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首页> 外文期刊>Energy Conversion & Management >Thermodynamic analysis and multi-objective optimization of a novel power/cooling cogeneration system for low-grade heat sources
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Thermodynamic analysis and multi-objective optimization of a novel power/cooling cogeneration system for low-grade heat sources

机译：新型低品位热电联产制冷系统的热力学分析和多目标优化

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摘要

A novel power/cooling cogeneration system based on an ammonia-water power cycle is proposed and investigated. The cooling capacity of the conventional combined system is much improved since an absorption-ejector refrigeration cycle is introduced. Besides the novel combined system could get more high-grade work at the same time obtain amounts of refrigeration due to the unique coupling mode. A mathematical model of the novel system is developed for system simulations under steady-state conditions. The results show that the thermal efficiency and the energy efficiency are 21.34% and 38.95%, respectively. Energy analysis shows that the energy destruction mainly occurs in the recovery heat exchanger, followed by boiler and rectifier, respectively. Parametric study shows that the absorber temperature, the cycle high pressure, the temperature at boiler outlet and the extracting ratio have significant effects on the system performance. In addition, a multi-objective optimization using NSGA-II method is carried out to obtain the final optimums of the proposed system. The optimization results show that the energy efficiency and the overall capital cost rate are 37.24% and 0.69408 $/ h, respectively, and the thermal efficiency versus the overall capital cost rate are found to be 20.99% and 0.73351 $/h.
机译：提出并研究了一种基于氨水动力循环的新型电力/制冷热电联产系统。由于引入了吸收-喷射器制冷循环，因此大大提高了常规组合系统的冷却能力。此外，由于独特的耦合方式，新颖的组合系统可以同时进行更多高级工作，并获得一定数量的制冷量。开发了该新型系统的数学模型，用于稳态条件下的系统仿真。结果表明，热效率和能源效率分别为21.34％和38.95％。能量分析表明，能量破坏主要发生在回收热交换器中，其次是锅炉和整流器。参数研究表明，吸收塔温度，循环高压，锅炉出口温度和萃取比对系统性能有重要影响。此外，使用NSGA-II方法进行了多目标优化，从而获得了所提出系统的最终最优方案。优化结果表明，能源效率和总投资成本率分别为37.24％和0.69408 $ / h，热效率与总投资成本率分别为20.99％和0.73351 $ / h。

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