The setup wizard will guide you through the license agreement and destination folder selection. The default installation path is usually C:\Program Files\REFPROP or C:\Program Files (x86)\REFPROP .
NIST provides a refpropm.m file that acts as a gateway between MATLAB and the DLL.
Execute the nist2391.exe or Setup.exe file from your installation source. refprop 91 install
REFPROP, short for erence Fluid PROP erties, is a program developed and distributed by the National Institute of Standards and Technology (NIST) as Standard Reference Database 23 (SRD 23). It is a cornerstone for engineers and scientists working with refrigerants, hydrocarbons, natural gas, and other industrially important fluids, particularly in fields like HVAC&R, chemical engineering, and energy systems.
Integrating REFPROP 9.1 with Excel is one of its most common uses, allowing you to use thermodynamic functions directly in spreadsheets. The setup wizard will guide you through the
Some older installers trigger false positives in modern antivirus software (e.g., Windows Defender, McAfee). The installer uses self-extracting archives that may be flagged as suspicious. Disable real-time protection just for the installation duration, then re-enable it afterward.
The installer typically opens with a language selection (English/German/Japanese). Click “OK.” Then, read the NIST Software License Agreement. You must check “I accept the agreement” to proceed. Execute the nist2391
If you are setting this up for a university or work environment, you may also look into "Mini-Refprop" versions. If you'd like, I can:
EES has a built-in REFPROP call. After installation, simply write:
It is designed for Windows environments; older documentation suggests compatibility back to Windows 95/NT, but it remains functional on modern Windows 10/11 systems with proper user permissions. Linking to Microsoft Excel
If you get an error saying a fluid file (like NITROGEN.FLD ) is missing, ensure you are running the application from the directory where the /fluids/ folder is located.