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Thermodynamic assessment of a novel self-condensing sCO2 recompression system with vortex tube

Hakan Cetin, Tugberk; Zhu, Jie

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Authors

Tugberk Hakan Cetin



Abstract

Low temperature heat sink is required to condense the supercritical CO2 (sCO2) owing to its low critical temperature, this limits the sCO2 power system application. In this paper, a self-condensing sCO2 recompression system with vortex tube is proposed, which achieves the CO2 condensation without the low temperature heat sink and recompression near the critical point in order to improve the system energy and exergy efficiencies. The system performance is investigated from the first and second laws of thermodynamics point of view, and parametric study is conducted to clarify the influences of key design and operation parameters, including the mass flow rate split ratio, the minimum and maximum pressures and temperatures. In a base case scenario with 100 kW power output, the system energy and exergy efficiencies reach 35.50 % and 58.21 % respectively. In the optimum operating condition, the system has the ability to provide 129.80 kW power output with the maximum energy efficiency of 41.90 % and exergy efficiency of 60.89 %.

Citation

Hakan Cetin, T., & Zhu, J. (2022). Thermodynamic assessment of a novel self-condensing sCO2 recompression system with vortex tube. Energy Conversion and Management, 269, Article 116110. https://doi.org/10.1016/j.enconman.2022.116110

Journal Article Type Article
Acceptance Date Aug 7, 2022
Online Publication Date Aug 13, 2022
Publication Date Oct 1, 2022
Deposit Date Aug 31, 2022
Publicly Available Date Mar 28, 2024
Journal Energy Conversion and Management
Print ISSN 0196-8904
Publisher Elsevier BV
Peer Reviewed Peer Reviewed
Volume 269
Article Number 116110
DOI https://doi.org/10.1016/j.enconman.2022.116110
Keywords Energy Engineering and Power Technology; Fuel Technology; Nuclear Energy and Engineering; Renewable Energy, Sustainability and the Environment
Public URL https://nottingham-repository.worktribe.com/output/10632665
Publisher URL https://www.sciencedirect.com/science/article/pii/S0196890422008950?via%3Dihub

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