Deng Zhang

Performance analysis of liquid air energy storage utilizing LNG cold energy

As the high energy density and can be stored in a long period, the liquid air is regarded as the potential energy storage medium. In the liquid air energy storage (LAES) system, liquid air is produced in the liquefaction processes by using the renewable energy or off-peak energy. The compressor is used to supply and recycle the air in liquefaction processes. In this paper, a LAES model is established, and the impact of compressor on LAES system is analysed theoretically. Liquid air energy storage (LAES) system utilizing LNG cold energy is also described. The results show that the round trip energy efficiency is enhanced and the utilizing has promising application prospect for large scale energy storage.

A novel liquid air energy storage in high-pressure state

Compared with compressed air energy storage, liquid air energy storage has the advantage of higher energy density, smaller storage volume. In this study, it describes a novel liquid air energy storage system, the air is liquefied and stored with high pressure. The system uses a regenerator for air liquefaction and energy is recovered through throttled liquid air, so extra refrigeration process is unnecessary. Thermodynamic analysis of the systems performance is also presented. The results show that the efficiency of liquid air energy storage system is high and there is enough space for optimization with different working pressure.