Press the , type environment variables , and press Enter .
: Required to write to the C:\Program Files (x86) directory and modify system environment variables.
Here’s a helpful feature for installing (assuming you meant version 9.1, since REFPROP 10.x is more common now — but if you meant NIST REFPROP 9.1, the following applies):
However, installing REFPROP 9.1 on modern Windows operating systems (Windows 10/11) is not always plug-and-play. Legacy installer issues, 32-bit vs. 64-bit conflicts, and licensing hurdles are common. This article provides a step-by-step guide to a successful installation. refprop 91 install
After installation, REFPROP 91 can be launched from the Start menu (Windows) or Applications folder (macOS). The software's graphical user interface (GUI) provides access to various features, including:
The recommended default folder is C:\Program Files\REFPROP or C:\Program Files (x86)\REFPROP .
If you are setting this up for a university or work environment, you may also look into "Mini-Refprop" versions. If you'd like, I can: Press the , type environment variables , and press Enter
Check the box next to REFPROP and click . A new set of custom thermodynamic functions will now be available in your worksheets. 6. Troubleshooting Common Issues Error: "Could not find fluid file"
Go to Excel Options > Trust Center > Trust Center Settings > Trusted Locations . Click Add new location and add your REFPROP folder path.
: It is recommended to keep this default path as many external wrappers (like Excel) look for this specific directory. Environment Variables (Optional but Recommended) Legacy installer issues, 32-bit vs
: Windows XP through Windows 11 (32-bit or 64-bit).
NIST provides a refpropm.m file that acts as a gateway between MATLAB and the DLL.