Prepare & Submit Calculation FormThe thermodynamic and transport properties of light water can be calculated according to the property equations presented in:
 Keyes F.G., Keenan J.H., Hill P.G. and Moore J.G., "A Fundamental Equation for Liquid and Vapor Water", Proceedings of the 7th International Conference on the Properties of Steam, Tokyo, Japan 1968.
 Schmidt E., "Properties of Water and Steam in SI Units", Springer-Verlag, 1969.
 Sengers J.V. and Watson J.T.R., "Improved International Formulations for the Viscocity and Thermal Conductivity of Water Substance", Journal of Physical Chemistry Reference Data, 15(4):1291, 1986.
 Straub J., Rosner N. und Grigull U., "Oberflaechenspannung von Leichtem und Schwerem Wasser", Waerme- und Stoffuebertragung, 13:241, 1980.
Based mainly on the above references property equations have been implemented in the LIGHT_WASP (LIGHT Water And Steam Properties) FORTRAN 77 code in the course of the following PhD work (in Greek):
Petropoulos N.P., "THERMOPHYSICAL PROPERTIES OF NUCLEAR POWER REACTOR COOLANTS: COMPARATIVE STUDY AND CALCULATION CODES", Nuclear Engineering Section, Mechanical Engineering Department, National Technical University of Athens, 2000 (in progress).
The set of equations used provide reliable thermodynamic and transport properties results equivalent to the industrial standard formulation IFC-1967. The following validity range is covered:
0 - 1000 bar
0 -1000 oC
small region at the vicinity of the critical point is excluded:
|Ô - Ô*| £ 10 Ê, |ñ/ñ* - 1| £ 0.3
T*= 647.27 K
and ñ*= 317.763 kg/m3
|Specific volume v in m3/kg||Density ñ in kg/m3|
|Internal energy u in kJ/kg||Specific enthalpy h in kJ/kg|
|Entropy s in kJ/(kgK)||Isobaric heat capacity cp in kJ/(kgK)|
|Isochoric heat capacity cv in kJ/(kgK)||Viscosity ç in kg/(ms)|
|Thermal conductivity ë in W/(mK)||Surface tension ó in N/m.|
Code accepts the following input pair:
(P,T) in bars and degrees Centigrate respectively.
This WWW page is maintained regularly to ensure best performance and error-free accurate calculations for the thermodynamic and transport properties of light (ordivary) water. All efforts have been made to ensure that the present code is as accurate implementation as possible of the property equations included at the above literature. Authors welcome your comments and suggestions for further improvement along with any bug reports and they will acknowledge any reported bug in this very page under the link reported bugs regardless whether they are fixed or not.
Nick P. Petropoulos (email@example.com)
Nuclear Engineering Section
Mechanical Engineering Dept.
National Technical University of Athens
15780 Athens, GREECE
authors will not try to fix all reported bugs promptly, and they will certainly
not be ivolved in an effort to improve performance of the property equations in
pressure - temperature regions, where their results are ambiguous or not to be trusted.
Furthermore, authors cannot accept ANY
responsibility if some or all calculations based on this code may be proven
wrong or inadequate.Visitors of this page, who would like to receive free copies of the source
code for their own private use or for evaluating purposes are encouraged to
place a request at firstname.lastname@example.org,
stating also their intented implementation platform (i.e. FORTRAN make & version, UNIX
or Windows based application etc).
Not all requests are to be granted. This version of the software is not
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