Refprop 91 Free Extra Quality -

, R134a, nitrogen, oxygen, methane, propane, helium, hydrogen, and dodecane.

| Software | Pros | Limitations | |----------|------|--------------| | | Open-source, high-accuracy, many fluids, Python/MATLAB/C++/Excel | No official GUI (but third-party ones exist) | | NIST Refprop Online | Free, web-based | Single-phase pure fluids only, no mixtures | | ThermoState (Python) | Simple interface, free | Limited fluids vs. REFPROP | | REFPROP Lite (if released) | Not available | — |

Fees fund the continued updates of fluid property libraries. How to Get RefProp (The Right Way) refprop 91 free

While (and the newer version 10.0) is a paid product from NIST, they do offer a free alternative called mini-REFPROP . This sample version is designed primarily as a teaching tool for students learning thermodynamics.

Both Mini-REFPROP and CoolProp offer Excel add-ins. Once installed, you can call functions directly inside spreadsheet cells (e.g., =PropsSI("D", "T", 298.15, "P", 101325, "Water") ) to automate your engineering calculations without manual data entry. Summary of Options Fluid Selection Best Use Case Comprehensive (100+ fluids + mixtures) Commercial engineering & research Mini-REFPROP Limited (Water, CO2, Methane, etc.) Academic learning & basic tasks NIST WebBook Broad (Browser-based tables) Quick data lookup CoolProp Free / Open-Source Comprehensive (120+ fluids + mixtures) Coding, automation, & Excel work How to Get RefProp (The Right Way) While

The web is full of third-party sites offering "REFPROP 9.1 free download." This is an extremely dangerous practice. Files from these sources cannot be verified and are often repackaged with malware, spyware, or viruses. Furthermore, downloading and using a cracked version is a violation of NIST's copyright and license agreement, which could expose you or your organization to legal liability.

NIST offers a legitimate, free sample version called mini-REFPROP . It is designed for students and includes only a few common fluids like water, methane, and nitrogen. Once installed, you can call functions directly inside

It restricts mixture calculations to predefined ratios (like basic air) and lacks technical support from NIST. 2. Third-Party Wrapper Trials REFPROP | NIST

Fully compatible with Python, MATLAB, Excel, C++, and LabVIEW.