Effects of relative volume-ratios on dynamic performance of a direct-heated supercritical carbon-dioxide closed Brayton cycle in a solar-thermal power plant

Rajinesh Singh, Andrew S. Rowlands and Sarah A. Miller

Energy, 2013, vol. 55, issue C, 1025-1032

Abstract: The effect of the relative hot-to-cold side volume-ratios on dynamic characteristics of a CBC (closed Brayton cycle) with sCO2 (supercritical carbon-dioxide) as the working-fluid is investigated in this study. The analysis of the CBC is conducted in the context of power generation in a direct-heated (no thermal-oil loop) and dry-cooled parabolic-trough solar thermal power plant, using a control-oriented model of the CBC. Dynamic performance of the sCO2 CBC with different relative volume-ratios between the hot and cold sides of the sCO2 CBC is compared using simulations for conditions on a representative summer day. The CBC hot-to-cold side volume-ratio influences CO2 mass movement and hence power output. Increasing the hot-to-cold side volume-ratio in the CBC results in a slower, more gradual dynamic response when there are fluctuations in solar heat input and ambient air temperatures. The dynamic response characteristics of a CBC with a hot-to-cold side volume-ratio less than one are shown to differ significantly from a CBC with a volume-ratio greater than or equal to one.

Keywords: Solar thermal; Supercritical carbon dioxide; Dynamic modelling; Closed Brayton cycle; Dynamic response; Volume effects (search for similar items in EconPapers)
Date: 2013
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Citations: View citations in EconPapers (22)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:55:y:2013:i:c:p:1025-1032

DOI: 10.1016/j.energy.2013.03.049

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