Off-design performance analysis of a solar-powered organic Rankine cycle
Off-design performance analysis of a solar-powered organic Rankine cycle
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太阳能有机朗肯循环的非设计性能分析
DOI：
10.1016/j.enconman.2014.01.032
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发表时间：
2014-04-01
影响因子：
10.4
通讯作者：
Dai, Yiping
中科院分区：
文献类型：
--
作者：
Wang, Jiangfeng;Yan, Zhequan;Dai, Yiping
热力系统在非设计工况下的性能评估对于保证系统的可靠运行和经济运行具有重要意义。本研究建立了太阳能驱动有机朗肯循环的非设计模型，采用复合抛物面集热器（CPC）收集太阳辐射，并采用蓄热单元实现整个系统的连续运行。研究了系统在环境温度、蒸汽发生器和CPC热油质量流量变化下的非设计行为。此外，还分析了系统在全天和不同月份的非设计性能。结果表明，降低环境温度或提高蒸汽发生器和CPC的热油质量流量可以改善非设计性能。12月是系统平均火用效率最高的时间段，6月或9月是系统净输出功率最大的时间段。8月份净输出功率和平均火用效率均达到最低。(C) 2014 Elsevier Ltd.版权所有。
Performance evaluation of a thermodynamic system under off-design conditions is very important for reliable and cost-effective operation. In this study, an off-design model of an organic Rankine cycle driven by solar energy is established with compound parabolic collector (CPC) to collect the solar radiation and thermal storage unit to achieve the continuous operation of the overall system. The system off-design behavior is examined under the change in environment temperature, as well as thermal oil mass flow rates of vapor generator and CPC. In addition, the off-design performance of the system is analyzed over a whole day and in different months. The results indicate that a decrease in environment temperature, or the increases in thermal oil mass flow rates of vapor generator and CPC could improve the off-design performance. The system obtains the maximum average exergy efficiency in December and the maximum net power output in June or in September. Both the net power output and the average exergy efficiency reach minimum values in August. (C) 2014 Elsevier Ltd. All rights reserved.