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Modified Affinity Laws in Hydraulic Machines towards the Best Efficiency Line

Author

Listed:
  • Modesto Pérez-Sánchez

    (Universitat Politècnica de València)

  • P. Amparo López-Jiménez

    (Universitat Politècnica de València)

  • Helena M. Ramos

    (Universidade de Lisboa)

Abstract

The development of hydraulic and optimization models in water networks analyses to improve the sustainability and efficiency through the installation of micro or pico hydropower is swelling. Hydraulic machines involved in these models have to operate with different rotational speed, in order that in each instant to maximize the recovered energy. When the changes of rotational speed are determined using affinity laws, the errors can be significant. Detailed analyses are developed in this research through experimental tests to validate and propose new affinity laws in different reaction turbomachines. Once the errors have been analyzed, a methodology to modify the affinity laws is applied to radial and axial turbines. An empirical method to obtain the Best Efficiency Line (BEL) in proposed (i.e., based on all the Best Efficiency Points (BEPs) for different flows). When the experimental measurements and the calculated values by the empirical method are compared, the mean errors are reduced 81.81%, 50%, and 86.67% for flow, head, and efficiency parameters, respectively. The knowledge of BEL allows managers to define the operation rules to reach the BEP for each flow, improving the energy efficiency in the optimization strategies to be adopted.

Suggested Citation

  • Modesto Pérez-Sánchez & P. Amparo López-Jiménez & Helena M. Ramos, 2018. "Modified Affinity Laws in Hydraulic Machines towards the Best Efficiency Line," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 32(3), pages 829-844, February.
    • Handle: RePEc:spr:waterr:v:32:y:2018:i:3:d:10.1007_s11269-017-1841-0
    DOI: 10.1007/s11269-017-1841-0
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    References listed on IDEAS

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    2. Pérez-Sánchez, Modesto & Sánchez-Romero, Francisco Javier & López-Jiménez, P. Amparo & Ramos, Helena M., 2018. "PATs selection towards sustainability in irrigation networks: Simulated annealing as a water management tool," Renewable Energy, Elsevier, vol. 116(PA), pages 234-249.
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    8. Armando Carravetta & Giuseppe Del Giudice & Oreste Fecarotta & Helena Ramos, 2012. "Energy Production in Water Distribution Networks: A PAT Design Strategy," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 26(13), pages 3947-3959, October.
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    Cited by:

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    3. Tahani, Mojtaba & Kandi, Ali & Moghimi, Mahdi & Houreh, Shahram Derakhshan, 2020. "Rotational speed variation assessment of centrifugal pump-as-turbine as an energy utilization device under water distribution network condition," Energy, Elsevier, vol. 213(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. Ioan Sarbu & Matei Mirza & Daniel Muntean, 2022. "Integration of Renewable Energy Sources into Low-Temperature District Heating Systems: A Review," Energies, MDPI, vol. 15(18), pages 1-28, September.
    6. Frank A Plua & Francisco-Javier Sánchez-Romero & Victor Hidalgo & P. Amparo López-Jiménez & Modesto Pérez-Sánchez, 2021. "New Expressions to Apply the Variation Operation Strategy in Engineering Tools Using Pumps Working as Turbines," Mathematics, MDPI, vol. 9(8), pages 1-17, April.

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