Re: [EnergyPlus_Support] Problem with window geometry (2 methods) : EPlus crashed

2011/6/14 Richard Raustad <RRaustad@xxxxxxxxxxxx>

I ran your file (window_geometry_simple_rectangular with Chicago weather) here and it completed successfully.

Are you using the interim release as found on:

http://energyplus.helpserve.com/

On 6/14/2011 11:00 AM, Mathieu LAMOUR wrote:
Thank you for your response, and sorry if i'm not clear.

Of course my wall area is bigger than the glass one (in fact, that's one of the think i ckecked with OpenStudio plugin/Sketchup).
In the case that there are 36 windows of 1 m², there's a wall (opaque) suface anyway, because its area is 3.4*3.4 m²
Thus, my windows, in all the cases, are included onto an exterior wall (you can have a look at my .idf files if you want).

I keep thinking that the problem may come from the "simple method" or maybe from the big number of windows?

Thank you again
2011/6/14 Richard Raustad <RRaustad@xxxxxxxxxxxx>
....GenOpt to decide if the each window is 1 m² or 0.0000001 m².

The wall has to be bigger than the window (i.e., there has to be wall area at the edge of the glass). If your window is 1mx1m, then the wall is all glass which would mean there was no wall (or 0 wall area).
Try limiting the window size to 0.999 m2 to 0.001 m2

On 6/14/2011 10:40 AM, lamour.mathieu wrote:

Hi all,

I'm having some problems of « EnergyPlus crashed », due to "forrtl:error <65>: floating invalid".

I'm, for instance, just testing something, coupling EPlus and GenOpt. So It's a quite simple model (a cube 6*6*6 m), whom faces are divided into a "mesh" of 36 squares (that will be a double pane window or an opaque surface, except for the floor).

For now, before implementing my GenOpt model, I tried to run a simulation with a nearly full glazed south surface, but there occur my problem (with 36 windows). When I run with less windows, it makes no problem, but trying with 36 windows, it indicates that EPlus crashed. So I'm quite sure it comes from my geometric model or from the "simple method". Any idea about this?

The main problem is that I really need to use the simple rectangular objects (with X and Z origin and Length and Height, for more convenience in my GenOpt implementation). But :
- Writing my .idf file this way, I verify the conform geometry into OpenStudio's Sketchup plugin : everything is fine, the windows appear as I expect
- Running this same .idf file (without any modification with OpenStudio), EPlus crashes?
- So I export my .idf file from sketchup, through OpenStudio plugin, and I obtain the same windows, but with the detailed vertex entry objects (that means in my case 4 vertices, with their coordinates "x, y, z"). I run a simulation and? it works!
- The same happens with windows on each faces

So I can't understand what's happening with the simple rectangular objects method? The fact is, one more time, that I need to use this geometric description method to facilitate my work with GenOpt.
It's the 2nd time in few days that this crash happens (the other time, it was with another model, that I'd like to present you in another post).

I really don't understand, for it's the first time I have to face such a problem. I tried to change some parameters in my .idf file, but it's still the same problem?

I uploaded the 2 files in Files > _Problem_Submittals > window_geometry_2methods

If anybody has an idea, it would be great!

Thank you in advance

Waiting for instructions?

Mathieu

Ps : I know that, in a normal case, I should design a single big window, but the final goal is to make possible for GenOpt to decide if the each window is 1 m² or 0.0000001 m². That's why I need so many windows in each surface. I thought it would take more calculation time, but that it would work?
-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL  32922-5703
Phone:   (321) 638-1454
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--
Mathieu
-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL  32922-5703
Phone:   (321) 638-1454
Fax:     (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu

UCF - From Promise to Prominence: Celebrating 40 Years