If you cannot save changes to fluid mixes, run the REFPROP GUI as an Administrator.
Ensure that "Full Installation" is selected so that all fluid files (.fld) and mixture files (.mix) are included.
At the bottom, select from the "Manage" dropdown and click Go . refprop 91 install
If you see #NAME? in Excel, it usually means the REFPROP.xlam is active but it cannot find the REFPROP.dll in the Windows system folders.
How to Install REFPROP 9.1: A Complete Step-by-Step Guide NIST’s REFPROP (Reference Fluid Thermodynamic and Transport Properties) is the gold standard for researchers and engineers needing accurate thermophysical properties of fluids. While newer versions exist, remains widely used due to its stability and compatibility with legacy academic and industrial software. If you cannot save changes to fluid mixes,
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.
If you are looking to get REFPROP 9.1 up and running on your system, this guide covers the installation process and how to link it with common platforms like Excel, MATLAB, and Python. 1. Prerequisites and System Requirements Before starting, ensure you have the following: If you see #NAME
Windows 7, 8, 10, or 11 (32-bit or 64-bit). 2. Running the Core Installation Launch the Setup: Double-click the REFPROP91.EXE file. License Agreement: Read and accept the NIST license terms.