Key Factors, Degradation Mechanisms, and Optimization Strategies for SCO 2 Heat Transfer in Microchannels: A Review

Lianghui Guo, Ran Liu, Xiaoqin Xiong, Xinzhe Li, Aoxiang Yin, Runyao Han, Jiahao Zhang, Zhuoqian Liu and Keke Zhi ()
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Lianghui Guo: Department of Engineering, China University of Petroleum-Beijing at Karamay, Karamay 834000, China
Ran Liu: Department of Engineering, China University of Petroleum-Beijing at Karamay, Karamay 834000, China
Xiaoqin Xiong: Department of Engineering, China University of Petroleum-Beijing at Karamay, Karamay 834000, China
Xinzhe Li: Department of Engineering, China University of Petroleum-Beijing at Karamay, Karamay 834000, China
Aoxiang Yin: Department of Engineering, China University of Petroleum-Beijing at Karamay, Karamay 834000, China
Runyao Han: Department of Engineering, China University of Petroleum-Beijing at Karamay, Karamay 834000, China
Jiahao Zhang: Department of Engineering, China University of Petroleum-Beijing at Karamay, Karamay 834000, China
Zhuoqian Liu: Department of Engineering, China University of Petroleum-Beijing at Karamay, Karamay 834000, China
Keke Zhi: Department of Engineering, China University of Petroleum-Beijing at Karamay, Karamay 834000, China

Energies, 2025, vol. 18, issue 14, 1-26

Abstract: Despite a growing body of research on supercritical carbon dioxide (SCO 2 ) heat transfer in microchannels, comprehensive reviews remain scarce. Existing studies predominantly focus on isolated experiments or simulations, yielding inconsistent findings and lacking a unified theory or optimization framework. This review systematically consolidates recent SCO 2 microchannel heat transfer advancements, emphasizing key performance factors, degradation mechanisms, and optimization strategies. We critically analyze over 260 studies (1962–2024), evaluating the experimental and numerical methodologies, heat transfer deterioration (HTD) phenomena, and efficiency enhancement techniques. Key challenges include the complexity of heat transfer mechanisms, discrepancies in experimental outcomes, and the absence of standardized evaluation criteria. Future research directions involve refining predictive models, developing mitigation strategies for HTD, and optimizing microchannel geometries to enhance thermal performance. This work not only integrates the current knowledge but also provides actionable insights for advancing SCO 2 -based technologies in energy systems.

Keywords: supercritical carbon dioxide; microchannels; heat transfer degradation; thermophysical properties; optimization strategies (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: 2025
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