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<p>CO<sub>2</sub> refrigeration system has been regarded as a highly promising refrigeration technology can. However, the low coefficient of performance of transcritical CO<sub>2</sub> cycle under high ambient temperature is a challenge. To address this problem, this study proposes an ejector heat recover CO<sub>2</sub> refrigeration system (EHRCRS) to enhance performance. The performance of the proposed system is evaluated by using the developed thermodynamic model from the viewpoint of energy and exergy. The impact of internal heat exchanger (IHX) on the system is investigated in detail through parametric comparative analysis. Results show that EHRCRS achieves highest COP at optimal generation temperatures and discharge pressures simultaneously. After adding IHX, the optimal generation temperature of EHRCRS is raised due to the increasing of the available recovery heat. At ambient temperatures of 30–45&#xa0;°C, EHRCRS exhibits COP<sub>max</sub> improvements of 1.52–6.32%. Different refrigerants in the ejector subcooling cycle have little impact on the overall performance of the EHRCRS but influence ejector entrainment ratios. The exergy efficiency of the system with IHX can be improved by 1.67–6.33%. This paper can be beneficial for the high efficiency configuration of CO<sub>2</sub> refrigeration cycle.</p>

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Effects of the internal heat exchanger on performance of transcritical CO2 refrigeration system integrated with heat-driven ejector subcooling system

  • 期刊论文

  • 发表日期：

    2026年1月31日

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  • Jie Lv,
  • Wenting Zhang,
  • Qichao Yang,
  • Yuanyang Zhao,
  • Guangbin Liu,
  • Liansheng Li

摘要

CO2 refrigeration system has been regarded as a highly promising refrigeration technology can. However, the low coefficient of performance of transcritical CO2 cycle under high ambient temperature is a challenge. To address this problem, this study proposes an ejector heat recover CO2 refrigeration system (EHRCRS) to enhance performance. The performance of the proposed system is evaluated by using the developed thermodynamic model from the viewpoint of energy and exergy. The impact of internal heat exchanger (IHX) on the system is investigated in detail through parametric comparative analysis. Results show that EHRCRS achieves highest COP at optimal generation temperatures and discharge pressures simultaneously. After adding IHX, the optimal generation temperature of EHRCRS is raised due to the increasing of the available recovery heat. At ambient temperatures of 30–45 °C, EHRCRS exhibits COPmax improvements of 1.52–6.32%. Different refrigerants in the ejector subcooling cycle have little impact on the overall performance of the EHRCRS but influence ejector entrainment ratios. The exergy efficiency of the system with IHX can be improved by 1.67–6.33%. This paper can be beneficial for the high efficiency configuration of CO2 refrigeration cycle.