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Energetic performance of transcritical CO2 refrigeration cycles with mechanical subcooling using zeotropic mixture as refrigerant

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  • Dai, Baomin
  • Liu, Shengchun
  • Li, Hailong
  • Sun, Zhili
  • Song, Mengjie
  • Yang, Qianru
  • Ma, Yitai

Abstract

Transcritical CO2 refrigeration cycle integrated with mechanical subcooling (MS) cycle operating with zeotropic mixture is proposed in this study, based on the concept of Lorenz cycle. An energetic model is developed and analyses are conducted in detail. A maximum overall coefficient of performance (COP) is achieved at the optimum discharge pressure and optimum subcooling degree. The maximum overall COP, optimum subcooling degree and discharge pressure are closely related to the temperature glide of the mixtures. The energy efficiency of the transcritical CO2 refrigeration cycle can be efficiently improved, and the high pressure can be reduced when mixtures with proper temperature glide are used as MS cycle refrigerant. Compared with pure R32, the overall COP is enhanced by 4.91%, and the discharge pressure decreases by 0.11 MPa at evaporation temperature of −5 °C and ambient temperature of 35 °C when R32/R1234ze(Z) (55/45) is employed as MS refrigerant. The mixtures with proper temperature glide are recommended. The thermal performance of the overall cycle can be enhanced more significantly for hot and warm climate regions, or relative low evaporation temperature applications, though a high subcooling degree is required to meet the optimum operation condition.

Suggested Citation

  • Dai, Baomin & Liu, Shengchun & Li, Hailong & Sun, Zhili & Song, Mengjie & Yang, Qianru & Ma, Yitai, 2018. "Energetic performance of transcritical CO2 refrigeration cycles with mechanical subcooling using zeotropic mixture as refrigerant," Energy, Elsevier, vol. 150(C), pages 205-221.
    • Handle: RePEc:eee:energy:v:150:y:2018:i:c:p:205-221
    DOI: 10.1016/j.energy.2018.02.111
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    References listed on IDEAS

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    1. Dai, Baomin & Li, Minxia & Ma, Yitai, 2014. "Thermodynamic analysis of carbon dioxide blends with low GWP (global warming potential) working fluids-based transcritical Rankine cycles for low-grade heat energy recovery," Energy, Elsevier, vol. 64(C), pages 942-952.
    2. Dai, Baomin & Liu, Shengchun & Zhu, Kai & Sun, Zhili & Ma, Yitai, 2017. "Thermodynamic performance evaluation of transcritical carbon dioxide refrigeration cycle integrated with thermoelectric subcooler and expander," Energy, Elsevier, vol. 122(C), pages 787-800.
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    1. Benlin Shi & Muqing Chen & Weikai Chi & Qichao Yang & Guangbin Liu & Yuanyang Zhao & Liansheng Li, 2022. "Effects of Internal Heat Exchanger on Two-Stage Compression Trans-Critical CO 2 Refrigeration Cycle Combined with Expander and Intercooling," Energies, MDPI, vol. 16(1), pages 1-16, December.
    2. Laura Nebot-Andrés & Daniel Calleja-Anta & Daniel Sánchez & Ramón Cabello & Rodrigo Llopis, 2019. "Thermodynamic Analysis of a CO 2 Refrigeration Cycle with Integrated Mechanical Subcooling," Energies, MDPI, vol. 13(1), pages 1-17, December.
    3. Guruchethan, A.M. & Reddy, Y. Siva Kumar & Maiya, M.P. & Hafner, Armin, 2024. "Experimental investigation of multi-ejector CO2 heat pump system with and without IHX," Energy, Elsevier, vol. 297(C).
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    5. Zendehboudi, Alireza, 2024. "Energy, exergy, and exergoeconomic analyses of an air source transcritical CO2 heat pump for simultaneous domestic hot water and space heating," Energy, Elsevier, vol. 290(C).
    6. Yilmaz, Tuncay & Erdinç, Mehmet Tahir, 2019. "Energetic and exergetic investigation of a novel refrigeration system utilizing ejector integrated subcooling using different refrigerants," Energy, Elsevier, vol. 168(C), pages 712-727.
    7. Yulong Song & Haidan Wang & Feng Cao, 2020. "Investigation of the Impact Factors on the Optimal Intermediate Temperature in a Dual Transcritical CO 2 System with a Dedicated Transcritical CO 2 Subcooler," Energies, MDPI, vol. 13(2), pages 1-23, January.
    8. Zhihua Wang & Yujia Zhang & Fenghao Wang & Guichen Li & Kaiwen Xu, 2021. "Performance Optimization and Economic Evaluation of CO 2 Heat Pump Heating System Coupled with Thermal Energy Storage," Sustainability, MDPI, vol. 13(24), pages 1-22, December.
    9. Zendehboudi, Alireza, 2024. "Optimal discharge pressure and performance characteristics of a transcritical CO2 heat pump system with a tri-partite gas cooler for combined space and water heating," Renewable Energy, Elsevier, vol. 226(C).
    10. Daniel Sánchez & Jesús Catalán-Gil & Ramón Cabello & Daniel Calleja-Anta & Rodrigo Llopis & Laura Nebot-Andrés, 2020. "Experimental Analysis and Optimization of an R744 Transcritical Cycle Working with a Mechanical Subcooling System," Energies, MDPI, vol. 13(12), pages 1-27, June.
    11. Xu, Weicong & Zhao, Ruikai & Deng, Shuai & Zhao, Li & Mao, Samuel S., 2021. "Is zeotropic working fluid a promising option for organic Rankine cycle: A quantitative evaluation based on literature data," Renewable and Sustainable Energy Reviews, Elsevier, vol. 148(C).
    12. Liu, Shengchun & Lu, Fenping & Dai, Baomin & Nian, Victor & Li, Hailong & Qi, Haifeng & Li, Jiayu, 2019. "Performance analysis of two-stage compression transcritical CO2 refrigeration system with R290 mechanical subcooling unit," Energy, Elsevier, vol. 189(C).
    13. Artur Bieniek & Jan Kuchmacz & Karol Sztekler & Lukasz Mika & Ewelina Radomska, 2021. "A New Method of Regulating the Cooling Capacity of a Cooling System with CO 2," Energies, MDPI, vol. 14(7), pages 1-18, March.
    14. Liu, Bo & Guo, Xiangji & Xi, Xiuzhi & Sun, Jianhua & Zhang, Bo & Yang, Zhuqiang, 2023. "Thermodynamic analyses of ejector refrigeration cycle with zeotropic mixture," Energy, Elsevier, vol. 263(PD).
    15. Li, Jiaojiao & Zoghi, Mohammad & Zhao, Linfeng, 2022. "Thermo-economic assessment and optimization of a geothermal-driven tri-generation system for power, cooling, and hydrogen production," Energy, Elsevier, vol. 244(PB).

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