Hi, Bernd
I am interested to know what is the surfaces as part of a thermal activated concrete ceiling. Were you trying to include the thermal expansion variation into the surface dimension entries?
Normally, ceiling is flat. If one side is flat and the other surface changes, you can use the flat surface and leave the other side undefined.
I usually get this type of small errors due to importing design from another software. I would look at the adjacent surfaces, whether I can compensate manually. For example, if the error vertex is on a wall, and the wall edges are parallel/vertical, you can add the error to the surface and make it flat. The wall will now be a parallelogram and still remains flat.
However, adjusting the error in this way is a little tricky, because the error is caused by the conversion rounding off error. If you re-import the design again, the error may be moved to some where else.
If you are converting the dimensions from inch to meter, for example, try keeping the inches to the nearest fraction before conversion, or enter the same decimal number for the ceiling height and a flat ground floor.
For roof and shades, etc., the two triangle method is a quicker fix on the IDF file, by splitting surface into two, using a text editor. If you group the x,y,z, on the same line for each vertex, the change can be very easy carried out and verified.
Duplicate the object, delete the 3rd vertex from the original object, change the name of the new object, and delete the first vertex. To change the vertex number from 4 to 3 can be done with find and replace for the whole group of objects.
However, your errors are about one millimeter each, and can therefore be ignored.
I am a member of the group, and not an EPus support person.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: bernd.worm@xxxxxxxxx
Date: Mon, 20 Oct 2008 00:15:27 -0700
Subject: Re: [EnergyPlus_Support] Re: non-planar
|
Hello,
Thank you very much for the answer. I know that I'll get a deviation in the calculation results, but I talked about this with my tutor and he said it would be ok, when the non-planar surfaces wouldn't end in a great error.
But I don't realy understand your sentence about User to User Forum. If I said something wrong or in a rude way please excuse me, that wasn't my intention. My English isn't very well and so the messages maybe sounds different as I think it sounds.
Best regards,
Bernd
--- On Sun, 10/19/08, Linda Lawrie <linda@lawrie.com> wrote:
From: Linda Lawrie <linda@lawrie.com>
Subject: Re: [EnergyPlus_Support] Re: non-planar
To: EnergyPlus_Support@yahoogroups.com
Date: Sunday, October 19, 2008, 2:49 PM
Remember this is now a user-to-user forum.
Yes, you can likely ignore these small out of plane diifferences.
But it's your thesis, not mine.
Linda
At 05:42 AM 10/15/2008, bernd.worm wrote:
Hello,
I have a similar problem like it is described below. I'm designing a
building with a complex geometry and so I have non planar surfaces
between the ceiling and the façade. How far will this effect the
simulation? Or can I ignore these minimal (between 0,137 and 1,505mm)
non-planar surfaces? I'm asking, because it would be very difficult to
straighten this out (for example divide them up into triangles),
because the surfaces are part of a thermal activated concrete ceiling.
Thank you for help.
Best regards,
Bernd Worm
Non-planar surfaces:
Possible non-planar surface:"TBA 11", Max "out of line"=1.37667E-003
at Vertex # 1
Possible non-planar surface:"TBA 1", Max "out of line"=1.23966E-004 at
Vertex # 2
Possible non-planar surface:"TBA 2", Max "out of line"=3.69127E-004 at
Vertex # 1
Possible non-planar surface:"TBA 3", Max "out of line"=6.07086E-004 at
Vertex # 2
Possible non-planar surface:"TBA 4", Max "out of line"=8.32281E-004 at
Vertex # 1
Possible non-planar surface:"TBA 5", Max "out of line"=1.03877E-003 at
Vertex # 2
Possible non-planar surface:"TBA 6", Max "out of line"=1.21873E-003 at
Vertex # 2
Possible non-planar surface:"TBA 7", Max "out of line"=1.36336E-003 at
Vertex # 2
Possible non-planar surface:"TBA 8", Max "out of line"=1.46234E-003 at
Vertex # 2
Possible non-planar surface:"TBA 9", Max "out of line"=1.50545E-003 at
Vertex # 1
Possible non-planar surface:"TBA 10", Max "out of line"=1.47954E-003
at Vertex # 1
Possible non-planar surface:"TBA 12", Max "out of line"=1.19066E-003
at Vertex # 2
Possible non-planar surface:"TBA 13", Max "out of line"=9.22960E-004
at Vertex # 1
Possible non-planar surface:"TBA 14", Max "out of line"=5.85343E-004
at Vertex # 4
Possible non-planar surface:"TBA 15", Max "out of line"=2.00987E-004
at Vertex # 3
--- In EnergyPlus_Support@ yahoogroups. com, Linda Lawrie <linda@...> wrote:
>
> It depends on how far they are out of planar and what you are trying
> to study with your model.
>
> At 05:02 PM 3/30/2008, Danny Bishop wrote:
> >I have a model that has some non-planar surfaces, and some adjacent
surfaces
> >that are non-coplanar. Given that these are just out, will this
introduce
> >any significant errors to the calculations? It will be quite an
effort to
> >straighten these out, and not worth it if the difference is minimal.
>
> Linda
>
> EnergyPlus WebSite: http://www.energypl us.gov
> Owner: EnergyPlus_Support list
> Member: EnergyPlus Development Team
>
>
>
> [Non-text portions of this message have been removed]
>
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