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Optimization Design of the Organic Rankine Cycle for an Ocean Thermal Energy Conversion System

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  • Xiaowei Yang

    (Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China
    Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, China)

  • Yanjun Liu

    (Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China
    Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, China)

  • Yun Chen

    (Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China
    Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, China)

  • Li Zhang

    (Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524000, China)

Abstract

This study selects five parameters as decision variables for the optimization design of an ocean thermal energy conversion system, including the evaporating temperature, the condensing temperature, the pinch-point temperature difference between the evaporator and condenser, and the working fluid flow rate. The optimization goal is to maximize the net output power per unit area and the exergy efficiency. The final scheme is comprehensively screened out from the Pareto solution set through some evaluation indexes. Finally, this study also analyzes the effects of four decision variables on the optimization objectives and the evaluation indexes. This study finds that evaporating temperature and condensing temperature have similar effects on the two objective functions. However, the pinch-point temperature difference has different effects on them. The back work ratio is obviously affected by the condensing temperature. A small pinch-point temperature difference is beneficial and improves the performance of an ocean thermal energy conversion system. The effects of evaporating temperature and condensing temperature on the investment cost per unit net output power are roughly similar to those on the net output power per unit heat exchange area. However, the effects of the pinch-point temperature difference on the two performance aspects are inconsistent.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:18:p:6683-:d:913399
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    References listed on IDEAS

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    5. 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.
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