Refprop 91 Install ((exclusive)) -

Administrative privileges are required to write to the C:\Program Files (x86) directory.

REFPROP 9.1 uses environment variables to locate its fluid data ( fluids\ , mixtures\ ). Sometimes the installer does not set this correctly.

: Click Install to extract and place the files. Finish : Click Finish to complete the wizard. Configuring System Environment Variables refprop 91 install

How to Install REFPROP 9.1: A Complete Step-by-Step Guide REFPROP (Reference Fluid Thermodynamic and Transport Properties), developed by NIST, is the gold standard for scientists and engineers needing accurate properties of industrially important fluids and mixtures. While newer versions exist, remains widely used in legacy academic environments and specific industrial workflows.

A: Likely not. NIST strongly encourages upgrading. If you have proof of purchase, contact refprop@nist.gov – but be prepared for a “no.” Administrative privileges are required to write to the

If you encounter issues during installation or while using REFPROP 9.1, refer to the:

Many external applications access REFPROP via its Dynamic Link Library ( refprop.dll ). For your computer to find this DLL globally, you must add the REFPROP directory to your Windows System Path. : Click Install to extract and place the files

: It is recommended to keep this default path as many external wrappers (like Excel) look for this specific directory. Environment Variables (Optional but Recommended)

NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP) is the industry standard for predicting the thermophysical properties of fluids and fluid mixtures. Version 9.1 remains widely utilized in engineering, academia, and industrial design due to its stability and deep integration with legacy simulation tools.

The installer will prompt you to choose a destination folder.