Performance analyses of transcritical organic Rankine cycles with large variations of the thermophysical properties in the pseudocritical region

Performance analyses of transcritical organic Rankine cycles with large variations of the thermophysical properties in the pseudocritical region
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准临界区热物理性质变化较大的跨临界有机朗肯循环的性能分析

DOI:
10.1016/j.applthermaleng.2016.02.126
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发表时间:
2016-05
影响因子:
6.4
通讯作者:
史琳
史琳
中科院分区:
工程技术2区
文献类型:
--
作者:
田冉;安青松;翟慧星;史琳

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分析了跨临界有机朗肯循环(ORC)准临界区热物性变化对ORC性能的影响。提出了以净功率、热效率和蒸汽发生器总面积为指标的优化方法。研究了跨临界ORC的涡轮机入口温度和蒸汽发生压力的影响。根据热物理性质的变化,讨论了蒸汽发生器面积的变化。结果表明,蒸汽发生器总面积随涡轮机进口温度沿着N型曲线变化。对于任何热源温度,合适的工作流体应该具有总蒸汽发生器面积的明显的N形曲线,以保证存在最佳参数区域,在该最佳参数区域中,所选指标被优化。这为不同温度的热源提供了工作流体选择标准。该分析简化了操作参数和工作流体的选择。
This study analyzed the influence of the thermophysical properties variations in the pseudocritical region on the transcritical organic Rankine cycles (ORCs) performance. An optimization method is proposed using the net power output, the thermal efficiency and the total vapor generator area as indicators. The effect of the turbine inlet temperature and the vapor generation pressure is investigated for transcritical ORCs. The variations of the vapor generator area are discussed based on the thermophysical property changes. The results show that the total vapor generator area varies with the turbine inlet temperature along an N-shaped curve. For any heat source temperature, the suitable working fluid should have a pronounced N-shaped curve of the total vapor generator area to guarantee the existence of the optimal parameter region in which selected indicators are optimized. This provides a working fluid selection criterion for heat sources of different temperatures. The analysis simplifies the selections of the operating parameters and the working fluids.
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