converging problem caused by 'zone group' object
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).
But some zones did not converge even after 100 warmup days.
If I change it in sketchup, put the three stories together, like:
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!
Can you provide the two models via, e.g., Google Drive or Dropbox?
https://drive.google.com/drive/folder...
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.
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.
https://drive.google.com/file/d/1-J9z... Please try with this weather file
Both IDFs ran successfully for me using that weather file.
The "not correctly defined surfaces" in the warnings, that's the surfaces between the non multiplied floor and multiplied floor. Like f-ceiling1 and m-floor1, F-ceiling1 is the ceiling of f-zone1, the zone right above it is m-zone1, which has m-floor1.f-ceiling1 and m-ceiling1 should be directly touching each other. But because the m floor has multiplier as 5, they are not touching each other in the model. I hope you can get what I mean.