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

Qizhi Gao, Senyao Zhao, Zhixiang Zhang, Ji Zhang, Yuan Zhao, Yongchao Sun, Dezhi Li and Han Yuan ()
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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

Sustainability, 2023, vol. 15, issue 24, 1-32

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.

Keywords: shipboard heat recovery; cooling power and desalination; freezing desalination; thermodynamic analysis; multi-objective optimization (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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