Proposal and Thermodynamic Assessment of S-CO2 Brayton Cycle Layout for Improved Heat Recovery
Mechanical Engineering Department, King Abdulaziz University, Jeddah 21589, Saudi Arabia
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Entropy 2020, 22(3), 305; https://doi.org/10.3390/e22030305
Received: 11 February 2020
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Revised: 1 March 2020
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Accepted: 4 March 2020
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Published: 6 March 2020
This article deals with the thermodynamic assessment of supercritical carbon dioxide (S-CO2) Brayton power cycles. The main advantage of S-CO2 cycles is the capability of achieving higher efficiencies at significantly lower temperatures in comparison to conventional steam Rankine cycles. In the past decade, variety of configurations and layouts of S-CO2 cycles have been investigated targeting efficiency improvement. In this paper, four different layouts have been studied (with and without reheat): Simple Brayton cycle, Recompression Brayton cycle, Recompression Brayton cycle with partial cooling and the proposed layout called Recompression Brayton cycle with partial cooling and improved heat recovery (RBC-PC-IHR). Energetic and exergetic performances of all configurations were analyzed. Simple configuration is the least efficient due to poor heat recovery mechanism. RBC-PC-IHR layout achieved the best thermal performance in both reheat and no reheat configurations ( = 59.7% with reheat and = 58.2 without reheat at 850 °C), which was due to better heat recovery in comparison to other layouts. The detailed component-wise exergy analysis shows that the turbines and compressors have minimal contribution towards exergy destruction in comparison to what is lost by heat exchangers and heat source.
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Keywords:
S-CO2 Brayton cycle; exergy efficiency; irreversibility; thermal efficiency; improved heat recovery
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MDPI and ACS Style
Siddiqui, M.E.; Almitani, K.H. Proposal and Thermodynamic Assessment of S-CO2 Brayton Cycle Layout for Improved Heat Recovery. Entropy 2020, 22, 305. https://doi.org/10.3390/e22030305
AMA Style
Siddiqui ME, Almitani KH. Proposal and Thermodynamic Assessment of S-CO2 Brayton Cycle Layout for Improved Heat Recovery. Entropy. 2020; 22(3):305. https://doi.org/10.3390/e22030305
Chicago/Turabian StyleSiddiqui, Muhammad E., and Khalid H. Almitani. 2020. "Proposal and Thermodynamic Assessment of S-CO2 Brayton Cycle Layout for Improved Heat Recovery" Entropy 22, no. 3: 305. https://doi.org/10.3390/e22030305
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