This formulation is recommended for the calculation of thermodynamic properties of heavy water in its fluid phases, including vapor-liquid equilibrium.
The formulation is for the Helmholtz energy as a function of temperature and density; appropriate combinations of derivatives can produce any thermodynamic property desired (pressure, sound speed, heat capacity, enthalpy, entropy, etc.).
The formulation is valid in the entire stable fluid region from the melting and sublimation curves to 825 K at pressures to 1200 MPa. It extrapolates in a physically reasonable way outside this region.
The development of the formulation and comparisons to available data are described in detail in a scientific article.
This Release is the product of the Working Group "Thermophysical Properties of Water and Steam" (TPWS) of the International Association for the Properties of Water and Steam (IAPWS).
This page updated December 21, 2018