Thermodynamic performance analyses and optimization of subcritical and transcritical organic Rankine cycles using R1234ze(E) for 100-200 degrees C heat sources
Thermodynamic performance analyses and optimization of subcritical and transcritical organic Rankine cycles using R1234ze(E) for 100-200 degrees C heat sources
复制标题
使用 R1234ze(E) 对 100-200 摄氏度热源进行亚临界和跨临界有机朗肯循环的热力学性能分析和优化
DOI：
10.1016/j.enconman.2017.06.060
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发表时间：
2017
影响因子：
10.4
通讯作者：
Yang Zhen
中科院分区：
文献类型：
--
作者：
Li Jian;Liu Qiang;Ge Zhong;Duan Yuanyuan;Yang Zhen
工作流体对有机朗肯循环（ORC）系统的热力学性能有至关重要的影响。反式-1,3,3,3-四氟丙烯R1234ze(E)是一种新型环保、安全的有机流体，在ORC体系中具有很大的应用潜力。本研究的重点是使用R1234ze(E)驱动的亚临界和跨临界ORCs，该ORCs由100-200°C无出口温度限制的热水驱动。在不同热源温度下，以单位质量流量热源流体的最大系统净输出功率为目标，研究了最优循环类型（亚临界或跨临界）、最优循环参数（涡轮进口温度和涡轮进口压力）和系统性能。结果表明，对于R1234ze(E)，跨临界ORC具有更高的系统效率，但其系统吸热能力低于亚临界ORC。亚临界ORC更适用于温度低于160°C的热源，而跨临界ORC适用于温度更高的热源。对于采用R1234ze(E)的亚临界和跨临界ORCs，给出了100-200℃不同热源温度下的涡轮进口温度和涡轮进口压力优化结果。与R245fa和R600a相比，R1234ze(E)在约100-167℃的无出口温度限制热源下的最大系统净输出功率(E)最大，比R245fa大31.4%，比R600a大25.8%。
The working fluid has a crucial effect on the thermodynamic performance of the organic Rankine cycle (ORC) system. Trans-1,3,3,3-tetrafluoropropene, R1234ze(E), is a new-typed environmental friendly and safe organic fluid that presents a great potential to be used in ORC systems. This study focuses on subcritical and transcritical ORCs using R1234ze(E) driven by the 100–200 °C hot water without the outlet temperature limit. For various heat source temperatures, the optimal cycle type (subcritical or transcritical), optimized cycle parameters (turbine inlet temperature and turbine inlet pressure), and system performance were studied in the view of the maximum system net power output for the per mass flow rate heat source fluid. Results show that the transcritical ORC has a higher system efficiency, whereas its system heat absorption capacity is lower than that of the subcritical ORC for R1234ze(E). The subcritical ORC is more suitable for heat source temperatures below 160 °C with the transcritical ORC for higher temperatures. For subcritical and transcritical ORCs using R1234ze(E), the optimized turbine inlet temperature and turbine inlet pressure for various heat source temperatures among 100–200 °C were also provided. Compared to R245fa and R600a, the maximized system net power output of R1234ze(E) is the largest for the approximately 100–167 °C heat sources without the outlet temperature limit, and it is 31.4% larger than that of R245fa at most and 25.8% larger than that of R600a at most.