Energy on demand

Energy on demand
When heated, the storage medium (slaked lime) begins an endothermic reaction that starts at approximately 450 degrees Celsius and creates calcium oxide. Roughly 20 percent of the input is stored in the form of sensible energy and the rest as chemical energy. Depending on the insulation, the sensible energy can slowly be lost over a prolonged period of time, but the chemical energy is storable for an unlimited amount of time and is released only when needed. For this purpose, steam is fed in to cause a strongly exothermic reaction that releases the heat again.
Credit:

DLR (CC-BY 3.0).

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