Accession Number : AD0684085

Title :   A SPLINE-FUNCTION METHOD FOR GENERATING THE THERMODYNAMIC PROPERTIES OF WATER SUBSTANCE.

Descriptive Note : Research and development rept.,

Corporate Author : NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER WASHINGTON D C APPLIED MATHEMATICS LAB

Personal Author(s) : Schot,Joanna W.

Report Date : NOV 1968

Pagination or Media Count : 60

Abstract : A computer formulation of the thermodynamic properties of water in the supercritical region is described, based on an application of cubic spline functions to fit data given in the 1963 International Skeleton Table: Specific Volume of Compressed Water and Superheated Steam. A thermal equation of state is obtained in the form of a doubly cubic spline function, representing specific volume as a function of pressure and temperature. This expression is then used directly in the equations defining enthalpy, entropy, and the Gibbs free-enthalpy function to generate these thermodynamic properties over the indicated range of the International Tables. The cubic spline function has also been used to fit the saturation line as well as the specific volume data for saturated water and saturated steam. Double precision arithmetic is used to retain a sufficient number of significant figures. The accuracy of the computed output is well within the range of tolerances specified in the skeleton tables. In this report, the mathematical formulation is described, the computer program is outlined, and the computational results are presented. (Author)

Descriptors :   (*STEAM, *THERMODYNAMICS), COMPUTER PROGRAMMING, EQUATIONS OF STATE, TABLES(DATA), WATER, PRESSURE, TEMPERATURE, VOLUME, FUNCTIONS(MATHEMATICS), SYMPOSIA

Subject Categories : Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE