A trade-off between maxima in efficiency and specific work output of super- and trans-critical CO2 Brayton cycles

Garg, Pardeep and Kumar, Pramod and Srinivasan, Kandadai (2015) A trade-off between maxima in efficiency and specific work output of super- and trans-critical CO2 Brayton cycles. In: JOURNAL OF SUPERCRITICAL FLUIDS, 98 . pp. 119-126.

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Abstract

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.

Item Type:	Journal Article
Publication:	JOURNAL OF SUPERCRITICAL FLUIDS
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords:	Supercritical CO2; Brayton cycles; Operational aspects; Empirical relations; Concentrated solar power
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	20 Apr 2015 06:58
Last Modified:	20 Apr 2015 06:58
URI:	http://eprints.iisc.ac.in/id/eprint/51227

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