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A new theoretical model of steady-state characteristics of supercritical carbon dioxide natural circulation

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  • Liu, Guangxu
  • Huang, Yanping
  • Wang, Junfeng

Abstract

Due to its commendable thermal properties in the supercritical region, supercritical carbon dioxide shows great promise as the working fluid of the Brayton cycle, which could achieve remarkable higher efficiency compared with steam Rankine cycle. The steady-state characteristics are essential for the design of supercritical carbon dioxide power conversion system. In the present article, the steady-state characteristics of supercritical carbon dioxide natural circulation were theoretically and experimentally studied. An one-dimensional theoretical model of steady-state characteristics of supercritical carbon dioxide natural circulation was put forward, which was developed in an analytical form. So far as is known to the authors, no similar theoretical model has been carried out ever. Experiments on the steady-state characteristics of supercritical carbon dioxide natural circulation were performed. The influence of system pressure, inlet temperature and enthalpy difference on the steady-state characteristics was discussed in detail. Results indicated that the steady-state characteristics of supercritical carbon dioxide natural circulation were closely related to geometrical parameters as well as thermal properties at the pseudo-critical point. The new theoretical model was further validated with present experimental data and available experimental results from the open literature.

Suggested Citation

  • Liu, Guangxu & Huang, Yanping & Wang, Junfeng, 2019. "A new theoretical model of steady-state characteristics of supercritical carbon dioxide natural circulation," Energy, Elsevier, vol. 189(C).
    • Handle: RePEc:eee:energy:v:189:y:2019:i:c:s0360544219320183
    DOI: 10.1016/j.energy.2019.116323
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    References listed on IDEAS

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    1. Bai, Ziwei & Zhang, Guoqiang & Li, Yongyi & Xu, Gang & Yang, Yongping, 2018. "A supercritical CO2 Brayton cycle with a bleeding anabranch used in coal-fired power plants," Energy, Elsevier, vol. 142(C), pages 731-738.
    2. Liu, Guangxu & Huang, Yanping & Wang, Junfeng & Lv, Fa & Liu, Shenghui, 2017. "Experimental research and theoretical analysis of flow instability in supercritical carbon dioxide natural circulation loop," Applied Energy, Elsevier, vol. 205(C), pages 813-821.
    3. Kim, Young Min & Sohn, Jeong Lak & Yoon, Eui Soo, 2017. "Supercritical CO2 Rankine cycles for waste heat recovery from gas turbine," Energy, Elsevier, vol. 118(C), pages 893-905.
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    1. Luo, Qiao & Zhou, Yuan & Huang, Yanping & Huang, Jiajian & Hu, Wei & Yuan, Yuan & Tang, Longchang, 2023. "Multi-region oscillation characteristics and hazard of supercritical carbon dioxide in parallel channels natural circulation system," Energy, Elsevier, vol. 267(C).

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