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Performance Analysis of an Ejector-Enhanced Heat Pump System for Low-Temperature Waste Heat Recovery Using UHVDC Converter Valves

Author

Listed:
  • Menghan Jin

    (State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China)

  • Xingjuan Zhang

    (School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China)

  • Jianhui Zhou

    (State Key Lab of Advance Power Transmission Technology, Beijing 102299, China)

  • Limin Zhang

    (State Grid Shandong Electric Power Company Construction Company, Jinan 250118, China)

Abstract

This article proposes a heating method based on heat pump technology to address the large amount of low-grade waste heat generated by a certain type of ultra-high voltage direct current (UHVDC) converter valve. Thermal performance calculations for two systems, a basic vapor compression heat pump system (BVCHPS) based on thermal expansion valve throttling and an ejector-enhanced heat pump system (EEHPS) are analyzed. The research results show that the EEHPS exhibits superior COP and exergy efficiency when generating hot water above 80 °C using a heat source below 50 °C. Additionally, mathematical modeling analysis identifies optimal structural parameters such as nozzle throat diameter, throat area ratio, and nozzle outlet diameter for the ejector in its design state. The low-temperature waste heat recovered from the UHVDC converter valves can be further used in engineering applications such as heating, refrigeration, seawater desalination, and sewage treatment.

Suggested Citation

  • Menghan Jin & Xingjuan Zhang & Jianhui Zhou & Limin Zhang, 2024. "Performance Analysis of an Ejector-Enhanced Heat Pump System for Low-Temperature Waste Heat Recovery Using UHVDC Converter Valves," Energies, MDPI, vol. 17(14), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:14:p:3589-:d:1439779
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    References listed on IDEAS

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    1. Li, Huashan & Cao, Fei & Bu, Xianbiao & Wang, Lingbao & Wang, Xianlong, 2014. "Performance characteristics of R1234yf ejector-expansion refrigeration cycle," Applied Energy, Elsevier, vol. 121(C), pages 96-103.
    2. Chua, K.J. & Chou, S.K. & Yang, W.M., 2010. "Advances in heat pump systems: A review," Applied Energy, Elsevier, vol. 87(12), pages 3611-3624, December.
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