Refprop 91 Install

If you need to perform a clean refprop 91 install because the first attempt failed:

Cause: Path mismatch or missing fluid database files.
Solution: Reinstall using the Custom option and explicitly select every fluid group. Alternatively, set the environment variable REFPROP_FLUID_PATH to the folder containing .FLD files.

Navigate to Start Menu > NIST REFPROP 9.1 > REFPROP. The application should open, showing a window titled “NIST Reference Fluid Thermodynamic and Transport Properties Database.” refprop 91 install

Select a fluid (e.g., Water) and click “Calculate Saturation Table.” If numbers appear, your installation is healthy.

The true power of REFPROP 9.1 lies in its use as a calculation engine for other programs. The installer automatically places the necessary files here: If you need to perform a clean refprop

REFPROP 9.1 includes a MATLAB interface via refpropm.m. Copy the script from the installation folder to your MATLAB working directory. Usage example:

[rho, h, s] = refpropm('DH','T',300,'P',101.325,'water');

This is the most common failure point for new users. REFPROP 9.1 installs in "Demo Mode" by default. In Demo Mode, the software functions but randomizes output values, rendering it useless for actual engineering work. Cause : Path mismatch or missing fluid database files

To activate the full version:

*Note: Some versions used a specific REFPROP.key file that simply needed to be pasted into the installation folder. Overwriting the placeholder key with your purchased key