Abstract
In order to increase the cycle efficiency of compressed air energy storage, a novel advanced adiabatic compressed air energy storage system with variable pressure ratio based on organic Rankine cycle is presented. The thermodynamic model of the system is established and used to calculate the thermodynamic characteristics of system vs the number of expanders and their linked mode. Then, the system based on organic Rankine cycle subsystem was analysed. The results show that the system with variable pressure ratio reduces the compression process power consumption by 12.45% and increases the expander output power by 37.29% comparing with the advanced adiabatic compressed air energy storage, which make the cycle efficiency of the system increase from 40.16% up to 63.00%. Furtherly, the cycle efficiency of the system coupled organic Rankine cycle reached 70.53%.
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