This happens if the program doesn't know where the /fluids folder is. Go to the REFPROP GUI, select Options > Paths , and ensure the path points to your installation folder.
Example: density = refpropm('D', 'T', 300, 'P', 101.325, 'water')
By default, the installer suggests C:\Program Files (x86)\REFPROP . refprop 91 install
Ensure that "Full Installation" is selected so that all fluid files (.fld) and mixture files (.mix) are included.
You will need to point your script to refprop.dll . Ensure your Python environment is the same "bitness" (32-bit vs 64-bit) as the DLL you are calling. 6. Troubleshooting Common Errors This happens if the program doesn't know where
If you cannot save changes to fluid mixes, run the REFPROP GUI as an Administrator.
Installing REFPROP 9.1 is straightforward, but the real work lies in the for your specific external software. Always ensure your .dll files are in a location where your system's PATH environment variable can find them. Ensure that "Full Installation" is selected so that
You will need permission to write to the C:\Program Files (x86) directory.