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The summary increment of an entropy in open systems in which proceed opposite processes

Pelińska-Olko E.

Systems : journal of transdisciplinary systems science

2008

Vol. 13, spec. iss. 1/2

59--65

The entropy is the important thermodynamic function in help which we can obtain "goodness" of the both right-way and left-way cycles. The concept of the efficiency of the ideal cycles mentioned above is often used in technique. This paper is connected with the summary increment of the entropy obtained for the mutually opposite processes, for example in open systems solid body -its gaseous neighbourhood. The mutually opposite processes are defined as the processes proceeding in the some temperature ranges but in the opposite directions fig.2. It is proved that the summary increments of an entropy are for a cooling higher than in case of a heating, additionally their difference growth with the growth of a temperature range. It is introduced the concept of the relative increment of en entropy for the mutually opposite processes, which could have the significance for a industry.

Comparison of thermodynamic functions calculated by means of various methods

Avsec J., Marcic M.

Journal of Technical Physics

2002

Vol. 43, no 3

309-321

The paper deals with the Lennard-Jones fluid and presents the mathematical model of computating thermodynamic functions of state in the liquid and gas domain by means of statistical thermodynamics. To calculate the thermodynamic properties of a real fluid, we used the Johnson-Zollweg-Gubbins model based on the modified Benedict-Webb-Rubin equation of state, the Chunxi-Yigui-Jiufang equation of state based on the simple perturbation theory, and the complex Tang-Tong-Lu model based on the solution of the Ornstein-Zernike equation obtained by means of the perturbation theory. The analytical results are compared with the thermodynamical data, and with the results obtained from classical thermodynamics.

Description of experimental data in thermodynamics analysis of binary solutions.

Jarosz P., Sukiennik M., Gargul K., Gierlotka W.

Inżynieria Materiałowa

2001

R. XXII, nr 4

392-393

In this work one analysed influence of manner of description of experimental data on counted values of thermodynamical function in binary solution. One ascertained, that large meanings in widened thermodynamical analysis of binary solutions has acquaintance of structural coefficients. It is possible to obtain the reliable results from phase diagram only using interpolation methods. One showed on the ground of thermodynamical analysis of solution Hg-In, that description of activity with functions cubic spline permits on qualification stochiometrics of intermetallic compounds.