File > Options > Trust Center > Trust Center Settings > Trusted Locations C:\Program Files\REFPROP as a trusted location to ensure macros can run. Activate the Add-in File > Options > Add-ins At the bottom, select Excel Add-ins from the "Manage" dropdown and click Browse to your REFPROP folder and select the Verify the Connection : Test a simple command in a cell, such as =Density("water","TP","SI",300,1) , to ensure properties are being pulled correctly. Troubleshooting Common Issues Answers to Frequently Asked Questions - NIST Pages
Note: This is complex. Many users prefer to use , which wraps REFPROP, but CoolProp may require REFPROP 10.0+. refprop 91 install
Windows 7, 8, 10, or 11 (32-bit or 64-bit). 2. Running the Core Installation Launch the Setup: Double-click the REFPROP91.EXE file. License Agreement: Read and accept the NIST license terms. File > Options > Trust Center > Trust
The installer will ask if you wish to install: Many users prefer to use , which wraps
Add your installation path to the existing Path variable to ensure Excel can always locate the required DLLs ( REFPROP.DLL or REFPRP64.DLL ). 4. Common Troubleshooting Answers to Frequently Asked Questions - NIST Pages