Document Download: R16-17(2018): Revised Release on the IAPWS Formulation 2017 for the Thermodynamic Properties of Heavy Water

Description

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.

Revision History

• This Release was adopted by IAPWS in 2017, replacing the previous Release of 1984 (IAPWS R3-84, which had last been revised in 2005).
• In 2018, the Release was revised with a slightly different formulation in order to more accurately describe properties (especially density) in the liquid phase.

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).