Numerical analysis and optimization design of fin-and-tube evaporator in organic Rankine cycle system for diesel engine waste heat recovery
Numerical analysis and optimization design of fin-and-tube evaporator in organic Rankine cycle system for diesel engine waste heat recovery
复制标题
柴油机余热回收有机朗肯循环系统翅片管式蒸发器数值分析与优化设计
DOI：
10.1016/j.ijheatmasstransfer.2021.121376
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发表时间：
2021-08
影响因子：
5.2
通讯作者：
Dong Yan
中科院分区：
文献类型：
--
作者：
Wujie Zhang;Fubin Yang;Hongguang Zhang;Xu Ping;Dong Yan
有机朗肯循环（ORC）可以有效地回收内燃机的废热。蒸发器是一个重要的部件，它决定了有多少废热可以回收。提高蒸发器中排气的传热性能和减小流动阻力不仅可以提高ORC系统的热-功转换效率，而且可以减小蒸发器对ICE运行的影响。柴油机-有机朗肯循环（DE-ORC）系统的实验结果表明，采用计算流体动力学方法建立了翅片管蒸发器的仿真模型。通过对翅片管式蒸发器结构的改进，在柴油机典型工况下研究了其传热性能和排气流动状态。此外，采用遗传算法对蒸发器进行优化，得到了蒸发器的非均匀结构。结果表明，采用星型翅片和适当选择椭圆管的参数可以提高蒸发器的性能。非均匀结构的蒸发器可以进一步提高传热性能，减少ORC系统对柴油机运行的影响。优化结果表明，面积优良因子（η）提高了173.76%，场协同模数平均角（θφm）和摩擦系数f分别降低了6.17°和56.67%。
Organic Rankine cycle (ORC) can efficiently recover exhaust heat of internal combustion engines (ICEs). Evaporator is an important component that determines how much waste heat can be recovered. Enhancing heat transfer performance and reducing flow resistance of the exhaust in the evaporator can improve not only heat-to-work conversion efficiency of the ORC system but also reduce the influence of the evaporator on the operation of the ICE. Experimental results of the combined diesel engine–organic Rankine cycle (DE–ORC) system showed that the simulation model of a fin-and-tube evaporator is established via computational fluid dynamic method. The heat transfer performance and flow state of exhaust are investigated by improving the structure of the fin-and-tube evaporator under typical working conditions of the diesel engine. In addition, genetic algorithm is used to optimize the evaporator to obtain the nonuniform structure of the evaporator. Results showed that the performance of the evaporator can be improved using a star-shaped fin and appropriately selected parameters of elliptical tube. The nonuniform structural evaporator can further enhance the heat transfer performance and reduce the influence of the ORC system on the operation of the diesel engine. The optimization results demonstrated that the area goodness factor (η) increases by 173.76% while the field synergy module average angle (θφm) and friction factorfreduces by 6.17° and 56.67%, respectively.
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DOI：
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DOI：
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