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An adiabatic compressed air plant improves on the diabatic arrangement by

  • A.storing the heat of compression for use on discharge
  • B.compressing the air in a single stage
  • C.using a larger cavern for the same energy
  • D.operating at a lower pressure throughout

Answer: A

Keeping the compression heat in a thermal store and returning it to the air before expansion removes the need for any fuel and lifts the round trip efficiency substantially. The thermal store is the difficult and costly component.

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