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Adiabatic Compressed Air Energy Storage with packed bed thermal energy storage.
- Source :
-
Applied Energy . Oct2015, Vol. 155, p804-815. 12p. - Publication Year :
- 2015
-
Abstract
- The majority of articles on Adiabatic Compressed Air Energy Storage (A-CAES) so far have focussed on the use of indirect-contact heat exchangers and a thermal fluid in which to store the compression heat. While packed beds have been suggested, a detailed analysis of A-CAES with packed beds is lacking in the available literature. This paper presents such an analysis. We develop a numerical model of an A-CAES system with packed beds and validate it against analytical solutions. Our results suggest that an efficiency in excess of 70% should be achievable, which is higher than many of the previous estimates for A-CAES systems using indirect-contact heat exchangers. We carry out an exergy analysis for a single charge–storage–discharge cycle to see where the main losses are likely to transpire and we find that the main losses occur in the compressors and expanders (accounting for nearly 20% of the work input) rather than in the packed beds. The system is then simulated for continuous cycling and it is found that the build-up of leftover heat from previous cycles in the packed beds results in higher steady state temperature profiles of the packed beds. This leads to a small reduction (<0.5%) in efficiency for continuous operation. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ENERGY storage
*PULSED power systems
*ENERGY density
*COMPRESSED air
*PNEUMATICS
Subjects
Details
- Language :
- English
- ISSN :
- 03062619
- Volume :
- 155
- Database :
- Academic Search Index
- Journal :
- Applied Energy
- Publication Type :
- Academic Journal
- Accession number :
- 108845207
- Full Text :
- https://doi.org/10.1016/j.apenergy.2015.06.019