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A modified recompression S–CO2 Brayton cycle and its thermodynamic optimization

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  • Jin, Qinglong
  • Xia, Shaojun
  • Chen, Lingen

Abstract

A modified recompression S–CO2 Brayton cycle (RCSCBC) that combines advantages of the preheated S–CO2 Brayton cycle (PSCBC) is proposed to recovery the gas turbine waste heat. The modified RCSCBC cycle model considers finite temperature difference heat transfer between heat reservoir and working fluid, irreversible compression, irreversible expansion and other irreversibility losses. It is established by using finite time thermodynamics. Influences of various parameters on net power output (NPO) and thermal efficiency (TEF) of the cycle are analyzed. Performances of the modified RCSCBC are compared with those of the unmodified RCSCBC and the PSCBC. Performance optimizations are performed by optimizing diversion coefficients and heat conductance distributions among heat exchanges. The results show that the first diversion coefficient is the main factor affecting TEF, and there are optimal first diversion coefficient and pressure ratio to maximize the cycle TEF; the second diversion coefficient is the main factor affecting the NPO, and there is an optimal second diversion coefficient to maximize the NPO. Compared with unmodified RCSCBC, NPO of the modified RCSCBC can be increased by 14.34%, and TEF can be increased by 10.89%. Compared with PSCBC, NPO can be increased by 14.20%, and TEF can be increased by 16.60%.

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  • Jin, Qinglong & Xia, Shaojun & Chen, Lingen, 2023. "A modified recompression S–CO2 Brayton cycle and its thermodynamic optimization," Energy, Elsevier, vol. 263(PE).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pe:s0360544222029012
    DOI: 10.1016/j.energy.2022.126015
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    References listed on IDEAS

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    Cited by:

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    3. Yu, Mingzhe & Yang, Fubin & Zhang, Hongguang & Yan, Yinlian & Ping, Xu & Pan, Yachao & Xing, Chengda & Yang, Anren, 2024. "Thermoeconomic performance of supercritical carbon dioxide Brayton cycle systems for CNG engine waste heat recovery," Energy, Elsevier, vol. 289(C).
    4. Chen, Lingen & Shi, Shuangshuang & Ge, Yanlin & Feng, Huijun, 2023. "Power density performances and multi-objective optimizations for an irreversible Otto cycle with five specific heat models of working fluid," Energy, Elsevier, vol. 282(C).
    5. Cheng, Kunlin & Li, Jiahui & Yu, Jianchi & Fu, Chuanjie & Qin, Jiang & Jing, Wuxing, 2023. "Novel thermoelectric generator enhanced supercritical carbon dioxide closed-Brayton-cycle power generation systems: Performance comparison and configuration optimization," Energy, Elsevier, vol. 284(C).
    6. Chen, Lingen & Lorenzini, Giulio, 2023. "Heating load, COP and exergetic efficiency optimizations for TEG-TEH combined thermoelectric device with Thomson effect and external heat transfer," Energy, Elsevier, vol. 270(C).
    7. Ge, Yanlin & Wu, Heng & Chen, Lingen & Feng, Huijun & Xie, Zhihui, 2023. "Finite time and finite speed thermodynamic optimization for an irreversible Atkinson cycle," Energy, Elsevier, vol. 270(C).

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