Complete Guide to Installing and Configuring REFPROP 9.1 NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP) is the industry standard for predicting the thermophysical properties of fluids. Version 9.1 remains widely used in engineering and research for its reliability and compatibility with legacy simulation code. This guide provides a complete, step-by-step walkthrough to successfully install and integrate REFPROP 9.1 on your system. 1. Prerequisites and Installation Package
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Windows requires administrator rights to write to the C:\Program Files (x86) directory and to modify System Environment Variables.
C:\REFPROP (or your specific installation path) refprop 91 install
Installing NIST REFPROP 9.1 typically involves the base software installation on Windows followed by linking the Dynamic Link Library (DLL) to applications like Excel, MATLAB, or Python. 1. Core Software Installation (Windows) REFPROP 9.1 is a licensed software provided by NIST. Run the Installer
: Add the REFPROP directory to your system's "Path" variable to allow the system to locate the REFPROP.DLL Linking REFPROP 9.1 with Microsoft Excel
Which are you trying to link with REFPROP? (Excel, MATLAB, Python, LabVIEW, etc.) Is your software environment 32-bit or 64-bit ? Are you encountering a specific error message right now? Complete Guide to Installing and Configuring REFPROP 9
: Ensure all default components (Executables, Fluid files, Mixture files) are checked. Click Next .
Go to File > Options > Add-ins . In the Manage drop-down at the bottom, select Excel Add-ins and click Go . Click Browse , navigate to your installation folder, select the .xla or .xlam file, and ensure it is checked in the list. Configure Environment Variables (Optional but Recommended):
Default path: C:\Program Files (x86)\REFPROP (on 64-bit systems) or C:\Program Files\REFPROP . If you share with third parties, their policies apply
Before running the installer, ensure your system meets the following criteria:
One of the most common ways to use REFPROP 9.1 is through its Excel Add-in. Locate Add-in Files REFPRP91.XLA REFPROP.xlam is in your main installation folder. Add Trusted Location In Excel, go to
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