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Energy and exergy analyses of a modified combined cooling, heating, and power system using supercritical CO2

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  • Xu, Xiao Xiao
  • Liu, Chao
  • Fu, Xiang
  • Gao, Hong
  • Li, Yourong

Abstract

In aim to reduce the greenhouse-gas emissions and improve the low-grade heat efficiency, a modified CCHP (combined cooling, heating, and power) system is proposed using supercritical CO2. This cycle combines a Brayton cycle and a transcritical ejector refrigeration cycle by adding an extraction turbine. A mathematical model is developed to simulate the modified CCHP system. Parametric analysis and exergy analysis are conducted to investigate the effects of key thermodynamic parameters on the performance and exergy destruction. Due to the difficulties in the thermal efficiency evaluation for CCHP system, a more practical performance metric is introduced in order to quantify system performance. The results indicate that both higher extraction rate and extraction pressure are helpful to gain more refrigeration. For the conditions considered, the exergy efficiency of the modified CCHP with the extraction turbine is higher than that of the CCHP with the no-extraction turbine from 10.4% to 22.5%. Furthermore, there is a large increase in the turbine power output and the exergy efficiency with increased turbine inlet temperature. It reveals that a rise of heat source quality benefits the system performance.

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  • Xu, Xiao Xiao & Liu, Chao & Fu, Xiang & Gao, Hong & Li, Yourong, 2015. "Energy and exergy analyses of a modified combined cooling, heating, and power system using supercritical CO2," Energy, Elsevier, vol. 86(C), pages 414-422.
    • Handle: RePEc:eee:energy:v:86:y:2015:i:c:p:414-422
    DOI: 10.1016/j.energy.2015.04.043
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    5. Ghaebi, Hadi & Parikhani, Towhid & Rostamzadeh, Hadi & Farhang, Behzad, 2017. "Thermodynamic and thermoeconomic analysis and optimization of a novel combined cooling and power (CCP) cycle by integrating of ejector refrigeration and Kalina cycles," Energy, Elsevier, vol. 139(C), pages 262-276.
    6. Ammar M. Bahman & Eckhard A. Groll, 2020. "Application of Second-Law Analysis for the Environmental Control Unit at High Ambient Temperature," Energies, MDPI, vol. 13(12), pages 1-20, June.
    7. Liu, Zhan & Liu, Zihui & Cao, Xing & Li, Hailong & Yang, Xiaohu, 2020. "Self-condensing transcritical CO2 cogeneration system with extraction turbine and ejector refrigeration cycle: A techno-economic assessment study," Energy, Elsevier, vol. 208(C).
    8. Briola, Stefano & Di Marco, Paolo & Gabbrielli, Roberto, 2017. "Thermodynamic sensitivity analysis of a novel trigeneration thermodynamic cycle with two-phase expanders and two-phase compressors," Energy, Elsevier, vol. 127(C), pages 335-350.
    9. Shi, Lingfeng & Tian, Hua & Shu, Gequn, 2020. "Multi-mode analysis of a CO2-based combined refrigeration and power cycle for engine waste heat recovery," Applied Energy, Elsevier, vol. 264(C).
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    11. Mosaffa, A.H. & Farshi, L. Garousi, 2018. "Thermodynamic and economic assessments of a novel CCHP cycle utilizing low-temperature heat sources for domestic applications," Renewable Energy, Elsevier, vol. 120(C), pages 134-150.
    12. Pan, Yu & Liu, Liuchen & Zhu, Tong & Zhang, Tao & Zhang, Junying, 2017. "Feasibility analysis on distributed energy system of Chongming County based on RETScreen software," Energy, Elsevier, vol. 130(C), pages 298-306.
    13. Kang, Ligai & Yang, Junhong & An, Qingsong & Deng, Shuai & Zhao, Jun & Wang, Hui & Li, Zelin, 2017. "Effects of load following operational strategy on CCHP system with an auxiliary ground source heat pump considering carbon tax and electricity feed in tariff," Applied Energy, Elsevier, vol. 194(C), pages 454-466.
    14. Li, Fenglei & Wu, Changzhi & Wang, Xiangyu & Tian, Qi & Teo, Kok Lay, 2016. "Sparsity-enhanced optimization for ejector performance prediction," Energy, Elsevier, vol. 113(C), pages 25-34.
    15. Liu, Xinxin & Xu, Xiaoxiao & Liu, Chao & Bai, Wanjin & Dang, Chaobin, 2018. "Heat transfer deterioration in helically coiled heat exchangers in trans-critical CO2 Rankine cycles," Energy, Elsevier, vol. 147(C), pages 1-14.
    16. Yang, Yiping & Huang, Yulei & Jiang, Peixue & Zhu, Yinhai, 2020. "Multi-objective optimization of combined cooling, heating, and power systems with supercritical CO2 recompression Brayton cycle," Applied Energy, Elsevier, vol. 271(C).
    17. Briola, Stefano & Gabbrielli, Roberto & Fino, Andrea & Bischi, Aldo & Di Marco, Paolo, 2019. "Working fluid selection and extensive sensitivity analysis for the thermodynamic optimization of a novel trigeneration cycle with two-phase expanders and compressors," Energy, Elsevier, vol. 179(C), pages 709-726.
    18. Qin, Lei & Xie, Gongnan & Ma, Yuan & Li, Shulei, 2023. "Thermodynamic analysis and multi-objective optimization of a waste heat recovery system with a combined supercritical/transcritical CO2 cycle," Energy, Elsevier, vol. 265(C).
    19. Wang, Zefeng & Han, Wei & Zhang, Na & Liu, Meng & Jin, Hongguang, 2017. "Exergy cost allocation method based on energy level (ECAEL) for a CCHP system," Energy, Elsevier, vol. 134(C), pages 240-247.
    20. Guo, Yumin & Guo, Xinru & Wang, Jiangfeng & Li, Zhanying & Cheng, Shangfang & Wang, Shunsen, 2024. "Comprehensive analysis and optimization for a novel combined heating and power system based on self-condensing transcritical CO2 Rankine cycle driven by geothermal energy from thermodynamic, exergoeco," Energy, Elsevier, vol. 300(C).
    21. He, Jintao & Zhang, Yonghao & Tian, Hua & Wang, Xuan & Li, Ligeng & Cai, Jinwen & Shi, Lingfeng & Shu, Gequn, 2022. "Dynamic performance of a multi-mode operation CO2-based system combining cooling and power generation," Applied Energy, Elsevier, vol. 312(C).
    22. He, Jintao & Shi, Lingfeng & Tian, Hua & Wang, Xuan & Zhang, Yonghao & Zhang, Meiyan & Yao, Yu & Cai, Jinwen & Shu, Gequn, 2022. "Control strategy for a CO2-based combined cooling and power generation system based on heat source and cold sink fluctuations," Energy, Elsevier, vol. 257(C).

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    Keywords

    CCHP; CO2; Transcritical cycle; Ejector; Exergy; Simulation;
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