Optimal evaporating temperature and exergy analysis for organic Rankine cycle

被引：0

作者：

Zhang, Junhui ^{[1
,2
]}

Liu, Juanfang ^{[1
,2
]}

Chen, Qinghua ^{[1
,2
]}

机构：

[1] Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University

[2] College of Power Engineering, Chongqing University

来源：

Huagong Xuebao/CIESC Journal | 2013年 / 64卷 / 03期

关键词：

Exergy analysis; Maximum useful work; Optimal evaporating temperature; Organic Rankine cycle;

D O I：

10.3969/j.issn.0438-1157.2013.03.006

中图分类号：

学科分类号：

摘要：

Since energy issues become increasingly urgent in the world, considerable interest has focused on the utilization of low-grade waste heat. Organic Rankine cycle (ORC) is one of the effective routes to transform the low-grade waste heat to electricity. In this study, the maximum useful output work and exergy efficiency of the ORC are selected as the objective functions. 10 different working fluids are chosen to comprehensively investigate and analyze the important characteristics of the two objective functions in the subcritical state. The results show that an optimal evaporating temperature exists for each working fluid, at which the useful work is the maximum. Moreover, the higher the critical temperature, the higher the optimal evaporating temperature. It is found that for the same heat source, the exergy efficiency decreases with the increase of the pinch point temperature difference. For the same pinch point temperature difference, the exergy efficiency has a maximum value when the heat source inlet temperature is twice of the pinch point temperature difference lower than the critical temperature. Otherwise, the exergy efficiency keeps increasing with the heat source temperature. These results provide some valuable guidance to optimize the ORC system and screen working fluid. © All Rights Reserved.

引用

页码：820 / 826

页数：6

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