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An experimental study on operation characteristics of the organic Rankine cycle system under the single-and multiple-variables regulation
Sustainable Energy Technologies and Assessments ( IF 7.1 ) Pub Date : 2020-07-23 , DOI: 10.1016/j.seta.2020.100785
Mengjie Bai , Ying Zhang , Shuai Deng , Li Zhao , Ruikai Zhao , Yani Lu

This work aims to investigate the operation characteristics of an organic Rankine cycle (ORC) system under the variable mass flow rate of the working fluid (ṁwf), such as the flow excursion in the field of direct vapor generation (DVG) systems. Besides, the mass flow rate of cooling source (ṁcs) was verified as an effective manipulated variable to respond the variation of ṁwf, which was an easily available freedom in the ORC system. The operation characteristic was tested respectively for ṁwf and ṁcs, where the change form of the single variable was rectangular-wave steps with different amplitudes. To verify the effectiveness of regulating ṁcs, the operation characteristics under the changes of multiple variables including the ṁwf and ṁcs were tested. The results indicate that the ṁwf dominates the variation of operation parameters of the ORC apparently, especially the evaporation pressure. Specifically, the evaporation pressure increases about 26.10 kPa as the ṁwf increases about 0.01 kg/s. The ṁcs also affects the operation parameters, which shows the opposite trend in evaporation pressure and condensing pressure compared with the increase of ṁwf. The results show that when the ṁwf increases, the increase of pressure can be reduced and the thermal efficiency can be improved by regulating the ṁcs in the same direction simultaneously. The increase of the theoretical thermal efficiency of the system is about 11.21% when only the ṁwf is inclined 0.01 kg/s, while it is 18.00% when the ṁcs is inclined 0.12 kg/s at the same time. The experimental findings enable to give a reference on designing control strategies for the DVG ORC systems.



中文翻译:

单变量和多变量调节下有机朗肯循环系统运行特性的实验研究

这项工作旨在研究在工作流体质量流量可变的情况下有机朗肯循环(ORC)系统的运行特性(̇wf),例如直接蒸气发生(DVG)系统领域中的流动偏移。此外,冷却源的质量流量(̇cs)被验证为有效的变量来响应 ̇wf,这是ORC系统中容易获得的自由。操作特性分别进行了测试̇wḟcs,其中单个变量的变化形式是具有不同幅度的矩形波阶跃。验证调节的有效性̇cs,在多个变量(包括 ̇wḟcs经过测试。结果表明̇wf显然主导了ORC操作参数的变化,尤其是蒸发压力。具体而言,随着温度的升高,蒸发压力增加约26.10 kPa。̇wf增加约0.01公斤/秒。的̇cs 也会影响运行参数,与增加相比,蒸发压力和冷凝压力呈现相反的趋势。 ̇wf。结果表明,当̇wf 通过调节压力的增加,可以减少压力的增加,并可以提高热效率。 ̇cs在同一方向上同时进行。当仅当系统运行时,系统的理论热效率提高约11.21%。̇wf 倾斜0.01 kg / s,而当倾斜为18.00% ̇cs同时倾斜0.12 kg / s。实验结果可为DVG ORC系统的控制策略设计提供参考。

更新日期:2020-07-23
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