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Performance Analysis and Multi-Objective Optimization of a Cooling-Power-Desalination Combined Cycle for Shipboard Diesel Exhaust Heat Recovery

Author

Listed:
  • Qizhi Gao

    (College of Engineering, Ocean University of China, Qingdao 266100, China)

  • Senyao Zhao

    (College of Engineering, Ocean University of China, Qingdao 266100, China)

  • Zhixiang Zhang

    (College of Engineering, Ocean University of China, Qingdao 266100, China)

  • Ji Zhang

    (Smart Energy Group, The State Key Laboratory of Internet of Things for Smart City, Department of Electrical and Computer Engineering, University of Macau, Macau 999078, China)

  • Yuan Zhao

    (College of Engineering, Ocean University of China, Qingdao 266100, China)

  • Yongchao Sun

    (College of Engineering, Ocean University of China, Qingdao 266100, China)

  • Dezhi Li

    (College of Engineering, Ocean University of China, Qingdao 266100, China)

  • Han Yuan

    (College of Engineering, Ocean University of China, Qingdao 266100, China)

Abstract

This study presents a novel cooling-power-desalination combined cycle for recovering shipboard diesel exhaust heat, integrating a freezing desalination sub-cycle to regulate the ship’s cooling-load fluctuations. The combined cycle employs ammonia–water as the working fluid and efficiently utilizes excess cooling capacity to pretreat reverse osmosis desalination. By adjusting the mass flow rate of the working fluid in both the air conditioning refrigeration cycle and the freezing desalination sub-cycle, the combined cycle can dynamically meet the cooling-load demand under different working conditions and navigation areas. To analyze the cycle’s performance, a mathematical model is established for energy and exergy analysis, and key parameters including net output work, comprehensive efficiency, and heat exchanger area are optimized using the MOPSO algorithm. The results indicate that the system achieves optimal performance when the generator temperature reaches 249.95 °C, the sea water temperature is 22.29 °C, and 42% ammonia–water is used as the working fluid. Additionally, an economic analysis of frozen seawater desalination as RO seawater desalination pretreatment reveals a substantial cost reduction of 22.69%, showcasing the advantageous features of this proposed cycle. The research in this paper is helpful for waste energy recovery and sustainable development.

Suggested Citation

  • Qizhi Gao & Senyao Zhao & Zhixiang Zhang & Ji Zhang & Yuan Zhao & Yongchao Sun & Dezhi Li & Han Yuan, 2023. "Performance Analysis and Multi-Objective Optimization of a Cooling-Power-Desalination Combined Cycle for Shipboard Diesel Exhaust Heat Recovery," Sustainability, MDPI, vol. 15(24), pages 1-32, December.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:24:p:16942-:d:1302484
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    References listed on IDEAS

    as
    1. 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).
    2. Song, Jian & Song, Yin & Gu, Chun-wei, 2015. "Thermodynamic analysis and performance optimization of an Organic Rankine Cycle (ORC) waste heat recovery system for marine diesel engines," Energy, Elsevier, vol. 82(C), pages 976-985.
    3. Yang, Min-Hsiung & Yeh, Rong-Hua, 2015. "Thermodynamic and economic performances optimization of an organic Rankine cycle system utilizing exhaust gas of a large marine diesel engine," Applied Energy, Elsevier, vol. 149(C), pages 1-12.
    4. Wang, Jiangfeng & Dai, Yiping & Gao, Lin, 2008. "Parametric analysis and optimization for a combined power and refrigeration cycle," Applied Energy, Elsevier, vol. 85(11), pages 1071-1085, November.
    5. Yang, Min-Hsiung, 2016. "Optimizations of the waste heat recovery system for a large marine diesel engine based on transcritical Rankine cycle," Energy, Elsevier, vol. 113(C), pages 1109-1124.
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