Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question

How to run models with many different weather files and set output excel name accordingly ?

asked 2020-12-09 19:56:48 -0600

BL's avatar

updated 2020-12-09 20:10:54 -0600

How to run a model with many different weather files and set output excel name accordingly ? For instance, I have two models and 20 weather files, how can I automate the simulation process and have outputs ? Is there any tutorial with this ? Is it doable with Python ? Thank you

edit retag flag offensive close merge delete

1 Answer

Sort by » oldest newest most voted

answered 2020-12-10 05:53:57 -0600

updated 2020-12-10 08:21:23 -0600

The EP-Launch program allows you to do that if you're on windows. See the "Group of Input Files" tab.

Otherwise yes, use a python (or whatever language) script. I would recommend not bothering trying to rename the output files, instead use the -d, --output-directory ARG arg to set the output directory.

I started throwing a small example to get you started, and then I figured I might as well take another couple of minutes and turn it into a github repo so it can be used by others. So here's a crude way of running multiple simulations in parallel using python: just paste your own .epw and .idf into the root folder and python

Under the hood it uses multiprocessing to run simulations in parallel, and offloads to subprocess for runs.

Github: jmarrec/RunMultipleSimulationsInParallel

And here is the direct link to the python snippet:

Note that if you really want filenames and not output directories to uniquely identify each sim, it'd be terribly easy to add this here on line 49:

if res.returncode != 0:
    # simulation worked, copy the output file
    out_file = os.path.join(out_dir, "eplusout.csv")
    dest_file = os.path.join("Reports", f"{idf}_-_{epw}.csv")
    shutil.copyfile(out_file, dest_file)

(of course, import shutil at top of file)

edit flag offensive delete link more


Thank you so much for the response. I downloaded the example folder and run it in jupyter notebook. It get stuck in the last cell. Do I need to change the ROOT_DIR and args of run_single_simulation ? What else do I need to change for the example files ?
Also I run in in pycharm IDE, it gave me following erros: FileNotFoundError: [WinError 2] The system cannot find the file specified

I placed the entire example folder under the Energyplu root folder

BL's avatar BL  ( 2020-12-10 09:12:41 -0600 )edit

Can you run the .py script and give me the actual traceback output...? Did you pip/conda install tqdm too?

Julien Marrec's avatar Julien Marrec  ( 2020-12-10 09:39:28 -0600 )edit

The way I (again, VERY QUICKLY) coded this is that you would drop your IDF/EPW into the root folder after cloning it. If you want to run it against the C:\EnergyPlusV-9-4-0\ExampleFiles\ dir, you have to make minor modifications to the way I compute paths. I'm not going to do customer service on this one, I'm sure you'll figure it out.

Julien Marrec's avatar Julien Marrec  ( 2020-12-10 09:41:06 -0600 )edit

AS fdor the FileNotFoundError, I would reckon you do not have energyplus.exein your path. Either add the directory of E+ to your path or Change this line

cmd = f"C:\EnergyPlus-V-4-0\energyplus.exe -w {epw_path} -d {out_dir} {idf_path}"

Julien Marrec's avatar Julien Marrec  ( 2020-12-10 09:45:47 -0600 )edit

File "C:\Users\user\anaconda3\lib\multiprocessing\", line 125, in worker result = (True, func(args, kwds)) File "C:\Users\user\Desktop\RunMultipleSimulationsInParallel-main\", line 43, in run_single_simulation res =, capture_output=True) File "C:\Users\user\anaconda3\lib\", line 489, in run with Popen(popenargs, **kwargs) as process: File "C:\Users\\anaconda3\lib\", line 854, in __init__ self._execute_child(args, executable, preexec_fn, close_fds

BL's avatar BL  ( 2020-12-10 09:49:05 -0600 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Training Workshops

Question Tools



Asked: 2020-12-09 19:56:48 -0600

Seen: 190 times

Last updated: Dec 10 '20