converging problem caused by 'zone group' object

asked 2022-05-02 11:54:14 -0500

Liza Lee's avatar

updated 2022-05-03 00:36:24 -0500

Hi, there. I’ve met a problem when I try to simulate a seven-story building with EnergyPlus. I used ‘zone group’ object, because the five stories in the middle are exactly the same (as below). image description But some zones did not converge even after 100 warmup days. If I change it in sketchup, put the three stories together, like: image description Meanwhile, in 'zone group' object in energyplus, the ‘zone list multiplier' of middle floor is still 5. The converging problem disappear. So my question is, can I use the modle in second picture to simulate this seven-story building? The results such as energy consumption will be correct? Or there are other ways to solve the converging problem? (changing convergence tolerance values or maximum warm up days didn't work) Thank you!

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Can you provide the two models via, e.g., Google Drive or Dropbox?

shorowit's avatar shorowit  ( 2022-05-03 09:10:52 -0500 )edit

Both IDF files ran successfully for me in E+ 8.7 using both of these weather files, so I can't reproduce the issue. That said, there are a lot of warnings in the eplusout.err file that suggest some of the surfaces may not be correctly defined.

shorowit's avatar shorowit  ( 2022-05-04 10:34:04 -0500 )edit

sorry, hang on, I will upload the weather file I used. And yes, the problem didn't show up all the time, like this same IDF file with same weather file, some runperiod don't have the problem.

Liza Lee's avatar Liza Lee  ( 2022-05-04 10:42:14 -0500 )edit Please try with this weather file

Liza Lee's avatar Liza Lee  ( 2022-05-04 10:46:58 -0500 )edit