Electrothermal Energy Storage System Based on Supercritical Carbon Dioxide Cycle

Kaiyun ZHENG

doi:10.16513/j.2096-2185.DE.2006007

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Distributed Energy ›› 2020, Vol. 5 ›› Issue (5) : 43-47. DOI: 10.16513/j.2096-2185.DE.2006007

Application Technology

Electrothermal Energy Storage System Based on Supercritical Carbon Dioxide Cycle

Kaiyun ZHENG

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Abstract

Supercritical carbon dioxide cycle has many advantages, such as wide application range, high efficiency, simple system and compact equipment. Energy storage is one of the potential application fields of supercritical carbon dioxide cycle. In view of the urgent demand of large-scale power energy storage development, the conceptual design of electric thermal energy storage system based on supercritical carbon dioxide cycle is proposed. Using copper as phase change heat storage material and supercritical carbon dioxide cycle as thermoelectric conversion device, the energy storage system designs of recompression supercritical carbon dioxide cycle and simple regenerative supercritical carbon dioxide cycle mode are established, and the energy storage efficiency is analyzed by thermodynamic method. The results show that the energy storage efficiency of the electric thermal energy storage system based on supercritical carbon dioxide cycle is expected to reach 60%, and combined with low-temperature waste heat recovery, the energy storage efficiency can be further improved to 67%. And, the electric thermal energy storage system has good economy. Therefore, the electric thermal energy storage system based on supercritical carbon dioxide cycle can be used to construct large-scale electric energy storage system.

Key words

supercritical carbon dioxide cycle / electrothermal energy storage / energy storage efficiency / phase change heat storage

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Kaiyun ZHENG. Electrothermal Energy Storage System Based on Supercritical Carbon Dioxide Cycle[J]. Distributed Energy Resources. 2020, 5(5): 43-47 https://doi.org/10.16513/j.2096-2185.DE.2006007

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