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Compressed air-brine energy storage

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  • Loeb, Sidney

Abstract

Compressed air-brine energy storage (CABES) is similar to ordinary compressed air energy storage (CAES). However, in CABES, the heat of compression of the air is stored via a surface-type heat exchanger in water or, preferably, concentrated brine contained in an unpressurized reservoir. Furthermore, the brine is stratified into a hot, lower density, upper layer and a cold, higher density, lower layer, thus eliminating half the needed reservoir volume. In the energy delivery phase the hot brine heats the compressed air prior to its expansion through an expander/generator to recover the stored electric energy. Calculations on a three-stage CABES plant indicate that: 1.(1) the overall electric efficiency is at least 67%;2.(2) the energy storage density of the brine is 0.016 m3 per electric kWh delivered from storage;3.(3) the required unit heat transfer surface is 0.27 m2 per electric kWh;4.(4) the contribution of the reservoir and heat exchanger costs to the cost of electric energy delivered from storage is not excessive.

Suggested Citation

  • Loeb, Sidney, 1988. "Compressed air-brine energy storage," Energy, Elsevier, vol. 13(2), pages 183-190.
    • Handle: RePEc:eee:energy:v:13:y:1988:i:2:p:183-190
    DOI: 10.1016/0360-5442(88)90044-8
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