REFPROP is a proprietary database and is not available for free download through official channels .

Searching for unofficial downloads of REFPROP 9.1 carries significant risks:

Search for (the official designation for REFPROP).

If you are looking for a or explanation on how to use it,1? How to upgrade your existing license? A comparison of fluid models between 9.1 and 10.0? REFPROP | NIST

: NIST added a native 64-bit Dynamic Link Library (DLL) file to seamlessly call calculations from 64-bit Excel, MATLAB, and LabVIEW.

If you are looking to update your current software, you can place an order on the NIST website to ensure you have the latest and most secure version.

NIST REFPROP is a proprietary database managed under the Standard Reference Data (SRD) program of the U.S. Department of Commerce. It is not open-source or free software. Standard Acquisition Pathway

: Version 10 maintains support for "old" routines from 9.1, allowing legacy Excel files to function without immediate code changes. Modern Support

If you have previously purchased 9.1 and need a replacement installer for a reinstallation, NIST staff may provide a link upon request via email at ian.bell@nist.gov or data@nist.gov . Free Trial: MINI-REFPROP

NIST REFPROP is and is not available for free download as a full version.

NIST REFPROP is not free software, which is why search terms often include keywords like "hot," "crack," or "free." Users are often looking for a way to bypass the standard licensing fees, which can be significant for individual consultants or small firms.

It implemented high-accuracy equations of state, primarily based on the Helmholtz energy form , designed to match underlying experimental data as closely as possible.

Browse to your directory, choose REFPROP.xlam , and save the configuration. You can now call functions like =Density("water","TP","SI",300,1) directly within cells. MATLAB, Python, and LabVIEW Integration

, a widely used program for calculating the thermodynamic and transport properties of industrially important fluids.

Are you interested in a detailed feature comparison between and the open-source CoolProp library? Share public link

Employs Helmhotz-energy-based equations of state, which represent the highest level of accuracy available for fluid property modeling.