(Reference Fluid Thermodynamic and Transport Properties) is the gold standard software ecosystem for calculating the thermophysical properties of industrially important fluids and their mixtures. Developed by the National Institute of Standards and Technology (NIST), it serves as the foundational reference database across chemical engineering, aerospace design, cryogenics, and HVAC industries.
The impact of REFPROP is pervasive across multiple engineering sectors. In the industry, REFPROP has been instrumental in the transition away from ozone-depleting refrigerants (CFCs/HCFCs) toward low-global-warming-potential (GWP) alternatives. Engineers use it to precisely model cycle performance, determine compressor work, and size heat exchangers. refprop
NIST REFPROP represents the state-of-the-art in the calculation of thermophysical properties. By implementing fundamental Helmholtz energy equations and rigorously fitted binary interaction parameters, it provides engineers and scientists with a reliable tool for predicting fluid behavior. As energy systems evolve toward higher efficiency and lower emissions, the demand for precision in thermodynamic modeling will only increase, cementing REFPROP’s role as an indispensable resource in the engineering toolkit. In the industry, REFPROP has been instrumental in
REFPROP, NIST, Thermodynamics, Equation of State, Helmholtz Energy, Fluid Properties. Equation of State
While equations of state define equilibrium states, transport properties are calculated using separate models. REFPROP incorporates the extended corresponding states (ECS) method, fluid-specific correlations, and, where available, reference-quality equations for viscosity and thermal conductivity. This ensures that these vital dynamic properties maintain consistency with the thermodynamic states calculated by the EOS.
Historically, engineers relied on generalized correlations (such as the Peng-Robinson or Soave-Redlich-Kwong equations of state) which offer reasonable approximations but often lack precision near the critical point or for complex mixtures. To address the need for a high-accuracy standard, the National Institute of Standards and Technology (NIST) developed REFPROP. This database has evolved into the gold standard for fluid property calculations, providing models that are continuously updated to reflect the latest experimental data and theoretical advancements.
The primary strength of REFPROP is its . Because it is maintained by NIST, the underlying data is subject to rigorous, peer-reviewed validation against experimental benchmarks. This gives users confidence that a simulation run in 2024 will yield the same results as one run in 2010. Additionally, its integration with major engineering platforms (MATLAB, Python, Excel via the REFPROP DLL) allows for seamless incorporation into larger simulation workflows.
