REFPROP 9.1 is a significant update to the REFPROP series, offering improved performance, new features, and enhanced accuracy. The software provides a comprehensive database of fluid thermodynamic properties, including equations of state, vapor-liquid equilibrium, and transport properties. REFPROP 9.1 supports over 1000 fluids, including refrigerants, hydrocarbons, and other common working fluids.
To call REFPROP 9.1 globally from command lines, IDEs, or programming environments, you must add its directory to your system's PATH environment variable.
Press the , type Environment Variables , and select Edit the system environment variables .
Click and paste your installation path (e.g., C:\Program Files (x86)\REFPROP ). Click OK on all windows. 4. Integrating with Third-Party Software Excel Integration Open Excel and go to File > Options > Add-ins . At the bottom, select Excel Add-ins and click Go . Click Browse and navigate to your REFPROP folder. Select REFPROP.xla (for older Excel) or REFPROP.xlam . refprop 91 install
Many external programming environments look for REFPROP files globally. To allow your system to find the core calculation engine (the DLL file) from any directory, you must add REFPROP to your Windows Environment Variables.
Follow these steps to install the standalone REFPROP application on a Windows machine. Step 1: Run the Installer Locate your downloaded REFPROP91.EXE file. Right-click the file and select . If prompted by User Account Control (UAC), click Yes . Step 2: Navigate the Setup Wizard Welcome Screen: Click Next to begin.
C:\REFPROP (or your specific installation path) REFPROP 9
The easiest way to use REFPROP 9.1 in Python is via the wrapper library ctypes or through the wrapper package ctREFPROP provided by NIST on GitHub.
Administrative privileges are required to write to the program directories and update system environment variables. 2. Step-by-Step Installation on Windows
Under , locate the variable named Path , select it, and click Edit . To call REFPROP 9
The key to a successful upgrade is adhering to the "Pre-Installation" procedure. Uninstall the old version completely before installing the new one. If you have already upgraded without uninstalling, the solution is to perform a clean uninstall of the new version, fully clean your system as described in the pre-installation section, and then reinstall the new version.
REFPROP (Reference Fluid Thermodynamic and Transport Properties) is the industry-standard software developed by the National Institute of Standards and Technology (NIST). Version 9.1 is a legacy iteration that remains widely used in industry for its stability and extensive database of pure fluids and mixtures. Unlike modern subscription models, 9.1 was typically distributed as a perpetual license, making the installation process distinct from newer versions.
The program usually installs to C:\Program Files\REFPROP (or C:\Program Files (x86)\REFPROP on 64-bit systems).