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Exergetic analysis of supercritical CO2 Brayton cycles integrated with solar central receivers

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  • Padilla, Ricardo Vasquez
  • Soo Too, Yen Chean
  • Benito, Regano
  • Stein, Wes

Abstract

Concentrated Solar Power (CSP) is a promising alternative for generating renewable energy. One of the most prominent CSP technologies is the central receiver tower with heliostat field, which has received attention in the last decade due to its high achievable temperatures and potential cost reduction. In order to make this technology economically viable, research has been focused on the solar field, solar receiver, energy storage and power block. The power block is one of the important components since improving system efficiency leads to reductions in the storage, solar field and receiver sizes and costs. Recently, supercritical CO2 Brayton cycles have emerged as an alternative for power block with central receiver tower systems due to higher thermal efficiencies and compactness compared to traditional steam Rankine cycles. In this paper, detailed energy and exergy analysis of four different supercritical CO2 Brayton cycle configurations (Simple Brayton cycle, Recompression Brayton cycle, Partial cooling with recompression and Recompression with main compression intercooling) were performed with and without reheat. Prior the compressor inlet, dry air cooler is used for all supercritical Brayton cycles studied in this paper. A solar receiver, replacing the heater and reheater for conventional Brayton cycles, is also used to provide heat input to the cycles. The simulations were carried out for Alice Springs (Australia) solar conditions and optimum operating conditions of the supercritical cycle were obtained by optimising the first law thermodynamic efficiency.

Suggested Citation

  • Padilla, Ricardo Vasquez & Soo Too, Yen Chean & Benito, Regano & Stein, Wes, 2015. "Exergetic analysis of supercritical CO2 Brayton cycles integrated with solar central receivers," Applied Energy, Elsevier, vol. 148(C), pages 348-365.
    • Handle: RePEc:eee:appene:v:148:y:2015:i:c:p:348-365
    DOI: 10.1016/j.apenergy.2015.03.090
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