Assessment of the Computing Time for the IAPWS-IF97 Equations

[+] Author and Article Information
Kiyoshi Miyagawa

4-12-11-628  Nishiogu, Arakawa-ku, Tokyo 116-0011, Japanmiyagawa.kiyoshi@nifty.ne.jp

J. Eng. Gas Turbines Power 129(3), 885-887 (Oct 29, 2006) (3 pages) doi:10.1115/1.2436576 History: Received August 17, 2006; Revised October 29, 2006

Computing times of equations based on the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam (IAPWS-IF97) were tested. Modern computer systems are optimized for “simple” computational operations, which favors the simple structure of IAPWS-IF97. Provision of “backward equations,” which are approximation of inverse equations, is one of the features of IAPWS-IF97. The backward equations showed much shorter computing times than iterative routines, which had been used to calculate with several independent variables. IAPWS-IF97 is faster than the equations of IAPWS Formulation 1995 for the Thermodynamic properties of Ordinary Water Substance for General and Scientific Use (IAPWS-95) by factors 70 to 200 times.

Copyright © 2007 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Structure of IAPWS-IF97



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