Problem with Drangonfly and Urban Weather Generator

Replies to This Discussion

Permalink Reply by Chris Mackey on April 10, 2017 at 10:16am

Hi Angelo,

Thanks for using Dragonfly and I think this results from having wall/roof construction materials that are thinner than 1 cm.  Having materials this thin messes up the UWG's heat flow calculation through the construction and I would recommend removing such thin materials as they usually have a negligible effect on the results.  If you upload your Dragonfly GH file, I can check whether this is the case.

I know the new UWG has a check for construction materials this thin and, once I upgrade Dragonfly to this new version, you should not have to worry about this type of error again.

-Chris

Permalink Reply by Angelo Figliola on April 10, 2017 at 10:38am

Hi Chris,

Thanks for your fast reply!

I was using your file to test the Dragonfly workflow that i should use for an upcoming research. I checked the file and seems that there aren't such a thinner materials. Anyway, i upload the GH file for double checking the issue.

Thank you again.

Attachments:

• UWG_Outdoor research_13.gh, 1.1 MB

Permalink Reply by Chris Mackey on April 10, 2017 at 11:53am

Angelo,

I'm going to need some more time to look at this and I'll hopefully get back to you tonight once I can sit down for a while.

-Chris

Permalink Reply by Angelo Figliola on April 10, 2017 at 1:31pm

Hi Chris,

Don't worry about that. Take your time and thank you again for helping me to solve the problem.

Angelo

Permalink Reply by Chris Mackey on April 10, 2017 at 8:31pm

Angelo,

I was able to run the GH file that you uploaded with the Bremen EPW on my machine at home:

I am going to try uninstalling / reinstalling my UWG to see if something could be messing up in the setup as I know others have had issues as well.

-Chris

Permalink Reply by Chris Mackey on April 10, 2017 at 9:41pm

Angelo,

I found out what the error was.  Drangonfly_Dragonfly downloads some supporting UWG files in the background to help run the simulation and it seems that github changed its conventions for how to download such supporting files from repositories.  I have fixed this with these commits to the UWG:

https://github.com/hansukyang/UWG_Matlab/commit/3f1ca09ce27a1056fab...

To get everything fixed on your machine, you should navigate to C:\ladybug and delete the UWG folder there.  Next, load up the attached script or the updated Hydra example file:

http://hydrashare.github.io/hydra/viewer?owner=chriswmackey&for...

Then everything should run fine. Let me know if this fixes everything on your end.

-Chris

Attachments:

• UWG_Workflow.gh, 1.1 MB

Permalink Reply by Angelo Figliola on April 11, 2017 at 1:48am

Chris,

Thank you for your support! Now, everything work fine!

All the best,

Angelo

Permalink Reply by Chris Mackey on April 11, 2017 at 8:33am

Gad to hear it!