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Theoretical, experimental, and numerical methods to predict the best efficiency point of centrifugal pump as turbine

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  • Lin, Tong
  • Zhu, Zuchao
  • Li, Xiaojun
  • Li, Jian
  • Lin, Yanpi

Abstract

The best efficiency point prediction of the pump as turbine (PAT) is one of the key issues for its application. In the present paper, a theoretical method based on the impeller-volute matching principle was proposed to predict the best efficiency point of PAT and validated by three centrifugal pumps with specific speeds from 58.7 to 129.6 with an error of less than 5%. In the next step, a single-stage centrifugal pump with specific speed of 90 under normal rotation speed was investigated by experiment and the best efficiency point for pump and turbine modes were obtained. The experimental results of the head and discharge conversion factors and the predicted results obtained through theoretical or statistical methods were compared to verify further the effectiveness of the method proposed in this paper. The performance curves of the pump and turbine modes were predicted using numerical methods and verified by experiment. The hydraulic loss of the main components was calculated to obtain a deeper understanding of the variations of best efficiency point of PAT under different rotation speeds. Finally, the best efficiency point of PAT under different rotation speeds predicted by the theoretical and statistical methods was compared with the numerical results.

Suggested Citation

  • Lin, Tong & Zhu, Zuchao & Li, Xiaojun & Li, Jian & Lin, Yanpi, 2021. "Theoretical, experimental, and numerical methods to predict the best efficiency point of centrifugal pump as turbine," Renewable Energy, Elsevier, vol. 168(C), pages 31-44.
    • Handle: RePEc:eee:renene:v:168:y:2021:i:c:p:31-44
    DOI: 10.1016/j.renene.2020.12.040
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    References listed on IDEAS

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    Cited by:

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    2. Shojaeefard, Mohammad Hassan & Saremian, Salman, 2023. "Studying the impact of impeller geometrical parameters on the high-efficiency working range of pump as turbine (PAT) installed in the water distribution network," Renewable Energy, Elsevier, vol. 216(C).
    3. Balacco, Gabriella & Fiorese, Gaetano Daniele & Alfio, Maria Rosaria & Totaro, Vincenzo & Binetti, Mario & Torresi, Marco & Stefanizzi, Michele, 2023. "PaT-ID: A tool for the selection of the optimal pump as turbine for a water distribution network," Energy, Elsevier, vol. 282(C).
    4. Stefanizzi, M. & Filannino, D. & Capurso, T. & Camporeale, S.M. & Torresi, M., 2023. "Optimal hydraulic energy harvesting strategy for PaT installation in Water Distribution Networks," Applied Energy, Elsevier, vol. 344(C).
    5. Yao, Yao & Shen, Zhicheng & Wang, Qiliang & Du, Jiyun & Lu, Lin & Yang, Hongxing, 2023. "Development of an inline bidirectional micro crossflow turbine for hydropower harvesting from water supply pipelines," Applied Energy, Elsevier, vol. 329(C).
    6. Wang, Wenjie & Guo, Hailong & Zhang, Chenying & Shen, Jiawei & Pei, Ji & Yuan, Shouqi, 2023. "Transient characteristics of PAT in micro pumped hydro energy storage during abnormal shutdown process," Renewable Energy, Elsevier, vol. 209(C), pages 401-412.
    7. Xu, Zhe & Zheng, Yuan & Kan, Kan & Chen, Huixiang, 2023. "Flow instability and energy performance of a coastal axial-flow pump as turbine under the influence of upstream waves," Energy, Elsevier, vol. 272(C).
    8. Wang, Tao & Xiang, Ru & Yu, He & Zhou, Min, 2023. "Performance improvement of forward-curved impeller with an adequate outlet swirl using in centrifugal pump as turbine," Renewable Energy, Elsevier, vol. 204(C), pages 67-76.
    9. Nishi, Yasuyuki & Itoh, Natsumi & Fukutomi, Junichiro, 2022. "Performance and radial thrust of single-blade reverse running pump turbine," Renewable Energy, Elsevier, vol. 201(P1), pages 499-513.

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