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

Rujun Zhang, Xiaohe Wang (), Shuang Yang and Xin Shen
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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

Energies, 2024, vol. 17, issue 7, 1-20

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.

Keywords: supercritical CO 2 power cycle; CCHP system; thermodynamic analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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