Published on December 16, 2025
In heavily regulated industries like aerospace, automotive, and nuclear engineering, specific software versions are validated for compliance. If a project or manufacturing process was certified using REFPROP 9.1, engineers must continue using that exact version to maintain data consistency and regulatory approval. 3. Lower Hardware & OS Requirements
An open-source, free fluid properties database. It matches many of REFPROP's capabilities and integrates directly with Python, MATLAB, and Excel. 2. NIST WebBook
Certain research projects or industrial regulations require results to be generated using specific, validated software versions.
Because it is proprietary software, there is no official "free" full download for REFPROP 9.1. You can obtain it through the following official channels: nist refprop 91 download hot
: Once on the REFPROP page, look for a section or link related to downloading the software. This might be labeled as "Download," "Software," or "Get REFPROP."
While it has been officially superseded by , many researchers and engineers still seek version 9.1 for its specific compatibility with legacy systems and established workflows. Official Download and Acquisition
If your organization already owns a legitimate license for an older version of REFPROP, you can contact NIST directly to inquire about upgrade pathways or legacy version media access. Lower Hardware & OS Requirements An open-source, free
Version 10 optimizes the Fortran code for faster performance.
Here’s a quick comparison to help you decide:
Choose and add your core software install directory (e.g., C:\Program Files\REFPROP ). including natural gas components.
Ensure that refprop.dll is located in your system path or within the exact working directory of the software attempting to call it.
Comprehensive tools for calculating properties of complex mixtures, including natural gas components.
To access the NIST Refprop 9.1 software, follow these steps:
: Explicit equations of state representing the most accurate mathematical models available for pure fluids.
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