms that deal
with surface shapes/shadings (which is really the reason for the
limitation) in v1.1
>2. In EP v.1.0 windows must be rectangular. This means that I cannot model
>(amongst other things) atrium roofs at present. This is because the
>DesignBuilder simulation software that I am developing triangulates between
>user defined roof points to create a set of surfaces. Triangular windows
>would be great! Do you have a date for a fix for this?
Same answer as #1, I think.
>3. Most other simulation codes I have worked with have been non-geometric,
>in the sense that surfaces were defined simply as an area facing a
>particular direction. This approach typically uses an external, geometric
>modelling package to generate shading data for each surface. Is there a way
>of working like this with EP?
Probably the best answer I can give to this is to use the
"MinimalShadowing" option rather than one of the more complete ones of
"FullExterior" or "FullInteriorAndExterior" in the Building object. The
MinimalShadowing option does not calculate building self shading and other
similar features and would be more appropriate for surfaces that are
defined as you described. Of course, for direct EnergyPlus input you will
still need the 3 or 4 vertices.
We did not embody simplifications of this nature into the EnergyPlus engine
-- we hope that people writing input interfaces would take something of
"area" and "facing" and translate that into "proper" EnergyPlus vertices.
Linda
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