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Energies 2013, 6(2), 1050-1067; doi:10.3390/en6021050

Exergy and Exergoeconomic Model of a Ground-Based CAES Plant for Peak-Load Energy Production

2,*  and 2
1 GE Oil & Gas Nuovo Pignone SrL, Firenze, Italy 2 UniversitĂ  degli Studi di Firenze, Dipartimento di Ingegneria Industriale, Firenze, Italy
* Author to whom correspondence should be addressed.
Received: 7 November 2012 / Revised: 11 December 2012 / Accepted: 22 January 2013 / Published: 19 February 2013
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Compressed Air Energy Storage is recognized as a promising technology for applying energy storage to grids which are more and more challenged by the increasing contribution of renewable such as solar or wind energy. The paper proposes a medium-size ground-based CAES system, based on pressurized vessels and on a multiple-stage arrangement of compression and expansion machinery; the system includes recovery of heat from the intercoolers, and its storage as sensible heat in two separate (hot/cold) water reservoirs, and regenerative reheat of the expansions. The CAES plant parameters were adapted to the requirements of existing equipment (compressors, expanders and heat exchangers). A complete exergy analysis of the plant was performed. Most component cost data were procured from the market, asking specific quotations to the industrial providers. It is thus possible to calculate the final cost of the electricity unit (kWh) produced under peak-load mode, and to identify the relative contribution between the two relevant groups of capital and component inefficiencies costs.
Keywords: Compressed Air Energy Storage (CAES); exergy; exergoeconomics; thermoeconomics Compressed Air Energy Storage (CAES); exergy; exergoeconomics; thermoeconomics
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Buffa, F.; Kemble, S.; Manfrida, G.; Milazzo, A. Exergy and Exergoeconomic Model of a Ground-Based CAES Plant for Peak-Load Energy Production. Energies 2013, 6, 1050-1067.

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