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Integrated solar thermal Brayton cycles with either one or two regenerative heat exchangers for maximum power output

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  • Jansen, E.
  • Bello-Ochende, T.
  • Meyer, J.P.

Abstract

The main objective of this paper is to optimise the open-air solar-thermal Brayton cycle by considering the implementation of the second law of thermodynamics and how it relates to the design of the heat exchanging components within it. These components included one or more regenerators (in the form of cross-flow heat exchangers) and the receiver of a parabolic dish concentrator where the system heat was absorbed. The generation of entropy was considered as it was associated with the destruction of exergy or available work. The dimensions of some components were used to optimise the cycles under investigation. EGM (Entropy Generation Minimisation) was employed to optimise the system parameters by considering their influence on the total generation of entropy (destruction of exergy). Various assumptions and constraints were considered and discussed. The total entropy generation rate and irreversibilities were determined by considering the individual components and ducts of the system, as well as their respective inlet and outlet conditions. The major system parameters were evaluated as functions of the mass flow rate to allow for a proper discussion of the system performance. The performances of both systems were investigated, and characteristics were listed for both. Finally, a comparison is made to shed light on the differences in performance.

Suggested Citation

  • Jansen, E. & Bello-Ochende, T. & Meyer, J.P., 2015. "Integrated solar thermal Brayton cycles with either one or two regenerative heat exchangers for maximum power output," Energy, Elsevier, vol. 86(C), pages 737-748.
    • Handle: RePEc:eee:energy:v:86:y:2015:i:c:p:737-748
    DOI: 10.1016/j.energy.2015.04.080
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    References listed on IDEAS

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    1. Singh, Narendra & Kaushik, S.C. & Misra, R.D., 2000. "Exergetic analysis of a solar thermal power system," Renewable Energy, Elsevier, vol. 19(1), pages 135-143.
    2. Agudelo, Andrés & Cortés, Cristóbal, 2010. "Thermal radiation and the second law," Energy, Elsevier, vol. 35(2), pages 679-691.
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    Cited by:

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    3. Daabo, Ahmed M. & Mahmoud, Saad & Al-Dadah, Raya K. & Ahmad, Abdalqader, 2017. "Numerical investigation of pitch value on thermal performance of solar receiver for solar powered Brayton cycle application," Energy, Elsevier, vol. 119(C), pages 523-539.
    4. Rovense, F. & Reyes-Belmonte, M.A. & González-Aguilar, J. & Amelio, M. & Bova, S. & Romero, M., 2019. "Flexible electricity dispatch for CSP plant using un-fired closed air Brayton cycle with particles based thermal energy storage system," Energy, Elsevier, vol. 173(C), pages 971-984.
    5. Daabo, Ahmed M. & Mahmoud, Saad & Al-Dadah, Raya K., 2016. "The effect of receiver geometry on the optical performance of a small-scale solar cavity receiver for parabolic dish applications," Energy, Elsevier, vol. 114(C), pages 513-525.
    6. Chenqi Tang & Lingen Chen & Huijun Feng & Wenhua Wang & Yanlin Ge, 2020. "Power Optimization of a Modified Closed Binary Brayton Cycle with Two Isothermal Heating Processes and Coupled to Variable-Temperature Reservoirs," Energies, MDPI, vol. 13(12), pages 1-21, June.

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