Strange issues when running energy simulation!

Dear forum

I am preparing a course for students, and unfortunately I am having some strange issues/errors when running energy simulation.

It is difficult to give a explanation on why and when it happens because I can run a simulation with out any problems, but suddenly it seems to the script that should start the different commands point to a wrong path/place. If I then start a from scratch again it works. But the same happen again at certain point.

Other times I experience UMI does not simulate some of the buildings. If I instead simulate one building at a time, and then the second and so on, it works better but not always. When I look in the folders it seems during the process it "forget" to create some of the files.

The biggest problems comes when I bake geometry from GH.

Any clear explanation on these issues?

I am really looking forward when the energy part comes to GH and it gets possible to simulate non orthogonal buildings. I see a huge potential with UMI!



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Hi Daniel,

> The biggest problems comes when I bake geometry from GH.

Yes. Strangely when run in Rhino 4, Umi encounters this problem less frequently, but Rhino 5 tends to get into trouble. I include this comment because the thermal portions of Umi were originally developed for Rhino 4.

Both of your error logs include the line, "EnergyPlus Terminated--Error(s) Detected." Are .err files created in the individual subfolders for the buildings which fail in c:\Urban-Modeling\Simulation Files\RhinoFileName\?

Thank you,


So you guys are aware of the issues.

I am not sure what you mean by "fail in ..."

To conclude - UMI have a lot of issues and limitations at the moment, so I should wait until there is a release that works better with rhino 5 before I try to implement UMI into a course?

Maybe you would like to look at this question about diva:

Thanks for your replay.


It just boils down to that there are a lot of modeling requirements for Umi right now. Actually, these limitations are being worked on. Unfortunately, Rhino 5 compounds the issue a bit more than we would care for.

I'm forwarding your DIVA question to the appropriate people.



Thanks Alstan!

Looking forward to a more stable versions.


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In Short

Umi is a Rhino-based design environment for architects and urban planners interested in modeling the environmental performance of neighborhoods and cities with respect to operational and embodied energy use, walkability and daylighting potential. Since 2012, Umi has been  developed by the Sustainable Design Lab at the Massachusetts Institute of Technology with support from a National Science Foundation EFRI_SEED project, the MIT Energy Initiative, the Kuwait-MIT Center, the Center for Complex Engineering Systems (CCES) at KACST and MIT, Transsolar Climate Engineering and United Technologies Corporation. Further tool developed is now also being conducted at the Environmental Systems Lab at Cornell University.

A first public version of Umi was released during a public symposium on Sustainable Urban Design on May 6th 2013 at the Massachusetts Institute of Technology. Version 2.0, which also includes an embodied energy module, was released on November 7th 2014.

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