RAPID AND ACCURATE CALCULATION FORMULA OF THERMODYNAMIC PROPERTIES g(T, p), h(T, p) AND s(T, p) OF WATER AND STEAM
IAPWS-IF97 is widely applied to current industrial calculations of thermodynamic properties; however, its calculation speed is still too slow for many applications such as heat cycles optimizing and computational fluid dynamics where computing speed is much important. In this paper, a bi-quadratic spline interpolation method is introduced to establish rapid computation formula for the thermodynamic properties g(T,p), h(T,p) and s(T,p) of water and stream. The computational domain with the temperature from 273.16 K to 1073.15 K, and pressure from 0.001 MPa to 100 MPa, is discretized using a double-girds technique. The bi-quadratic spline function has nine coefficients much less than that of IAPWS-IF97 (typically dozens coefficients) and has a simpler function form, thus the computing speed can be expected to be higher than IAPWS-IF97. Based on data calculated from IAPWS-95 formulation, the coefficients of the bi-quadratic spline functions, g(T,p), h(T,p) and s(T,p), are determined using self-compiling C++program. Results show that spline functions, g(T,p), h(T,p) and s(T,p), has an excellence performance superior to that of IAPWS-IF97 standard equation with higher accuracy and far fast computing speed. The average computing time of g(T,p), h(T,p) and s(T,p) from IAPWS-IF97 is about 11-640 times of that from the present spline functions for various calculation regions.
Zhi-Xue Wang Xiao-Dong Wang Bin An Xin-Xin Zhang Yuan-Yuan Duan
Department of Thermal Engineering, School of Mechanical Engineering, University of Science & Technol Department of Thermal Engineering, School of Mechanical Engineering, University of Science & Technol Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua Universi
国际会议
The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)
北京
英文
82-88
2010-10-19（万方平台首次上网日期，不代表论文的发表时间）