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Thermodynamic analyses and optimization of a recompression N2O Brayton power cycle

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  • Sarkar, Jahar

Abstract

Thermodynamic analyses and simultaneous optimizations of cycle pressure ratio and flow split fraction to get maximum efficiency of N2O recompression Brayton cycle have been performed to study the effects of various operating conditions and component performances. The energetic as well as exergetic performance comparison with its counterpart recompression CO2 cycle is presented as well. Optimization shows that the optimum minimum cycle pressure is close to pseudo-critical pressure for supercritical cycle, whereas saturation pressure corresponding to minimum cycle temperature for condensation cycle. Results show that the maximum thermal efficiency increases with decrease in minimum cycle temperature and increase in both maximum cycle pressure and temperature. Influence of turbine performance on cycle efficiency is more compared to that of compressors, HTR (high temperature recuperator) and LTR (low temperature recuperator). Comparison shows that N2O gives better thermal efficiency (maximum deviation of 1.2%) as well as second law efficiency compared to CO2 for studied operating conditions. Component wise irreversibility distribution shows the similar trends for both working fluids. Present study reveals that N2O is a potential option for the recompression power cycle.

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  • Sarkar, Jahar, 2010. "Thermodynamic analyses and optimization of a recompression N2O Brayton power cycle," Energy, Elsevier, vol. 35(8), pages 3422-3428.
    • Handle: RePEc:eee:energy:v:35:y:2010:i:8:p:3422-3428
    DOI: 10.1016/j.energy.2010.04.035
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    References listed on IDEAS

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    1. Lior, Noam & Zhang, Na, 2007. "Energy, exergy, and Second Law performance criteria," Energy, Elsevier, vol. 32(4), pages 281-296.
    2. Sarkar, Jahar, 2009. "Second law analysis of supercritical CO2 recompression Brayton cycle," Energy, Elsevier, vol. 34(9), pages 1172-1178.
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    Cited by:

    1. Xinyu Miao & Haochun Zhang & Qi Wang & Wenbo Sun & Yan Xia, 2022. "Thermodynamic, Exergoeconomic and Multi-Objective Analyses of Supercritical N 2 O-He Recompression Brayton Cycle for a Nuclear Spacecraft Application," Energies, MDPI, vol. 15(21), pages 1-31, November.
    2. Sarkar, Jahar, 2015. "Analyses and optimization of a supercritical N2O Rankine cycle for low-grade heat conversion," Energy, Elsevier, vol. 81(C), pages 344-351.
    3. Le Roux, W.G. & Bello-Ochende, T. & Meyer, J.P., 2011. "Operating conditions of an open and direct solar thermal Brayton cycle with optimised cavity receiver and recuperator," Energy, Elsevier, vol. 36(10), pages 6027-6036.
    4. Miao, Xinyu & Zhang, Haochun & Sun, Wenbo & Wang, Qi & Zhang, Chenxu, 2022. "Optimization of a recompression supercritical nitrous oxide and helium Brayton cycle for space nuclear system," Energy, Elsevier, vol. 242(C).
    5. Battisti, Felipe G. & Cardemil, José M. & Miller, Francisco M. & da Silva, Alexandre K., 2015. "Normalized performance optimization of supercritical, CO2-based power cycles," Energy, Elsevier, vol. 82(C), pages 108-118.
    6. Le Roux, W.G. & Bello-Ochende, T. & Meyer, J.P., 2012. "Optimum performance of the small-scale open and direct solar thermal Brayton cycle at various environmental conditions and constraints," Energy, Elsevier, vol. 46(1), pages 42-50.

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