Mechanics & Industry
Volume 20, Number 5, 2019
|Number of page(s)||12|
|Published online||15 July 2019|
Energy and exergy comparison of three similar combined power cycles
Thermo-fluid Department, School of Mechanical Engineering, Shiraz University, Shiraz, Iran
2 Department of Mechanics, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
* e-mail: H.Nemati@miau.ac.ir
Accepted: 22 March 2019
Three similar combined power cycles were compared from energy and exergy aspect during one day. Enormous different data were collected every five minutes. In common exergy analysis, it is only possible to determine main sources of exergy destructions. These sources are mainly equipment in which severe irreversible process, i.e. combustion is going on. However, it is clear that nothing can be done to reduce these kinds of irreversibilities in an operating cycle. Here, it has been shown that in contrast to usual researches, the energy and exergy comparison of different power cycles lead to useful improvements in their performance. Moreover, since the ambient temperature was changed more than 10 °C, ambient temperature impacts on equipment were studied based on those collected data. The effect of evaporative coolers is the other objective, which was proceeded to. Since coolers only come into the service in the afternoon, those collected data were a valuable source to study the effect of adding moisture. Due to air high moisture content, it was not possible to use dry air assumption and more complicated equations were needed to simulate combustion process. Results show which equipment needs more attention during maintains which is useful in similar plants.
Key words: Exergy destruction / combined cycle / thermodynamic optimization / entropy generation
© AFM, EDP Sciences 2019
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