Živić, Marija and Galović, Antun and Avsec, Jurij and Holik, Mario (2016) Exergy analysis of a Brayton cycle with variable physical properties and variable composition of working substance. = Exergy analysis of a Brayton cycle with variable physical properties and variable composition of working substance. Tehnički vjesnik : znanstveno-stručni časopis tehničkih fakulteta Sveučilišta u Osijeku, 23 (3). pp. 801-808. ISSN 1848-6339. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q3 (2016). Točan broj autora: 4.
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Exergy Analysis of a Brayton Cycle With Variable Physical Properties and Variable Composition of Working Substance.pdf - Published Version Jezik dokumenta:English Download (764kB) | Preview |
Abstract (Croatian)
U radu je provedena eksergijska analiza Braytonovog ciklusa. Četiri ulazne varijable, omjer tlakova na izlazu i ulazu u kompresor, omjer temperature na ulazu u turbinu i temperature na ulazu u kompresor, te izentropski stupnjevi djelovanja kompresora i turbine su uzeti u analizu. Omjer temperatura je variran tako da je temperatura zraka na ulazu u kompresor držana konstantnom, a temperatura dimnih plinova na ulazu u turbinu je varirana od 900 °C do 1200 °C. U komori za izgaranje potpuno izgara metan s pretičkom zraka koji je određen temperaturom dimnih plinova na ulazu u turbinu. Analiza nadalje uključuje promjenjivost molarnih toplinskih kapaciteta zraka i dimnih plinova s temperaturom i promjenjivost njihovih izentropskih eksponenata. Eksergijska destrukcija u komori za izgaranje, turbini i kompresoru kao i ukupna eksergijska efikasnost su uzete u analizu.
Abstract
The exergy analysis of a Brayton cycle is performed in the paper. The four input variables: the ratio of the compressor exit and inlet pressures, the ratio of inlet temperature of gases in turbine and inlet temperature of air in compressor and the isentropic efficiencies of the compressor and turbine are analysed. The temperature ratio is varied in a way that the compressor inlet temperature of air is maintained constant, while the turbine inlet temperature of flue gases is varied from 900 to 1200°C. In the combustion chamber methane is completely combusted with excess air ratio which is determined by the temperature of flue gases at the turbine inlet. The analysis further includes variability of the molar heat capacities of air and flue gases with temperature and variability of their heat capacity ratios. The exergy destruction in turbine, compressor and combustion chamber and also total exergy efficiency of the cycle are considered in the analysis.
| Item Type: | Article (["eprint_fieldopt_article_type_article" not defined]) |
|---|---|
| Uncontrolled Keywords: | Braytonov ciklus, promjenjiva fizikalna svojstva, promjenjiv sastav radne tvari, maksimalni neto rad, maksimalni stupanj djelovanja |
| Keywords (Croatian): | Brayton cycle, variable physical properties, variable composition of working substance, maximum work output, maximum thermal efficiency |
| Subjects: | TECHNICAL SCIENCE > Mechanical Engineering |
| Divisions: | 300 Department of Thermodynamics, Thermal and Process Engineering > 310 Chair of Technical Thermodynamics |
| Indexed in Web of Science: | Yes |
| Indexed in Current Contents: | No |
| Citations JCR: | 0 (08.03.2018.) |
| Quartiles: | Q3 (2016) |
| Date Deposited: | 07 Feb 2017 08:26 |
| Last Modified: | 08 Mar 2018 13:48 |
| URI: | http://repozitorij.fsb.hr/id/eprint/7223 |
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