期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 98, 期 -, 页码 119-126出版社
ELSEVIER
DOI: 10.1016/j.supflu.2014.12.023
关键词
Supercritical CO2; Brayton cycles; Operational aspects; Empirical relations; Concentrated solar power
资金
- Solar Energy Research Institute for India and the U.S. (SERIIUS) - U.S. Department of Energy [DE AC36-08G028308]
- Office of International Affairs
- Government of India [IUSSTF/JCERDC-SERIIUS/2012]
Several operational aspects for thermal power plants in general are non-intuitive and involve simultaneous optimization of a number of operational parameters. In the case of solar operated power plants, it is even more difficult due to varying heat source temperatures induced by variability in insolation levels. This paper introduces a quantitative methodology for load regulation of a CO2 based Brayton cycle power plant using the 'thermal efficiency and specific work output' coordinate system. The analysis shows that a transcritical CO2 cycle offers more flexibility under part load performance than the supercritical cycle in case of non-solar power plants. However, for concentrated solar power, where efficiency is important, supercritical CO2 cycle fares better than transcritical CO2 cycle. A number of empirical equations relating heat source temperature, high side pressure with efficiency and specific work output are proposed which could assist in generating control algorithms. (C) 2015 Elsevier B.V. All rights reserved.
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