Graphic interpretation of exergy problem of ideal gas in characteristic thermodynamics diagrams

1. Branko Pejović, Tehnološki fakultet u Istočnom Sarajevu, Republic of Srpska, Bosnia and Herzegovina
2. Duško Kostić, Tehnološki fakultet u Istočnom Sarajevu, Republic of Srpska, Bosnia and Herzegovina
3. Mitar Perušić, Tehnološki fakultet u Istočnom Sarajevu, Republic of Srpska, Bosnia and Herzegovina
4. Zoran Obrenovic, Tehnološki fakultet u Istočnom Sarajevu, Republic of Srpska, Bosnia and Herzegovina
5. Vladimir Damjanović, Fabrika "Birač" a.d. Zvornik, Republic of Srpska, Bosnia and Herzegovina

In paper it is analyzed in details and given graphically solution of this complex problem, based on relation for exergy ie maximal technical work in open thermodynamics systems. Based on this analysis for more complete view and better looking at the process, general model for graphical interpretation of exergy in p-v, h-s, and T-s diagrams is obtained, which is at the same time the most important both for theory and for practice. Model covers four characteristic cases depending on ratio of initial and final parameters of pressure and temperature.
Representation in work p-v diagram is derived from definition itself of technical work, while representation in T-s diagram is obtained from definition of exergy. In both cases, equivalent areas are defined. Representation of exergy in h-s diagram is obtained over the appropriate lines, using slope of tangent on characteristic isobara.
The goal of the paper is systematization of characteristic cases of exergy of open systems in general thermodynamics diagrams in one example based on which other similar cases will be solving. Considering that this problem is not solved and analyzed in details in literature.
Proposed general graphic models can be effectively used for solving and analysis of many practical and theoretical problems in exergy area.

Ključne reči: Maximal technical work; open systems; thermodynamics analysis; graphical methods; graphical representation

Tematska oblast: SIMPOZIJUM A - Nauka materije, kondenzovane materije i fizika čvrstog stanja

Datum: 27.06.2019.

Contemporary Materials 2019 - Savremeni Materijali

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