Refprop 91 Install Link

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.

Go to Excel Options > Trust Center > Trust Center Settings > Trusted Locations . Click Add new location and add your REFPROP folder path.

Under , click New to create a variable linking directly to your fluid files: Variable name: RPPREFIX

By default, the installer targets C:\Program Files (x86)\REFPROP . It is highly recommended to keep this default path, as many third-party wrappers and API connectors search for REFPROP in this exact location. refprop 91 install

If you need , you are likely either an academic revisiting legacy coursework, a researcher replicating published results, or an industry veteran maintaining older simulation platforms.

Restart your computer or your command prompt/IDE for the changes to take effect. Connecting REFPROP 9.1 to External Software

REFPROP 9.1 installs in "Demo Mode" by default. In Demo Mode, the software functions but randomizes output values , rendering it useless for actual engineering work. Complete Guide to Installing and Configuring REFPROP 9

The application opened the DLL successfully, but the DLL looks for the fluid database ( .FLD files) in its local directory and fails.

Press the , type Environment Variables , and select Edit the system environment variables .

REFPROP's core engine relies on a compiled Fortran dynamic link library ( refprop.dll ). You can link this DLL to various external programming tools. Python Integration Click Add new location and add your REFPROP folder path

Solution: REFPROP 9.1 includes both 32-bit ( refprop.dll ) and 64-bit ( refprop64.dll ) binaries. If your IDE or Excel architecture is 64-bit, ensure your code explicitly targets the 64-bit version of the DLL.

Click and paste the exact path to your REFPROP directory (e.g., C:\Program Files (x86)\REFPROP or C:\REFPROP ). Click OK on all open windows to save the changes.