Technical Papers
Nov 8, 2021

Thermodynamic, Economic Analysis, and Multiobjective Optimization of a Novel Transcritical CO2 Rankine Cycle with a Vortex Tube

Publication: Journal of Energy Engineering
Volume 148, Issue 1

Abstract

The transcritical CO2 (TCO2) Rankine cycle has been receiving more and more attention for the lower irreversible losses and the excellent thermophysical characters of CO2. However, it is hard to condense CO2 to liquid due to its low critical temperature (about 31°C) under ambient conditions. In this paper, a novel transcritical CO2 Rankine cycle called TCO2 is proposed, in which a vortex tube is added to condense CO2 under ambient conditions. A mathematical model is established to analyze the parametric effects on thermodynamic and economic performance based on specific equipment investment cost; the model is verified with experimental data. Nondominated sorting genetic algorithm II is used to achieve multiobjective system optimization for obtaining optimum cycle performance. Parametric analysis results show that an increase turbine inlet temperature and vortex tube outlet pressure can increase exergy efficiency. A decrease in turbine inlet pressure and turbine inlet temperature can reduce the TCO2 cycle equipment investment cost. In addition, multiobjective optimization results indicate that a conflict exists between TCO2 cycle thermodynamic and economic performance based on specific equipment investment cost.

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Data Availability Statement

All data, models, and code generated or used during the study appear in the published article.

Acknowledgments

The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (Grant No. 51976147) and the Outstanding Youth Science Fund of Shaanxi Province (Grant No. 2021JC-05).

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Go to Journal of Energy Engineering
Journal of Energy Engineering
Volume 148Issue 1February 2022

History

Received: Mar 16, 2021
Accepted: Sep 9, 2021
Published online: Nov 8, 2021
Published in print: Feb 1, 2022
Discussion open until: Apr 8, 2022

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Authors

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Jiangfeng Wang [email protected]
Professor, School of Energy and Power Engineering, Xi’an Jiaotong Univ., Xi’an, Shaanxi 710049, PR China (corresponding author). Email: [email protected]
Guanglin Liao
Master, School of Energy and Power Engineering, Xi’an Jiaotong Univ., Xi’an, Shaanxi 710049, PR China.
Qiyao Zuo
Master, School of Energy and Power Engineering, Xi’an Jiaotong Univ., Xi’an, Shaanxi 710049, PR China.
Yumin Guo
Ph.D. Candidate, School of Energy and Power Engineering, Xi’an Jiaotong Univ., Xi’an, Shaanxi 710049, PR China.
Pan Zhao
Associate Professor, School of Energy and Power Engineering, Xi’an Jiaotong Univ., Xi’an, Shaanxi 710049, PR China.
Yiping Dai
Professor, School of Energy and Power Engineering, Xi’an Jiaotong Univ., Xi’an, Shaanxi 710049, PR China.

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  • Thermodynamic assessment of a novel self-condensing sCO2 recompression system with vortex tube, Energy Conversion and Management, 10.1016/j.enconman.2022.116110, 269, (116110), (2022).

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