Abstract To develop the energy-efficient and flexible waste heat recovery process for cruise ship application, a novel combined system with transcritical CO2 Rankine cycle and ejector refrigeration cycle (ETCRC) is presented. The proposed system driven by main engine exhaust gas can be selectively operated in a specific mode with adjustable capacities of heating, cooling and power to satisfy shipboard demands. The simulation model is developed for performance analysis from the thermodynamic aspect. Moreover, a typical transcritical CO2 Rankine cycle coupled with valve-expansion refrigeration process (VTRCR) and a conventional regenerative organic Rankine cycle (RORC) using R123 are considered as reference systems. Parametric investigation and performance comparison between the present system and each considered reference system in different operation modes are respectively conducted. Furthermore, based on artificial bee colony (ABC) algorithm and fast-non-dominated sorting technique, multi-objective optimization for the proposed system is performed to maximize useful energy productions. According to the results, the proposed combined cycle is found to be more efficient than the reference cycle in each of the specified operation mode. Under the optimal conditions, the maximum cooling effect and net power of the ETCRC in Mode-S operation are 863.3 kW and 202.9 kW, respectively. And the maximum high-temperature heating output and net power of the ETCRC for Mode-SAW operation are 960.5 kW and 272.7 kW, respectively. The performance characteristics of the proposed cycle theoretically demonstrate its advantages for application in cruise ships.

中文翻译：

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游轮应用跨临界二氧化碳余热回收系统的热力学分析及多目标优化

摘要 为了开发用于游轮应用的节能且灵活的废热回收工艺，提出了一种具有跨临界 CO2 朗肯循环和喷射器制冷循环 (ETCRC) 的新型组合系统。所提出的由主机废气驱动的系统可以选择性地在特定模式下运行，加热、冷却和电力的能力可调，以满足船上的需求。该仿真模型是为从热力学方面进行性能分析而开发的。此外，典型的跨临界 CO2 朗肯循环与阀门膨胀制冷过程 (VTRCR) 和使用 R123 的常规再生有机朗肯循环 (RORC) 被视为参考系统。分别对本系统与各考虑的参考系统在不同操作模式下进行参数调查和性能比较。此外，基于人工蜂群（ABC）算法和快速非支配排序技术，对所提出的系统进行多目标优化，以最大化有用的能量生产。根据结果​​，在每个指定的操作模式下，发现所提出的联合循环比参考循环更有效。在最优条件下，ETCRC在Mode-S运行时的最大冷却效果和净功率分别为863.3 kW和202.9 kW。Mode-SAW 运行的 ETCRC 的最大高温加热输出和净功率分别为 960.5 kW 和 272.7 kW。