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Compressed air energy storage method and system

  • US 5,537,822 A
  • Filed: 03/23/1994
  • Issued: 07/23/1996
  • Est. Priority Date: 02/03/1994
  • Status: Expired due to Fees
First Claim
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1. A compressed air energy storage system comprising:

  • a compressed air reservoir;

    a plurality of air compressor stages adapted for compression of atmospheric air;

    means for cooling air compressed in said air compressor stages;

    means for separating condensed water from said compressed atmospheric air;

    at least one air expander adapted for expansion of compressed air;

    heat transfer means for preheating said compressed air before expansion and heating expanded air egressing from said air expander, using heat derived from one of the class of external low grade heat sources including refrigerated substances, surrounding water, surrounding air, waste heat sources and solar energy;

    an electric motor-generator unit connected through clutches to said air compressor stages and air expander;

    lines with valves connecting said air compressor stages with said air expander and with said compressed air reservoir.

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