Evaluation of energy storage method using liquid air

An energy storage system using liquid air for high storage efficiency is studied. Liquid air is produced by off-peak power and can be stored at atmospheric pressure in a large tank. When on-peak power is needed, the stored liquid air is pumped to high pressure and fed to the combustor of a gas turbine. Then, power generation is more than doubled from that of a system with an ordinary air compressor. Furthermore, energy storage efficiency of this system is significantly increased above that of a pumping-up power plant when low-temperature liquid air is used to produce new liquid air.