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首页> 外文期刊>Energy Conversion & Management >Proposal and assessment of a combined cooling and power system based on the regenerative supercritical carbon dioxide Brayton cycle integrated with an absorption refrigeration cycle for engine waste heat recovery
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Proposal and assessment of a combined cooling and power system based on the regenerative supercritical carbon dioxide Brayton cycle integrated with an absorption refrigeration cycle for engine waste heat recovery

机译：基于可再生超临界二氧化碳布雷顿循环与吸收式制冷循环相结合的发动机余热回收的组合式冷却与动力系统的建议和评估

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摘要

This paper proposes a novel combined cooling and power (CCP) system based on a regenerative supercritical carbon dioxide Brayton cycle (sCO(2) cycle) and an ammonia-water absorption refrigeration cycle (ARC) for engine waste heat recovery. In the proposed system, the supercritical carbon dioxide Brayton cycle absorbs the waste heat of the internal combustion engine to generate power, and the absorption refrigeration cycle utilizes the low-grade energy in the supercritical carbon dioxide turbine exhaust to provide cooling. Firstly, energy and exergy analysis is performed on the combined cooling and power system. Then, detailed parametric analysis is carried out to study the effects of key parameters, such as the compressor outlet pressure, turbine inlet temperature, generator hot-end temperature difference, and evaporator temperature on the exergy efficiency and total product unit cost. Finally, the non-dominated sorting genetic algorithm II is adopted for multi-objective optimization to obtain the maximum exergy efficiency and the minimum total product unit cost. Multi-objective optimization results reveal that better thermodynamic and economic performances can be obtained by lowering the evaporator temperature. Compared with the single regenerative supercritical carbon dioxide system, the proposed system can increase the exergy efficiency by 2.29-2.54%pt (percentage point), and the thermal efficiency by 8.16-18.93%pt, but might increase the total product unit cost. Under different evaporator temperatures (-10-10 degrees C), the proposed system can generate 248.19-253.90 kW of net power output, accounting for 8.48-8.67% of the rated power output of the engine, and produce 70.57-168.86 kW of cooling capacity by consuming 0.445-0.532 kW of pump work. In addition, exergy destruction analyses indicate that the components in the bottoming ARC generally have less exergy destructions.
机译：本文提出了一种基于再生超临界二氧化碳布雷顿循环（sCO（2）循环）和氨水吸收式制冷循环（ARC）的新型联合冷却和动力（CCP）系统，用于发动机余热的回收。在所提出的系统中，超临界二氧化碳布雷顿循环吸收内燃机的废热以产生动力，而吸收式制冷循环利用超临界二氧化碳涡轮废气中的低级能量来提供冷却。首先，对组合的冷却和电力系统进行能量和火用分析。然后，进行详细的参数分析，以研究关键参数（例如压缩机出口压力，涡轮机入口温度，发电机热端温差和蒸发器温度）对火用效率和总产品单位成本的影响。最后，采用非支配排序遗传算法Ⅱ进行多目标优化，获得最大的火用效率和最小的总产品单位成本。多目标优化结果表明，通过降低蒸发器温度可以获得更好的热力学和经济性能。与单再生超临界二氧化碳系统相比，拟议的系统可以将火用效率提高2.29-2.54％pt（百分点），热效率提高8.16-18.93％pt，但可能会增加总产品单位成本。在不同的蒸发器温度（-10-10摄氏度）下，拟议的系统可产生248.19-253.90 kW的净功率输出，占发动机额定功率的8.48-8.67％，并产生70.57-168.86 kW的冷却功率通过消耗0.445-0.532 kW的泵功达到最大容量。另外，火用破坏分析表明，底部ARC中的组件通常具有较少的火用破坏。

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