Weather file not running in BEopt

asked 2026-04-09 13:14:50 -0500

Camilla
11 ●1

We found some weather files predicting future weather rather than relying on past weather data. I was able to put them in the weather file for Beopt, so they show up in the menu and I can even see the data in the data viewer but when I try to use it to run a simulation it gives me this error "No such file or directory @rb_sysopen-C:/Users/pmdon/Documents/BEopt_3.0.1/TEMP1/1/run/../../USA_OR_PDX_ETONZF_Future-cache.csv"

and it cannot run the simulation.

This seems to be a temporary file that Beopt makes while running a simulation. If it is open during the simulation I see the weather file show up there.

Maybe there is something wrong with the weather file? (although I can see it in the data viewer) I got it from here https://www.energytrust.org/commercia...

answered 2026-04-13 19:21:22 -0500

shorowit

13050 ●234 ●9 https://www.nlr.gov/bu...

BEopt is supposed to create the weather cache file on the fly but there appear to be situations where it doesn't. If you are a reasonably savvy user, you can force BEopt to create the cache files like so:

Copy the EPW files into your BEopt weather dir: C:\Users\USERNAME\Documents\BEopt_3.0.1\Weather\
Open Windows Powershell
Navigate to the BEopt install dir: cd 'C:\Program Files (x86)\NREL\BEopt_3.0.1\'
Run this command to generate the cache files: .\Include\OpenStudio\bin\openstudio.exe .\Workflow\run_simulation.rb --cache-weather C:\Users\USERNAME\Documents\BEopt_3.0.1\Weather\

You may see some messages appear that are safe to ignore. But if it worked correctly, cache files will be generated in your weather dir for any EPW file that doesn't have a cache file already.

If that doesn't work or you can't figure it out, feel free to email me and I can send you the necessary cache files.

(FWIW we are removing the need for the cache files for the next version of BEopt, but I do not know when it will be released.)