Refprop 91 Install !new! Jun 2026

Ensure your Python architecture (32-bit or 64-bit) matches your refprop.dll version.

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.

, many researchers and engineers continue to use version 9.1 for consistency with older projects. System Requirements

At the bottom, select from the "Manage" dropdown and click Go . refprop 91 install

Before beginning the installation, ensure your system meets the following requirements:

Under , look for the variable named Path (or PATH ), select it, and click Edit .

REFPROP is not merely a database of measured values; it is a powerful calculation engine. It uses some of the most accurate pure fluid and mixture models available, typically equations of state explicit in Helmholtz energy, to predict properties across a wide range of liquid, gas, and two-phase states. Ensure your Python architecture (32-bit or 64-bit) matches

Windows requires administrator rights to write to the C:\Program Files (x86) directory and to modify System Environment Variables.

Navigate to the directory containing your REFPROP 91 installation files. This is typically provided as a downloadable executable (e.g., REFPROP91.exe ) or an ISO file. If you have an ISO, mount it to a virtual drive to access the setup file.

. When the cell returned a perfect value instead of an error, she knew the bond was sealed. The Shadow of the Past , many researchers and engineers continue to use version 9

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.

: Find the REFPRP91.XLA file, typically located in your main REFPROP installation folder (e.g., C:\Program Files (x86)\REFPROP ).

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.

Read through the NIST End User License Agreement (EULA). Click or Accept to proceed to the next window. Step 3: Choose the Destination Directory