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Investigation of the Impact Factors on the Optimal Intermediate Temperature in a Dual Transcritical CO 2 System with a Dedicated Transcritical CO 2 Subcooler

Author

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  • Yulong Song

    (School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Haidan Wang

    (School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Feng Cao

    (School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

Abstract

As a natural fluid with superior environment advantages, CO 2 is used to constitute a dual transcritical system to reduce performance deterioration under high gas-cooler outlet temperature. Aiming at the system configuration, improvement potential, and optimization, the proposed system is deeply analyzed, and corresponding coupling models are presented in detail. First, the veracity of simulation models is completely verified by comparing with previous measurements. Then, the existence of the optimal intermediate temperature is validated, while the optimal values are found to increase with the augmentation in ambient and water-feed temperatures. Moreover, the negative effects of the pinch point on the heat transfer inside the gas cooler could be greatly reduced by using the dual gas cooler. Finally, a predictive correlation for optimal intermediate temperature determination with ambient and water-feed temperature as independent variables is proposed, which provides a theoretical basis for the proposed system to realize efficient control in the industrialization process.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:2:p:309-:d:306472
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    References listed on IDEAS

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    1. 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.
    2. Redón, A. & Navarro-Peris, E. & Pitarch, M. & Gonzálvez-Macia, J. & Corberán, J.M., 2014. "Analysis and optimization of subcritical two-stage vapor injection heat pump systems," Applied Energy, Elsevier, vol. 124(C), pages 231-240.
    3. Baek, Changhyun & Heo, Jaehyeok & Jung, Jongho & Cho, Honghyun & Kim, Yongchan, 2014. "Performance characteristics of a two-stage CO2 heat pump water heater adopting a sub-cooler vapor injection cycle at various operating conditions," Energy, Elsevier, vol. 77(C), pages 570-578.
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    1. Dai, Baomin & Liu, Xiao & Liu, Shengchun & Wang, Dabiao & Meng, Chenyang & Wang, Qi & Song, Yifan & Zou, Tonghua, 2022. "Life cycle performance evaluation of cascade-heating high temperature heat pump system for waste heat utilization: Energy consumption, emissions and financial analyses," Energy, Elsevier, vol. 261(PB).

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