An energy storage system that stores energy in the form of liquid air has been studied. In this system, the thermal storage regenerator recovers cold heat from liquid air during the daytime, and it is utilized to produce the liquid air during the nighttime. The energy storage efficiency is greatly improved by th regenerator that consists of steel pipes inserted in a concrete medium. A computer code, that simulates unsteady-state heat transfer between air and a concrete medium, was developed. The calculation results showed the good agreement with the experimental results. The required volume of the concrete regenerator was less than 1/100 of that of reservoirs for a pumped-hydro power station.
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