If you want a 12 section circular dome of 1 meter radius, the x, y, z valures are:
Base: 1.0, 0.866, 0.5, 0.0, -0.5, -0.866, -1.0 for x,y conbinations, z = 0.0.
First trapeze top: cos 30° = 0.866 . all the above numbers should be multiplied with 0.866. z= sin 30° = 0.5,
The next row of trapeze base is the same as the first trapeze top. Z= 0.5.
Second trapeze top: cos 60° = 0.5. This is used to multiply the first base number. Z = 0.866
The last top circle uses triangles: Base is the same as the second trapeze top. Z = 0.866.
The top of the triangle is x = 0.0, y = 0.0, and Z = 1, the radius of the dome. You may replace this section with a flat piece of glass with 12 corners.
====================
You will have 10 different numbers per trapeze. Once you have figured out how they should be arranged to form the vertices, you can write a EPlus macro to fill in a complete object for the wall section.
Define three EPlus macros to generate all the base wall objects, by number and name substitution. The macro would place the ten numbers in the correct places for the vertices with the unique wall name, zone name, construction, etc.
Add or subtract 0.001 from the wall dimension for the glass window, as a imbedded macro.
72 macro lines would complete the dome. The origin of the zone object may be used to install the dome in different locations.
I have not written the macro. If the idea does not work, please let me know. Larger dome may require more sections. The principle is the same.
You may also try to generate the ten number row with the help of a spread sheet.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: coy_mllr@xxxxxxxxx
Date: Wed, 23 Feb 2011 23:40:52 +0000
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, "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
>
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, "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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