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Advanced Exergy and Exergoeconomic Analysis of Cascade High-Temperature Heat Pump System for Recovery of Low-Temperature Waste Heat

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Listed:
  • Xiaowei Hu

    (School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China)

  • Chenyang Shi

    (School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China)

  • Yong Liu

    (School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China)

  • Xingyu Fu

    (School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China)

  • Tianyao Ma

    (School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China)

  • Mingsen Jin

    (School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China)

Abstract

Cascade high-temperature heat pumps (CHTHPs) are often applied to recover low-temperature industrial waste heat owing to their large temperature lift. Through a comprehensive consideration of thermodynamic and economic performance, conventional and advanced exergy and exergoeconomic analyses are employed in this study to evaluate the potential for the improvement in CHTHP systems. The results show that the avoidable endogenous exergy destruction in a CHTHP system accounts for 62.26% of its total exergy destruction, indicating that most of the exergy destruction comes from the components. This suggests that CHTHP systems still have significant potential for improvement. The very low exergoeconomic factor of the total system (only 0.75%) implies that the exergy destruction cost has a great influence on the economic performance of a CHTHP system. The high- and low-temperature compressors are the two components with the highest exergy destruction, accounting for 34.14% and 26.79% of the total exergy destruction in the system, respectively. Moreover, their exergy destruction cost is much larger than that of the other components. Thus, the priorities for improvement should be the high- and low-temperature compressors. The decrease in exergy destruction in compressors produces a reduction in carbon emissions. This comprehensive analysis of thermodynamic and economic performance supplies guidance for the engineering application of CHTHPs in low-temperature waste heat recovery.

Suggested Citation

  • Xiaowei Hu & Chenyang Shi & Yong Liu & Xingyu Fu & Tianyao Ma & Mingsen Jin, 2024. "Advanced Exergy and Exergoeconomic Analysis of Cascade High-Temperature Heat Pump System for Recovery of Low-Temperature Waste Heat," Energies, MDPI, vol. 17(5), pages 1-17, February.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:5:p:1027-:d:1343727
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    1. Men, Yiyu & Liu, Xiaohua & Zhang, Tao, 2021. "A review of boiler waste heat recovery technologies in the medium-low temperature range," Energy, Elsevier, vol. 237(C).
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