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):
The primary installation typically occurs from a CD-ROM or an executable installer file. refprop 91 install
For decades, the National Institute of Standards and Technology (NIST) has maintained REFPROP (short for REfrigerant PROPerties ) as the definitive program for calculating thermodynamic and transport properties of fluids. Version 9.1, while not the absolute latest release, remains widely used due to its stability and compatibility with older simulation platforms like EES, MATLAB, and LabVIEW. Go to File > Options > Add-ins