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[Energy] Common energy storage technology methods: thermal energy storage and chemical energy storage

Thermal Energy Storage Basic Principles In a thermal energy storage system, thermal energy is stored in a medium in a thermally insulated container and can be converted back into electrical energy later when needed, or it can be used directly without being converted back into electrical energy.

There are many different technologies for thermal energy storage, which can be further divided into sensible heat storage and latent heat storage, among others. In the sensible heat storage method, the medium used for heat storage can be liquid water, and the hot water can be used directly or for room heating, etc. The temperature of the hot water changes during operation. Latent heat storage is accomplished through phase change materials, which are the medium for storing heat energy.


Thermal energy storage requires various high-temperature chemical and thermal working fluids, and the application occasions are relatively limited.

——— Chemical energy storage

Chemical energy storage mainly refers to the use of hydrogen or synthetic natural gas as the carrier of secondary energy. Hydrogen is produced by using excess electricity during the low load period, and water is decomposed into hydrogen and oxygen by electrolysis to obtain hydrogen. In the future, hydrogen can be directly used as an energy carrier, and then hydrogen and carbon dioxide can be reacted to form synthetic natural gas (methane), and synthetic natural gas can be used as another secondary energy carrier.