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A Comparison of Power Take-Off Architectures for Wave-Powered Reverse Osmosis Desalination of Seawater with Co-Production of Electricity

Author

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  • Jeremy W. Simmons

    (Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA)

  • James D. Van de Ven

    (Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA)

Abstract

Several power take-off (PTO) architectures for wave-powered reverse osmosis (RO) desalination of seawater are introduced and compared based on the annual average freshwater production and the size of the components, which strongly relate to the costs of the system. The set of architectures compared includes a novel series-type PTO architecture not previously considered. These seawater hydraulic PTO architectures are composed of a WEC-driven pump, an RO module, an intake charge pump driven by an electric motor, and a hydraulic motor driving an electric generator for electric power production. This study is performed using an efficient two-way coupled steady-state model for the average performance of the system in a given sea state, including freshwater permeate production, electric power production, and electric power consumption. A multi-objective design problem is formulated for the purposes of this comparative study, with the objectives of maximizing annual freshwater production, minimizing the displacement of the WEC-driven pump, and minimizing the installed RO membrane area. This establishes a framework for comparison in the absence of a mature techno-economic model. The requirement that the system produces enough electric power to meet its consumption is applied as a constraint on the operation of the system. The oscillating wave surge converter Oyster 1 is assumed as the WEC. Weights on performance of the system in a given sea state are based on historical data from Humboldt Bay, CA. This study finds that (1) architectures in a series configuration allow for a reduction in the WEC-driven pump size of 59–92% compared to prior work, (2) varying the displacement of the WEC-driven pump between sea conditions does not provide any significant advantage in performance, and (3) varying the active RO membrane area between sea condition offers improvements between 7% and 41% in each design objective.

Suggested Citation

  • Jeremy W. Simmons & James D. Van de Ven, 2023. "A Comparison of Power Take-Off Architectures for Wave-Powered Reverse Osmosis Desalination of Seawater with Co-Production of Electricity," Energies, MDPI, vol. 16(21), pages 1-33, October.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:21:p:7381-:d:1272027
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    References listed on IDEAS

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    1. Schallenberg-Rodríguez, Julieta & Del Rio-Gamero, Beatriz & Melian-Martel, Noemi & Lis Alecio, Tyrone & González Herrera, Javier, 2020. "Energy supply of a large size desalination plant using wave energy. Practical case: North of Gran Canaria," Applied Energy, Elsevier, vol. 278(C).
    2. Jeremy W. Simmons & James D. Van de Ven, 2023. "Limits on the Range and Rate of Change in Power Take-Off Load in Ocean Wave Energy Conversion: A Study Using Model Predictive Control," Energies, MDPI, vol. 16(16), pages 1-17, August.
    3. Mi, Jia & Wu, Xian & Capper, Joseph & Li, Xiaofan & Shalaby, Ahmed & Wang, Ruoyu & Lin, Shihong & Hajj, Muhammad & Zuo, Lei, 2023. "Experimental investigation of a reverse osmosis desalination system directly powered by wave energy," Applied Energy, Elsevier, vol. 343(C).
    4. Ylänen, Markus M.M. & Lampinen, Markku J., 2014. "Determining optimal operating pressure for AaltoRO – A novel wave powered desalination system," Renewable Energy, Elsevier, vol. 69(C), pages 386-392.
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