Nist Refprop 9 !!hot!! Jun 2026
: Users can define new mixtures by name and composition, or change specific mixture parameters to fit specialized research needs.
Accurate calculations of pressure, temperature, density, enthalpy, entropy, and heat capacity.
Modeling Organic Rankine Cycles (ORC) utilizing geothermal or waste heat.
The GUI in v9 is with separate windows for:
for calculating the thermodynamic and transport properties of industrially important fluids and their mixtures. It is widely considered the "gold standard" in industry and academia for high-accuracy fluid property modeling. National Institute of Standards and Technology (.gov) Key Capabilities and Features Property Calculations nist refprop 9
National Institute of Standards and Technology, Standard Reference Data Program, Gaithersburg (2010). Context and Applications
The data underlying these models was not simply collected; it was meticulously culled from thousands of experimental measurements, some dating back to the 1800s, and critically assessed to create the most accurate representation possible. Even with this high standard, some correlations, such as those for ammonia, deuterium, ethanol, and neon, were identified in later literature as having room for improvement relative to other data sources.
For developers, the DLL integration allows embedding these high-accuracy properties directly into customized software solutions.
By simply replacing the DLL from version 8.0 with the new one from version 9.0 or 9.1, user-created code could be updated without any internal changes, as the input and output structures of the calling routines remained identical. NIST provided sample programs in to guide developers, and the Excel spreadsheet integration via the DLL was particularly popular, enabling users to perform calculations directly in a familiar spreadsheet environment. This approach allowed for advanced and reproducible property calculations within the comfort of a standard office suite. : Users can define new mixtures by name
If you want, I can:
The software provides highly accurate calculations for a wide range of properties over various conditions (liquid, gas, and supercritical phases):
The accuracy and depth of REFPROP 9.1 made it an indispensable tool for engineers and scientists in a variety of industries:
REFPROP 9 is a computer program used to calculate the thermodynamic and transport properties of pure fluids and mixtures. Researchers frequently cite this version in papers involving: The GUI in v9 is with separate windows
For rapid property lookups, as often done for Brayton cycles. MATLAB/LabVIEW: For complex, automated simulation cycles.
REFPROP 9 is a critical tool across multiple high-stakes industries: ResearchGate
stands for REF erence Fluid PROPerties. Developed by the NIST Physical Measurement Laboratory, specifically within the Thermodynamic Research Center (TRC), it is a software package that uses highly accurate, fundamental equations of state to calculate thermodynamic and transport properties of pure components and mixtures.
NIST REFPROP 9 stands as a landmark in the history of applied thermodynamics. While its time as the flagship software has passed, its legacy is undeniable. It introduced a level of accuracy and reliability that fundamentally reshaped high-precision industries, such as flow metering. It set a new benchmark for how accessible and powerful a thermophysical property database could be.
For pure fluids, REFPROP 9 primarily utilizes wide-range equations of state formulated in terms of . These models are explicitly explicit in dimensionless Helmholtz energy, using temperature and density as the independent variables. This mathematical formulation allows for the direct derivation of all other thermodynamic properties through differentiation, minimizing compounding computational errors. Modified Benedict-Webb-Rubin (MBWR) Equation
