Efficiency of Compressed Air Energy Storage

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Abstract

The simplest type of a Compressed Air Energy Storage (CAES) facility would be an adiabatic process consisting only of a compressor, a storage and a turbine, compressing air into a container when storing and expanding when producing. This type of CAES would be adiabatic and would if the machines were reversible have a storage efficiency of 100%. However, due to the specific capacity of the storage and the construction materials the air is cooled during and after compression in practice, making the CAES process diabatic. The cooling involves exergy losses and thus lowers the efficiency of the storage significantly. The efficiency of CAES as an electricity storage may be defined in several ways, we discuss these and find that the exergetic efficiency of compression, storage and production together determine the efficiency of CAES. In the paper we find that the efficiency of the practical CAES electricity storage is 25-45% and thus has a quite low efficiency, which is close to the efficiency of the simple diabatic CAES-process. Adiabatic CAES would reach significantly higher storage efficiency about 70-80%.
Original languageEnglish
Title of host publicationThe 24th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems : The 2011 conference motto: International Smart Energy Networks of Cooperation for Sustainable Development
Publication date2011
Publication statusPublished - 2011
Event24th International Conference on Efficiency, Cost, Optimization,Simulation and Environmental Impact of Energy Systems - Novi Sad, Serbia
Duration: 4 Jul 20117 Jul 2011
Conference number: 24

Conference

Conference24th International Conference on Efficiency, Cost, Optimization,Simulation and Environmental Impact of Energy Systems
Number24
CountrySerbia
CityNovi Sad
Period04/07/201107/07/2011

Keywords

  • Exergy analysis
  • Electricity storage
  • Compressed Air Energy Storage

Cite this

Elmegaard, B., & Brix, W. (2011). Efficiency of Compressed Air Energy Storage. In The 24th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems: The 2011 conference motto: International Smart Energy Networks of Cooperation for Sustainable Development
Elmegaard, Brian ; Brix, Wiebke. / Efficiency of Compressed Air Energy Storage. The 24th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems: The 2011 conference motto: International Smart Energy Networks of Cooperation for Sustainable Development. 2011.
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title = "Efficiency of Compressed Air Energy Storage",
abstract = "The simplest type of a Compressed Air Energy Storage (CAES) facility would be an adiabatic process consisting only of a compressor, a storage and a turbine, compressing air into a container when storing and expanding when producing. This type of CAES would be adiabatic and would if the machines were reversible have a storage efficiency of 100{\%}. However, due to the specific capacity of the storage and the construction materials the air is cooled during and after compression in practice, making the CAES process diabatic. The cooling involves exergy losses and thus lowers the efficiency of the storage significantly. The efficiency of CAES as an electricity storage may be defined in several ways, we discuss these and find that the exergetic efficiency of compression, storage and production together determine the efficiency of CAES. In the paper we find that the efficiency of the practical CAES electricity storage is 25-45{\%} and thus has a quite low efficiency, which is close to the efficiency of the simple diabatic CAES-process. Adiabatic CAES would reach significantly higher storage efficiency about 70-80{\%}.",
keywords = "Exergy analysis, Electricity storage, Compressed Air Energy Storage",
author = "Brian Elmegaard and Wiebke Brix",
year = "2011",
language = "English",
booktitle = "The 24th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems",

}

Elmegaard, B & Brix, W 2011, Efficiency of Compressed Air Energy Storage. in The 24th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems: The 2011 conference motto: International Smart Energy Networks of Cooperation for Sustainable Development. 24th International Conference on Efficiency, Cost, Optimization,Simulation and Environmental Impact of Energy Systems, Novi Sad, Serbia, 04/07/2011.

Efficiency of Compressed Air Energy Storage. / Elmegaard, Brian; Brix, Wiebke.

The 24th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems: The 2011 conference motto: International Smart Energy Networks of Cooperation for Sustainable Development. 2011.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

TY - GEN

T1 - Efficiency of Compressed Air Energy Storage

AU - Elmegaard, Brian

AU - Brix, Wiebke

PY - 2011

Y1 - 2011

N2 - The simplest type of a Compressed Air Energy Storage (CAES) facility would be an adiabatic process consisting only of a compressor, a storage and a turbine, compressing air into a container when storing and expanding when producing. This type of CAES would be adiabatic and would if the machines were reversible have a storage efficiency of 100%. However, due to the specific capacity of the storage and the construction materials the air is cooled during and after compression in practice, making the CAES process diabatic. The cooling involves exergy losses and thus lowers the efficiency of the storage significantly. The efficiency of CAES as an electricity storage may be defined in several ways, we discuss these and find that the exergetic efficiency of compression, storage and production together determine the efficiency of CAES. In the paper we find that the efficiency of the practical CAES electricity storage is 25-45% and thus has a quite low efficiency, which is close to the efficiency of the simple diabatic CAES-process. Adiabatic CAES would reach significantly higher storage efficiency about 70-80%.

AB - The simplest type of a Compressed Air Energy Storage (CAES) facility would be an adiabatic process consisting only of a compressor, a storage and a turbine, compressing air into a container when storing and expanding when producing. This type of CAES would be adiabatic and would if the machines were reversible have a storage efficiency of 100%. However, due to the specific capacity of the storage and the construction materials the air is cooled during and after compression in practice, making the CAES process diabatic. The cooling involves exergy losses and thus lowers the efficiency of the storage significantly. The efficiency of CAES as an electricity storage may be defined in several ways, we discuss these and find that the exergetic efficiency of compression, storage and production together determine the efficiency of CAES. In the paper we find that the efficiency of the practical CAES electricity storage is 25-45% and thus has a quite low efficiency, which is close to the efficiency of the simple diabatic CAES-process. Adiabatic CAES would reach significantly higher storage efficiency about 70-80%.

KW - Exergy analysis

KW - Electricity storage

KW - Compressed Air Energy Storage

M3 - Article in proceedings

BT - The 24th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems

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Elmegaard B, Brix W. Efficiency of Compressed Air Energy Storage. In The 24th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems: The 2011 conference motto: International Smart Energy Networks of Cooperation for Sustainable Development. 2011