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Off-design performance of closed OTEC cycles for power generation

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  • Giostri, Andrea
  • Romei, Alessandro
  • Binotti, Marco

Abstract

The present study illustrates the development of a detailed model to estimate the part-load performance of an ammonia closed OTEC system for on-shore installations. A previously published Matlab® suite is extended by accounting for off-design conditions in terms of variable seawater temperature and mass flow on the cycle performance. The off-design behavior of each component is thoroughly discussed, with particular attention devoted to the single-stage axial-flow turbine, whose performance maps are obtained by means of three-dimensional CFD simulations. Assuming a representative plant sized for warm seawater temperature of 28 °C and cold seawater temperature of 4 °C (8500 kg/s taken from 1000 m depth), the model predicts an annual electricity yield of 15.963 GWhe and LCOE of 316 €/MWhe when including seawater measured data of a simile-Hawaiian site. Moreover, a sensitivity analysis is assessed in order to identify the best design parameters (i.e. warm seawater temperature and cold seawater mass flow rate) that minimize the LCOE for the given location. The new design guarantees a reduction of approximately 11% of the LCOE (284 €/MWhe). The simulation capabilities of the developed model prove it as valuable tool to estimate the OTEC competitiveness in different scenarios.

Suggested Citation

  • Giostri, Andrea & Romei, Alessandro & Binotti, Marco, 2021. "Off-design performance of closed OTEC cycles for power generation," Renewable Energy, Elsevier, vol. 170(C), pages 1353-1366.
    • Handle: RePEc:eee:renene:v:170:y:2021:i:c:p:1353-1366
    DOI: 10.1016/j.renene.2021.02.047
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    Citations

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    Cited by:

    1. Yang, Min-Hsiung & Yeh, Rong-Hua, 2022. "Investigation of the potential of R717 blends as working fluids in the organic Rankine cycle (ORC) for ocean thermal energy conversion (OTEC)," Energy, Elsevier, vol. 245(C).
    2. Xiaowei Yang & Yanjun Liu & Yun Chen & Li Zhang, 2022. "Optimization Design of the Organic Rankine Cycle for an Ocean Thermal Energy Conversion System," Energies, MDPI, vol. 15(18), pages 1-19, September.
    3. Chen, Fengyun & Liu, Lei & Zeng, Hao & Peng, Jingping & Ge, Yunzheng & Liu, Weimin, 2024. "Theoretical and experimental study on the secondary heat recovery cycle of the mixed working fluid in ocean thermal energy conversion," Renewable Energy, Elsevier, vol. 227(C).
    4. Langer, Jannis & Infante Ferreira, Carlos & Quist, Jaco, 2022. "Is bigger always better? Designing economically feasible ocean thermal energy conversion systems using spatiotemporal resource data," Applied Energy, Elsevier, vol. 309(C).
    5. Mao, Liangjie & Wei, Changjiang & Zeng, Song & Cai, Mingjie, 2023. "Heat transfer mechanism of cold-water pipe in ocean thermal energy conversion system," Energy, Elsevier, vol. 269(C).
    6. Chen, Ruihua & Deng, Shuai & Zhao, Li & Zhao, Ruikai & Xu, Weicong, 2022. "Energy recovery from wastewater in deep-sea mining: Feasibility study on an energy supply solution with cold wastewater," Applied Energy, Elsevier, vol. 305(C).
    7. Hu, Zheng & Chen, Yongping & Zhang, Chengbin, 2024. "Role of R717 blends in ocean thermal energy conversion organic Rankine cycle," Renewable Energy, Elsevier, vol. 221(C).
    8. Peng, Jingping & Ge, Yunzheng & Chen, Fengyun & Liu, Lei & Wu, Haoyu & Liu, Weimin, 2022. "Theoretical and experimental study on the performance of a high-efficiency thermodynamic cycle for ocean thermal energy conversion," Renewable Energy, Elsevier, vol. 185(C), pages 734-747.
    9. Hall, Kashawn & Kelly, Solange & Henry, Legena, 2022. "Site selection of Ocean Thermal Energy Conversion (OTEC) plants for Barbados," Renewable Energy, Elsevier, vol. 201(P2), pages 60-69.

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