Performance characteristics and working fluid selection for low-temperature binary-flashing cycle
Performance characteristics and working fluid selection for low-temperature binary-flashing cycle
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DOI：
10.1016/j.applthermaleng.2018.05.106
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发表时间：
2018-08
影响因子：
6.4
通讯作者：
Xi Liu;Huashan Li;X. Bu;Lingbao Wang;Ning Xie;Jie Zeng
中科院分区：
文献类型：
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作者：
Xi Liu;Huashan Li;X. Bu;Lingbao Wang;Ning Xie;Jie Zeng
本文研究了低温热能驱动的二元闪蒸循环（BFC）的性能特点。对R245fa、R1233zd（E）、R1234yf、R1234ze、R1234ze（Z）、R600、R600a、R601和R601a等9种工质在BFC中的应用潜力进行了初步研究。结果表明，存在一个使BFC获得最佳热力学性能的最佳蒸汽发生温度。对于最大净功率输出，存在一个最佳闪蒸温度，闪蒸温度的提高总是导致热效率和第二定律效率的提高，以及总火用损失率和所需冷却水质量流量的降低。当BFC运行在最佳的蒸汽发生温度和闪蒸温度时，热源温度对BFC的性能总是有积极的贡献。此外，BFC的热力学性能及其最佳参数与工质的临界温度有很大的关系。工质的临界温度越高，BFC的性能越好。因此，在所考察的工质中，临界温度最高的R601应推荐作为BFC的工质。
In this paper, the performance characteristics of a low-temperature thermal energy driven binary-flashing cycle (BFC) for power generation have been investigated. Also, the potentials of nine working fluids, including R245fa, R1233zd(E), R1234yf, R1234ze, R1234ze(Z), R600, R600a, R601 and R601a used in the BFC are comparably examined. Results show that, there exists an optimum vapor generation temperature that makes the BFC obtain the best thermodynamic performance. Also, an optimum flashing temperature exists for maximum net power output, while an increase in the flashing temperature always leads to the thermal efficiency and second law efficiency increasing as well as the total exergy destruction rate and cooling water mass flow rate needed decreasing. With the BFC operating at optimum vapor generation temperature and flashing temperature, the heat source temperature always offers positive contribution on the BFC performance. Besides, the thermodynamic performance of the BFC as well as its optimum parameters has a strong connection with the critical temperature of working fluids in general. The higher the critical temperature of working fluids is, the better the BFC performance will be. Therefore, among the working fluids examined, R601 with the highest critical temperature should be recommended as working fluid for the BFC.