Volume 64

Compressed CO2 energy storage using high-temperature TES for isolated islands Yuemao Jiang, Shunsen Wang, Haotian Zhao, Bo Li

Abstract

Isolated islands have a high potential for renewable energy exploitation due to their unique geography. However, the intermittency of these resources requires energy storage systems to ensure a reliable power supply. This study proposes an advanced compressed CO2 energy storage system integrating a high-temperature thermal energy storage (TES) architecture for isolated island applications. The system exploits seawater static pressure and ocean thermal energy to enable liquid CO2 isobaric storage, while employing pressurized water and molten salt in a dual-loop TES configuration. Thermodynamic design and performance of the system are modelled under realistic assumptions for all components. A parametric analysis is then conducted to investigate the effects of key parameters on the overall system performance. Results show that the system can achieve a round-trip efficiency of 74.7% and a storage density of 61.1 kWh/m³, provided that an appropriate seawater depth is available. This study offers valuable insights for advancing CCES systems.

Keywords isolated island, compressed CO2 energy storage, ocean thermal energy, thermal energy storage