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IAPWS R15-11
Release on the IAPWS Formulation 2011 for the Thermal Conductivity of Ordinary Water Substance
September 2011

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This formulation is recommended for the calculation of the thermal conductivity of ordinary water in its fluid phases.
The formulation consists of a dilute-gas term that is only a function of temperature, a finite-density term as a function of temperature and density, and a near-critical term as a function of temperature and density.
The region of validity the entire stable fluid region from the melting curve to 1173 K at pressures to 100 MPa, with lower maximum temperatures at higher pressures up to 1000 MPa; see the release document for details. It extrapolates in a physically reasonable way outside this region.

Online calculation
The Russian National Committee of IAPWS (through Moscow Power Engineering Institute) has provided online calculation pages, which may be useful in program development and verification. Note that IAPWS is not responsible for the content of these online calculation pages:

Revision History

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 September 21, 2016

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