Method for storing and production energy by means of compressed air with additional energy recovery

A compressed-air energy storage and production method comprising the following steps:

• a) compression of the air by staged compressors (K-101, K-102, K-103, K-104), during which cooling of the air is performed after at least one compression stage through exchange with a heat transfer fluid (C-101, C-102, C-103, C-104),
• b) storage of the compressed air and of the hot heat transfer fluid after exchange during compression,
• c) staged expansions of the air by power generation turbines (EX-201, EX-202, EX-203, EX-204), during which heating of the air is performed after at least one expansion stage by the hot heat transfer fluid from the storage (C-101, C-102, C-103, C-104),
• characterized in that, after heating the expanded air and prior to being recycled to the compression step, the transfer fluid is cooled by an additional energy recovery loop comprising a pump (P-501), an exchanger (E-501) and a turbine (EX-501), as well as an additional heat transfer fluid.