Compression of air creates heat; the air is warmer after compression. Expansion removes heat. If no extra heat is added, the air will be much colder after expansion. If the heat generated during compression can be stored and used during expansion, then the efficiency of the storage improves considerably. There are several ways in which a CAES system can deal with heat. Air storage can be , diabatic, , or near-isothermal.
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According to the U.S. Department of Energy, three-quarters of American homes have air conditioners. The energy used by power plants to support that many air conditioners produces 117 million metric ton.
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