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Thermodynamic Analysis of a Cogeneration System Combined with Heat, Cold, and Electricity Based on the Supercritical CO 2 Power Cycle

Author

Listed:
  • Rujun Zhang

    (School of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, China)

  • Xiaohe Wang

    (School of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, China)

  • Shuang Yang

    (School of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, China)

  • Xin Shen

    (School of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, China)

Abstract

The supercritical CO 2 power cycle driven by solar as a new generation of solar thermal power generation technology has drawn significant attention worldwide. In this paper, a cogeneration system derived from a supercritical CO 2 recompression Brayton cycle is proposed, by considering the recovery of waste heat from the turbine outlet. The absorption refrigeration cycle is powered by the medium-temperature waste heat from the turbine outlet, while the low-temperature waste heat is employed for heating, achieving the cascaded utilization of the heat from the turbine outlet. As for the proposed combined cooling, heating, and power (CCHP) system, a dynamic model was built and verified in MATLAB R2021b/Simulink. Under design conditions, values for the energy utilization factor ( EUF ) and exergy efficiency of the cogeneration system were obtained. Moreover, the thermodynamic performances of the system were investigated in variable cooling/heating load and irradiation conditions. Compared with the reference system, it is indicated that the energy utilization factor ( EUF ) and exergy efficiency are 84.7% and 64.8%, which are improved by 11.5% and 10.3%. The proposed supercritical CO 2 CCHP system offers an effective solution for the efficient utilization of solar energy.

Suggested Citation

  • Rujun Zhang & Xiaohe Wang & Shuang Yang & Xin Shen, 2024. "Thermodynamic Analysis of a Cogeneration System Combined with Heat, Cold, and Electricity Based on the Supercritical CO 2 Power Cycle," Energies, MDPI, vol. 17(7), pages 1-20, April.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:7:p:1767-:d:1371552
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    References listed on IDEAS

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