With careful attention to compatibility mode and environment variables, REFPROP 9.1 will continue to serve as an accurate and indispensable tool for thermodynamic calculations for years to come.
Complete Guide to Installing and Configuring REFPROP 9.1 NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP) is the industry standard for calculating the thermophysical properties of fluids and hydrocarbon mixtures. Version 9.1 remains widely used across engineering and academic sectors due to its stability and deep integration with legacy workflows.
Under "System variables," find , select it, and click Edit .
: Read through the NIST end-user license agreement, select I Accept , and click Next . refprop 91 install
menu, she browsed to her folder and enabled the link, ensuring the "Refprp91" box was checked. The Proof: She typed a magic formula: =Density("water","TP","SI",300,1)
Create a new user environment variable named RPPrefix and set its value to your installation path (e.g., C:\Program Files\REFPROP ).
However, installing REFPROP 9.1 on modern Windows operating systems (Windows 10/11) is not always plug-and-play. Legacy installer issues, 32-bit vs. 64-bit conflicts, and licensing hurdles are common. This article provides a step-by-step guide to a successful installation. With careful attention to compatibility mode and environment
If using the popular thermophysical property library , you can route calls to REFPROP by initializing it inside your script:
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. Under "System variables," find , select it, and click Edit
: For educational or student use, a free "Mini" version is available that follows a similar installation wizard process. 2. Linking with Microsoft Excel
Before beginning the installation, ensure your system meets the following requirements:
