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In the supercritical carbon dioxide SCO2 Brayton simple recuperative cycle, due to the significant variations in the physical properties of SCO2 with temperature and pressure, the minimum temperature difference points between the hot and cold sides of the recuperator and precooler may occur inside the heat exchangers, which is known as the pinch point problem of heat exchangers. This study is based on the current cycle design parameters, deeply analyzes the pinch point problem. It proposes the causes and determination methods of pinch points in the recuperator and cooler, and comprehensively analyzes its impacts on heat exchanger design and the cycle system in combination with pinch point characteristics. The conclusions can provide valuable guidance for the design of the SCO2 Brayton cycle system and heat exchangers.

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Study on Pinch Point Problem of Supercritical Carbon Dioxide Brayton Simple Regenerative Cycle

  • 会议论文

  • 发表日期：

    2026年

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  • Jingsong Li,
  • Tianqing Zhang,
  • Zijian Wang,
  • Wei Zhang

摘要

In the supercritical carbon dioxide SCO2 Brayton simple recuperative cycle, due to the significant variations in the physical properties of SCO2 with temperature and pressure, the minimum temperature difference points between the hot and cold sides of the recuperator and precooler may occur inside the heat exchangers, which is known as the pinch point problem of heat exchangers. This study is based on the current cycle design parameters, deeply analyzes the pinch point problem. It proposes the causes and determination methods of pinch points in the recuperator and cooler, and comprehensively analyzes its impacts on heat exchanger design and the cycle system in combination with pinch point characteristics. The conclusions can provide valuable guidance for the design of the SCO2 Brayton cycle system and heat exchangers.