Thermodynamic Analysis of a Novel Compressed Supercritical Carbon Dioxide Energy Storage System

Abstract

To improve the thermodynamic efficiency of compressed air energy storage system, a novel compressed gas energy storage system using supercritical carbon dioxide was proposed. Energy and exergy analyses were used to study the thermodynamic performance of the novel energy storage system. The thermodynamic analysis results show that the energy storage system based on supercritical CO2 has a better performance and simpler system configurations compared with CAES (Compressed Air Energy Storage, CAES). The exergy efficiency and round trip efficiency of compressed supercritical CO2 energy storage system are 57.02% and 73.02%, respectively. And the highest exergy destruction occurs in the recuperator, accounting 36.51% of the total system exergy destruction, followed by the heater (32.33%) and then turbine, low-pressure reservoir etc.