Thermodynamic Comparison and Optimization of Supercritical Brayton Cycles with a Bottoming Transcritical Cycle
Publication: Journal of Energy Engineering
Volume 142, Issue 3
Abstract
This study investigated the feasibility of a combined cycle comprising a topping cycle and a bottoming cycle ( cycle). A simple cycle and a recompression cycle were considered as the topping configurations. Thermodynamic analyses and comparison were performed to evaluate the effects of key thermodynamic parameters on the behavior of combined cycles. In addition, a parameter optimization was achieved by means of a genetic algorithm to reach the maximum overall thermal efficiency. The results show that the thermal efficiency of the simple cycle increased with an increase in turbine expansion ratio and compressor inlet temperature. However, for the recompression cycle the thermal efficiency increased and then decreased as the turbine expansion ratio increased. Both the modified cycles with a bottoming cycle had higher performance, with thermal efficiency increase of 10.12 and 19.34% for combined recompression and simple configurations, respectively, in comparison to their original values. Furthermore, the values of exergy efficiency were 60.72 and 64.79% for the simple cycle and recompression cycle, respectively. The simple cycle and recompression cycle had a power ratio of 16.21 and 11.26%, respectively.
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Published In
Journal of Energy Engineering
Volume 142 • Issue 3 • September 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jan 27, 2015
Accepted: May 14, 2015
Published online: Jul 7, 2015
Discussion open until: Dec 7, 2015
Published in print: Sep 1, 2016
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