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EPPY error in running simulation using IDF.Run

asked 2021-08-08 06:10:29 -0500

Samuel de Vries's avatar

updated 2021-08-08 08:29:53 -0500


I'm running into some errors in trying to run an EnergyPlus simulation through EPPY. I am working on a Windows OS. To give a simple example of the error I am trying to run the '1ZoneUncontrolled.idf' with EnergyPlus 8.5 from the E+ examples with an EPW for Amsterdam (renamed 'someWeather.epw' here).

When I run the following python code (all these files are containted within the current 'C:\Z_TestEPPY' directory):

# Import libraries
import eppy
import sys
import os
from eppy.modeleditor import IDF

iddfile = "Energy+V8_5_0.idd"

idfname = '1ZoneUncontrolled.idf'
epwfile = 'someWeather.epw'

Idf = IDF(idfname, epwfile)

I get the following errors:

ERROR: Could not find input data dictionary: C:\Users\20171493\AppData\Local\Temp\tmp79zt77cw\Energy+V8_5_0.idd.
Type 'energyplus --help' for usage.
Traceback (most recent call last):
  File "C:\Python39\lib\site-packages\eppy\runner\", line 356, in run
  File "C:\Python39\lib\", line 373, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['C:/EnergyPlusV8-5-0\\energyplus.exe', '--weather', 'C:\\Z_TestEPPY\\someWeather.epw', '--output-directory', 'C:\\Z_TestEPPY', '--idd', 'Energy+V8_5_0.idd', 'C:\\Z_TestEPPY\\in.idf']' returned non-zero exit status 1.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python39\lib\site-packages\eppy\", line 1010, in run
    run(self, weather=epw, idd=idd, **kwargs)
  File "C:\Python39\lib\site-packages\eppy\runner\", line 361, in run
    raise EnergyPlusRunError(message)

Contents of EnergyPlus error file at C:\Z_TestEPPY\eplusout.err
<File not found>

I run into this error regardless of the directory, idf or EnergyPlus version that I use. I noted that in the line 'C:/EnergyPlusV8-5-0\e' in the error message there is an inconsistency in the path directory seperators where C:/ does not have an escape character before it. Also the in.idf file does not get created.

Here you can find a link to all the files that I am using in this example.

Kind regards,


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Have you tried using full paths for iddfile, idfname, and epwfile?

JasonGlazer's avatar JasonGlazer  ( 2021-08-09 09:54:06 -0500 )edit

Yes; that worked! The problem also appeared to be caused by the IDF name starting with a number.

When I used the full path " idfname = 'C:\Z_TestEPPY\1ZoneUncontrolled.idf' " was turned into " idfname = 'C:\Z_TestEPPY\e1ZoneUncontrolled.idf' ". When I changed it to " idfname = 'C:\Z_TestEPPY\someInput.idf' " it worked.

Thanks for the quick response!

Samuel de Vries's avatar Samuel de Vries  ( 2021-08-09 13:50:40 -0500 )edit

1 Answer

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answered 2021-08-09 13:52:19 -0500

Samuel de Vries's avatar

updated 2021-08-09 13:53:53 -0500

Solved by JasonGlazer in comments:

  • Use full path name for input files

  • Do not start name of input file with a number

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Asked: 2021-08-08 06:10:29 -0500

Seen: 330 times

Last updated: Aug 09 '21