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Analysis of the high-efficiency EP-OTEC cycle using R152a

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  • Yoon, Jung-In
  • Seol, Sung-Hoon
  • Son, Chang-Hyo
  • Jung, Suk-Ho
  • Kim, Young-Bok
  • Lee, Ho-Saeng
  • Kim, Hyeon-Ju
  • Moon, Jung-Hyun

Abstract

Ocean thermal energy conversion (OTEC) cycles utilize renewable, eco-friendly heat sources. However, their low system efficiency diminishes their advantages and impedes commercialization opportunities. In this study, a liquid–vapor ejector and a motive pump are used to enhance the efficiency of the OTEC system through a modified version called the ejector pump OTEC (EP-OTEC) cycle. By applying a liquid–vapor ejector, lower turbine outlet pressure may result than in the basic OTEC cycle. Additionally, the motive pump increases the motive pressure, thereby strongly affecting the performance of the liquid–vapor ejector. The heat source temperature, mass fraction of the motive flow, and motive pressure are varied to analyze the performance characteristics of the EP-OTEC cycle. Firstly, the higher heat source temperature yields greater turbine power for a given mass flow rate in an evaporator. Moreover, results show that the net power of the EP-OTEC cycle is clearly larger than that of the basic OTEC cycle, proving its superiority. The optimized EP-OTEC cycle using R152a yields a system efficiency of 4.0%, which is 38% higher than that of the basic OTEC cycle.

Suggested Citation

  • Yoon, Jung-In & Seol, Sung-Hoon & Son, Chang-Hyo & Jung, Suk-Ho & Kim, Young-Bok & Lee, Ho-Saeng & Kim, Hyeon-Ju & Moon, Jung-Hyun, 2017. "Analysis of the high-efficiency EP-OTEC cycle using R152a," Renewable Energy, Elsevier, vol. 105(C), pages 366-373.
    • Handle: RePEc:eee:renene:v:105:y:2017:i:c:p:366-373
    DOI: 10.1016/j.renene.2016.12.019
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    References listed on IDEAS

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    1. 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.
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    5. Liu, Weimin & Xu, Xiaojian & Chen, Fengyun & Liu, Yanjun & Li, Shizhen & Liu, Lei & Chen, Yun, 2020. "A review of research on the closed thermodynamic cycles of ocean thermal energy conversion," Renewable and Sustainable Energy Reviews, Elsevier, vol. 119(C).
    6. Hu, Zheng & Deng, Zilong & Gao, Wei & Chen, Yongping, 2023. "Experimental study of the absorption refrigeration using ocean thermal energy and its under-lying prospects," Renewable Energy, Elsevier, vol. 213(C), pages 47-62.
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    8. Zhang, Jingzhi & Zhai, Xiaoyu & Li, Shizhen, 2020. "Numerical studies on the performance of ammonia ejectors used in ocean thermal energy conversion system," Renewable Energy, Elsevier, vol. 161(C), pages 766-776.
    9. Jung, Hyunjun & Subban, Chinmayee V. & McTigue, Joshua Dominic & Martinez, Jayson J. & Copping, Andrea E. & Osorio, Julian & Liu, Jian & Deng, Z. Daniel, 2022. "Extracting energy from ocean thermal and salinity gradients to power unmanned underwater vehicles: State of the art, current limitations, and future outlook," Renewable and Sustainable Energy Reviews, Elsevier, vol. 160(C).
    10. Khosravi, A. & Syri, Sanna & Assad, M.E.H. & Malekan, M., 2019. "Thermodynamic and economic analysis of a hybrid ocean thermal energy conversion/photovoltaic system with hydrogen-based energy storage system," Energy, Elsevier, vol. 172(C), pages 304-319.
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