Engineers, researchers, and students in thermodynamics frequently search for to access high-accuracy fluid property data. Developed by the National Institute of Standards and Technology (NIST), REFPROP (Reference Fluid Thermodynamic and Transport Properties) is the industry standard for calculating the properties of refrigerants, hydrocarbons, and natural gas mixtures.
Options are available for corporate or academic institutions, with pricing based on the number of users. 3. Key Features of REFPROP 9.1
For some niche mixtures or extremely high-precision research, NIST’s proprietary models are still considered the "gold standard." B. NIST Webbook (Online Access)
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To help you get set up with the right thermodynamic tools, please let me know: What do you need to model? refprop 91 free
Is this for an or commercial product design ?
Specifically designed to target engineering workstations.
Even if you manage to install a cracked version without being infected, the software is often unstable. These cracked files are frequently altered, leading to crashes, corrupted data, and inaccurate property calculations. In several technical forums, users have reported that using outdated or improperly installed versions (e.g., 9.1 instead of the patched 9.1.1) can lead to "non-deterministic behaviour" in flash calculations, meaning the software will give different results for the same input. For an engineer or scientist, an unreliable tool is worse than no tool at all.
Allows you to generate isothermal, isobaric, and isochoric data tables. This link or copies made by others cannot be deleted
However, users looking for free access have several legitimate options: 1. The Mini-REFPROP Demonstration Version NIST provides a free, limited version called .
Getting a feel for the interface and calculation logic.
It is a web interface and cannot be directly integrated into Excel or Python loops. 2. Mini-REFPROP (Free Limited Version)
REFPROP (REFriference Fluid PROPerties) is a computational database developed by NIST to provide highly accurate thermophysical properties for industrially important fluids and their mixtures. It has become the global standard for the refrigeration, natural gas, and aerospace industries because it implements the most precise models available, primarily based on Helmholtz energy equations of state. These models ensure thermodynamic consistency across gas, liquid, and supercritical states. Differences Between Versions In several technical forums
Wraps seamlessly into Python, MATLAB, Excel, C++, and C#. Cost: 100% free for both academic and commercial use. CoolProp vs. REFPROP Comparison Cost Paid license required Free (Open-Source) Fluid Library Extensive (Complex mixtures) Vast (Standard mixtures) Python/Excel Support Industry Standing Strict Gold Standard Highly Respected Alternative How to Properly Purchase and Download REFPROP
: Accessible directly via the official NIST TRC mini-REFPROP portal . Option B: Third-Party Trial Managers
REFPROP 9.1 Free: Understanding the Limitations and Alternatives for NIST Properties
For developers, open-source platforms like OpenModelica can interact with fluid property libraries. While this often requires the DLL (which requires a license), it shows how to integrate the backend with free software. 3. CoolProp