Efficiency of Compressed Air Energy Storage

Brian Elmegaard, Wiebke Brix

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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
    Country/TerritorySerbia
    CityNovi Sad
    Period04/07/201107/07/2011

    Keywords

    • Exergy analysis
    • Electricity storage
    • Compressed Air Energy Storage

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