Refprop 91 Install Jun 2026

The RPprefix environment variable instructs any program (like Excel or MATLAB) where to find the REFPROP core files (FLUIDS, MIXTURES folders). An incorrectly set RPprefix is a primary reason why interfaces fail to locate property files.

Ensure all components, including the main executable, fluid data files ( .fld ), and mixture files ( .mix ), are checked. Click and then Install . Step 5: Complete the Wizard

To use REFPROP 9.1 in MATLAB, you need a wrapper file (often provided in the MATLAB subfolder of the installation). In MATLAB, use addpath('C:\Program Files (x86)\REFPROP') . Use the refpropm.m function to call properties. refprop 91 install

With a clean system, installing REFPROP 9.1 itself is straightforward.

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

: Go to the Developer tab and click on Excel Add-ins .

Completing a successful is a rite of passage for engineers working with thermodynamic properties. While newer versions exist, version 9.1 remains a reliable workhorse for legacy systems, academic replication, and enterprise simulation pipelines. Use the refpropm

: If the functions return errors, ensure REFPROP.DLL is in your system path or the same directory as your application.

This guide applies to REFPROP Version 9.1 (circa 2013). For the latest updates, please visit the official NIST REFPROP website.