20.500.12556/DKUM-66811 Exergy analysis of a Brayton cycle with variable physical properties and variable composition of working substance Eksergijska analiza Braytonovog ciklusa s promjenjivim fizikalnim svojstvima i promjenjivim sastavom radne tvari 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. 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. Brayton cycle variable physical properties variable composition of working substance maximum work output maximum thermal efficiency Braytonov cikel spremenljive fizikalne lastnosti variabilna sestava delovne snovi največja delovna moč največja toplotna učinkovitost true false true Angleški jezik Hrvaški jezik Znanstveno delo 2017-07-12 08:09:29 2017-07-12 08:10:17 2022-08-01 13:11:51 2019-07-11 15:59:42 2016 0 0 str. 801-808 št. 3 Letn. 23 2016 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1330-3651 620.9 15346181 1024231260 10.17559/TV-20160208112755 1330-3651 URN:SI:UM:DK:7EUNT1KT Tehnicki_vjesnik_2016_Zivic_et_al._Exergy_analysis_of_a_Brayton_cycle_with_variable_physical_properties_and_variable_composition_of_work.pdf Tehnicki_vjesnik_2016_Zivic_et_al._Exergy_analysis_of_a_Brayton_cycle_with_variable_physical_properties_and_variable_composition_of_work.pdf 1 745A5F28E1133A38FBBDD2589DBCBB6A 9b8b3876fe29880b36996d98c22aaae6397c4af2f1075da20df007daa26bc178 65aeb1d4-7c0e-11eb-bb7a-00155d0001ca 20.500.12556/dkum/82173195-d8da-419d-a88a-f82b0603c249 https://dk.um.si/Dokument.php?lang=slv&id=114028 http://hrcak.srce.hr/160140 1 https://dk.um.si/Dokument.php?lang=slv&id=114027 Fakulteta za energetiko 0 0 0