REFPROP

REFPROP is a software program for the prediction of thermophysical properties of <a href="/facts/Fluid/wLnMhBC0">fluids</a>, developed by the <a href="/facts/National_Institute_of_Standards_and_Technology/gr9Fnh85">National Institute of Standards and Technology</a> (NIST).
The primary component of REFPROP is an <a href="/facts/Equation_of_state/tLILkepz">equation of state</a> for each implemented fluid. For most pure fluids, the equation of state is obtained by fitting an expression for the <a href="/facts/Helmholtz_free_energy/2AK0HpPe">Helmholtz free energy</a> to experimental data. This formulation allows the computation of all equilibrium properties of the fluid, such as density, temperature, pressure, <a href="/facts/Sound_speed/dYtbt1nf">sound speed</a>, <a href="/facts/Heat_capacity/I63nzSyp">heat capacity</a>, <a href="/facts/Second_virial_coefficient/Dnus06Ep">second virial coefficients</a>, <a href="/facts/Vapor_pressure/whrEr96T">vapor pressures</a>, saturated liquid and vapor densities, <a href="/facts/Enthalpy_of_vaporization/TbEWQDNl">enthalpy of vaporization</a>, <a href="/facts/Entropy/s52IXeFz">entropy</a>, and the <a href="/facts/Joule-Thomson_coefficient/9MLL4NeG">Joule-Thomson coefficient</a>.
REFPROP also predicts <a href="/facts/Surface_tension/EuluYmSM">surface tension</a>, <a href="/facts/Viscosity/QLVfrdCz">viscosity</a>, and <a href="/facts/Thermal_conductivity/qWnSG3nQ">thermal conductivity</a> for many fluids, either using extended corresponding states formulations or fluid-specific equations fit directly to experimental data.
Various methods are used to compute the analogous properties of fluid mixtures.
The full list of fluids properties implemented in REFPROP v10.0 can be found in Table 2 of Huber, et al. (2022).

REFPROP open-in-new

REFPROP