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Optimized operation of recompression sCO2 Brayton cycle based on adjustable recompression fraction under variable conditions

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  • Correa, Faustino
  • Barraza, Rodrigo
  • Soo Too, Yen Chean
  • Vasquez Padilla, Ricardo
  • Cardemil, José M.

Abstract

The use of supercritical carbon dioxide (sCO2) cycle has been proposed as a promising alternative to replace conventional steam Rankine cycle. This study entails the development of a power cycle model to assess the impact of fluctuations on the heat source and environmental conditions on a recompression sCO2 Brayton cycle during off-design operation. Two operational strategies are tested during off-design operation, including fixed recompression fraction and adjusted recompression fraction. It is found that a superior performance is obtained when the recompression fraction is adjusted according to heat addition and ambient temperature variations. The variations of the heat addition have a greater impact than ambient temperature on the cycle’s performance, showing up to 70% greater cycle efficiency when the heat addition ratio is reduced to 30%. In some conditions, the recompression cycle operates similarly to a regenerative cycle, hence no recompression fraction is required when the heat addition ratio is lower than 55%. The influence of the ambient temperature is more relevant when a dry cooler is used, and in this case, it is important to include a detailed cooler’s model in order to account for the variability of the thermophysical properties of the carbon dioxide close to its critical point.

Suggested Citation

  • Correa, Faustino & Barraza, Rodrigo & Soo Too, Yen Chean & Vasquez Padilla, Ricardo & Cardemil, José M., 2021. "Optimized operation of recompression sCO2 Brayton cycle based on adjustable recompression fraction under variable conditions," Energy, Elsevier, vol. 227(C).
    • Handle: RePEc:eee:energy:v:227:y:2021:i:c:s0360544221005831
    DOI: 10.1016/j.energy.2021.120334
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    4. Felipe G. Battisti & Carlos F. Klein & Rodrigo A. Escobar & José M. Cardemil, 2023. "Exergy Analysis and Off-Design Modeling of a Solar-Driven Supercritical CO 2 Recompression Brayton Cycle," Energies, MDPI, vol. 16(12), pages 1-26, June.
    5. Muhammad, Hafiz Ali & Cho, Junhyun & Cho, Jongjae & Choi, Bongsu & Roh, Chulwoo & Ishfaq, Hafiz Ahmad & Lee, Gilbong & Shin, Hyungki & Baik, Young-Jin & Lee, Beomjoon, 2022. "Performance improvement of supercritical carbon dioxide power cycle at elevated heat sink temperatures," Energy, Elsevier, vol. 239(PD).
    6. du Sart, Colin Francois & Rousseau, Pieter & Laubscher, Ryno, 2024. "Comparing the partial cooling and recompression cycles for a 50 MWe sCO2 CSP plant using detailed recuperator models," Renewable Energy, Elsevier, vol. 222(C).
    7. Cheng, Kunlin & Xu, Jing & Dang, Chaolei & Qin, Jiang & Jing, Wuxing, 2022. "Performance evaluation of fuel indirect cooling based thermal management system using liquid metal for hydrocarbon-fueled scramjet," Energy, Elsevier, vol. 260(C).

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