: To ensure functions work, open the Visual Basic editor (Alt + F11) and verify that Refprop91Code appears under your modules. Troubleshooting Common Setup Issues
While REFPROP 9.1 predates widespread Python support, you can still call its DLL using ctypes :
Now, let’s walk through the actual process. I will assume you have a legitimate installer named something like REFPROP91_setup.exe .
At the bottom, select from the "Manage" dropdown and click Go .
Right-click the executable file and select Run as administrator . refprop 91 install
One of the most powerful features of REFPROP 9.1 is its Excel add-in. Follow these steps to ensure the .xlam file is trusted and properly installed: Open Microsoft Excel.
A licensed copy of the REFPROP 9.1 installer executable (typically named REFPROP91.EXE or provided via a secure NIST download link). Step-by-Step Installation of REFPROP 9.1
Before initiating the installation, ensure your system meets the necessary software and hardware criteria. Operating System Compatibility Windows 7, 8, 10, and 11 (32-bit and 64-bit architectures). Linux environments (via shared object library compilation).
The RPprefix environment variable instructs any program (like Excel or MATLAB) where to find the REFPROP core files (FLUIDS, MIXTURES folders). An incorrectly set RPprefix is a primary reason why interfaces fail to locate property files. : To ensure functions work, open the Visual
Once finished, you can launch the graphical user interface (GUI) to calculate thermodynamic properties and view tables or plots. 3. Linking with Excel (Windows)
Right-click the setup executable and select . This ensures the installer can write to protected directories like Program Files and modify system registry keys.
Pro-tip: If you plan on using Python or MATLAB extensively, some users prefer installing to a simpler path like C:\REFPROP to avoid permission issues or "Space in filename" errors in code.
Installing REFPROP 9.1 requires careful attention to file paths, especially when linking it to Excel. This guide covers the installation process from start to finish. 1. Prerequisites for Installation Before starting, ensure you have: The REFPROP 9.1 setup executable ( REFPROP91.exeREFPROP91.exe or similar). Your license key/file. Administrator rights on your computer. 2. Step-by-Step Installation Process Run the REFPROP91.exe file. Follow the Setup Wizard: Agree to the license agreement. At the bottom, select from the "Manage" dropdown
Article last updated: 2025 – for informational purposes. NIST REFPROP is a registered trademark of the National Institute of Standards and Technology.
Windows 7, 8, 10, or 11 (32-bit or 64-bit architectures). Disk Space: Approximately 300 MB of free hard drive space.
Under , locate the variable named Path , select it, and click Edit .
