Engineering Mechanics

Proceedings Vol. 11 (2005)

ENGINEERING MECHANICS 2005

NATIONAL CONFERENCE WITH INTERNATIONAL PARTICIPATION
May 9 – 12, 2005, Svratka, Czech Republic

;

Editors: Vladimír Fuis, Petr Krejčí and Tomáš Návrat

ISBN 80-85918-93-5 (printed)
ISSN 1805-8248 (printed)
ISSN 1805-8256 (electronic)

The first variants of a new system of simple, middle accurate approximations of some state variables and derivatives of wet vapor of H2O

Bayer Z.
pages 45 - +9p., full text

A set of approximations for the specific volume of saturated liquid and saturated vapor, saturation pressure and for the isothermal derivatives (∂π/∂ϕ´)_τ , (∂π/∂ϕ“)_τ including a concept of some theirs combinations is given. It is shown that the accuracy of approximations depends both on the approximated quantity and on its approximating analytical form. The accuracy moves between a percentage fraction up to 5 % of maximum value of the pertinent function. After a numerous tests the function τ^X1.(1−τ)^X2 has been chosen as a general approximation function. The values of exponents and coefficients optimized by the least squares method, the courses of approximated quantities and their approximating functions as well as their deviations from correct data are given.

back to list of papers

Text and facts may be copied and used freely, but credit should be given to these Proceedings.

All papers were reviewed by members of the scientific committee.

Engineering Mechanics

International Conference

Proceedings Vol. 11 (2005)

ENGINEERING MECHANICS 2005