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Off-design performance analysis of a closed-cycle ocean thermal energy conversion system with solar thermal preheating and superheating

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  • Aydin, Hakan
  • Lee, Ho-Saeng
  • Kim, Hyeon-Ju
  • Shin, Seung Kyoon
  • Park, Keunhan

Abstract

This article reports the off-design performance analysis of a closed-cycle ocean thermal energy conversion (OTEC) system when a solar thermal collector is integrated as an add-on preheater or superheater. Design-point analysis of a simple OTEC system was numerically conducted to generate a gross power of 100 kW, representing a base OTEC system. In order to improve the power output of the OTEC system, two ways of utilizing solar energy are considered in this study: (1) preheating of surface seawater to increase its input temperature to the cycle and (2) direct superheating of the working fluid before it enters a turbine. Obtained results reveal that both preheating and superheating cases increase the net power generation by 20–25% from the design-point. However, the preheating case demands immense heat load on the solar collector due to the huge thermal mass of the seawater, being less efficient thermodynamically. The superheating case increases the thermal efficiency of the system from 1.9% to around 3%, about a 60% improvement, suggesting that this should be a better approach in improving the OTEC system. This research provides thermodynamic insight on the potential advantages and challenges of adding a solar thermal collection component to OTEC power plants.

Suggested Citation

  • Aydin, Hakan & Lee, Ho-Saeng & Kim, Hyeon-Ju & Shin, Seung Kyoon & Park, Keunhan, 2014. "Off-design performance analysis of a closed-cycle ocean thermal energy conversion system with solar thermal preheating and superheating," Renewable Energy, Elsevier, vol. 72(C), pages 154-163.
    • Handle: RePEc:eee:renene:v:72:y:2014:i:c:p:154-163
    DOI: 10.1016/j.renene.2014.07.001
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    References listed on IDEAS

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    6. Milad Shadman & Corbiniano Silva & Daiane Faller & Zhijia Wu & Luiz Paulo de Freitas Assad & Luiz Landau & Carlos Levi & Segen F. Estefen, 2019. "Ocean Renewable Energy Potential, Technology, and Deployments: A Case Study of Brazil," Energies, MDPI, vol. 12(19), pages 1-37, September.
    7. Huo, Erguang & Chen, Wei & Deng, Zilong & Gao, Wei & Chen, Yongping, 2023. "Thermodynamic analysis and optimization of a combined cooling and power system using ocean thermal energy and solar energy," Energy, Elsevier, vol. 278(PA).
    8. Osorio, Andrés F. & Arias-Gaviria, Jessica & Devis-Morales, Andrea & Acevedo, Diego & Velasquez, Héctor Iván & Arango-Aramburo, Santiago, 2016. "Beyond electricity: The potential of ocean thermal energy and ocean technology ecoparks in small tropical islands," Energy Policy, Elsevier, vol. 98(C), pages 713-724.
    9. Ma, Qingfen & Gao, Zezhou & Huang, Jie & Mahian, Omid & Feng, Xin & Lu, Hui & Wang, Shenghui & Wang, Chengpeng & Tang, Rongnian & Li, Jingru, 2023. "Thermodynamic analysis and turbine design of a 100 kW OTEC-ORC with binary non-azeotropic working fluid," Energy, Elsevier, vol. 263(PE).
    10. Hu, Huakun & Xue, Wendong & Jiang, Peng & Li, Yong, 2022. "Bibliometric analysis for ocean renewable energy: An comprehensive review for hotspots, frontiers, and emerging trends," Renewable and Sustainable Energy Reviews, Elsevier, vol. 167(C).
    11. Robert J. Brecha & Katherine Schoenenberger & Masaō Ashtine & Randy Koon Koon, 2021. "Ocean Thermal Energy Conversion—Flexible Enabling Technology for Variable Renewable Energy Integration in the Caribbean," Energies, MDPI, vol. 14(8), pages 1-19, April.
    12. 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).
    13. Zhang, Zhixiang & Yuan, Han & Mei, Ning, 2023. "Theoretical analysis on extraction-ejection combined power and refrigeration cycle for ocean thermal energy conversion," Energy, Elsevier, vol. 273(C).
    14. Fan, Chengcheng & Wu, Zhe & Wang, Jiadian & Chen, Yongping & Zhang, Chengbin, 2023. "Thermodynamic process control of ocean thermal energy conversion," Renewable Energy, Elsevier, vol. 210(C), pages 810-821.
    15. 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.

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