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[EnergyPlus_Support] Re: modelling a dome
I would also try to keep the number of surfaces in a zone within OpenStudio to 20-30. The plugin has a process to check to see if each surface is a window that gets significantly slower as you have more surfaces. I hope to improve this in the future, but even when we do,just for simulation speed you don't want to create too many surfaces.
When you paste your dome into a zone into a dome in The OpenStudio SketchUp Plug-in make sure you leave the zone open while SketchUp is classifying the surfaces. If you close the zone too soon you may miss some. You can recognize those surfaces as they will be white. If that happens delete one of the edges and re-draw it. that will trigger the classification again.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Edward G. Lyon" <eglyon@...> wrote:
>
> I said it before, simplify (complicate) the geometry into triangular shapes...by yourself...
>
> You are expecting that someone else gave you a perfect tool. In fact, sketchup only has to reasonably render your objects. It does not have to give you a perfectly complete objects that fulfill your every need...
>
> ...and I am an old Unix programmer who is not afraid of the work...so suck it up and draw a representation of your dome....! Then you can get on with your analysis knowing all the simplification you made. Go back to basic geometry texts if you have not learned them the first time around.
>
> Ned Lyon, P.E. (MA)
> Staff Consultant
> SIMPSON GUMPERTZ & HEGER
> 781.907.9000 main
> 781.907.9350 direct
> 781.907.9009 fax
> www.sgh.com
>
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Coy
> Sent: Wednesday, February 23, 2011 6:41 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Re: modelling a dome
>
>
>
> Hi,
>
> This dome thing is extremely frustrating. I thought I had chased out all the voodoo with this thing only to realize I was tricked into thinking i had. Apparently, even though openstudio colored the surfaces corretly in SketchUp, the idf file still contains a missing wedge of surfaces.
>
> I am at my witts end. I have drawn the dome in every possible way; in and outside of thermal zones, copy and paste, circles, archs, elipses, etc.. Invariably I end up with a -vertical row- of trapezoids that are not identified as surfaces. When I right click on these planar pieces i am not give the openstudio > object info choice.
>
> I can't just leave the dome out because the dome is the building, wiht an 11e3 ft^2 base.
>
> Possible reason for the phantom surfaces:
>
> (1) The dome is not half of a sphere. it is eliptical. this may cause some sort of issue in creating the surface map.
>
> (2) The base of the dome is never -perfectly divisible- into a number of sides. So when SkethUp creates the geometry of the dome there are a vertical row of trapezoids that do not have the same size/shape/whatever as the others. SketchUp discriminates these pieces and refuses to recognize they exist.
>
> (3) I did somthing horrible in a former life. Karmic debt.
>
> (4) A large dome can not be modeled using open-studio
>
> Any insight will be greatly appreciated. Thank You!
>
> Coy
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx<mailto:EnergyPlus_Support%40yahoogroups.com>, "coy_mllr" <coy_mllr@> wrote:
> >
> > Hi, I am trying to model a large dome structure in energyplus using openstudio. Thus far, I have been unsuccessfull. It seems openstudio has issues identifying the dome surface as a roof. The program designates one -pie slice- of the dome as a wall. then, when I load the idf into EP launch and run an analysis, energyplus seems to register the -pie slice- as an opening. Is it possible to model a dome in e-plus using open studio? Any suggestions?
> >
> > Thank You!
> >
> > Coy
> >
> > CH2M Hill - intern
> > OIT Renewable Energy Engineering - student
> >
>
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