EFFECT OF THERMAL STORAGE TEMPERATURE ON EFFICIENCY OF PUMPED THERMAL ELECTRICITY STORAGE SYSTEM

Wang Jihui; Bai Ning; Shen Feng

doi:10.19912/j.0254-0096.tynxb.2022-0351

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (7) : 48-54. DOI: 10.19912/j.0254-0096.tynxb.2022-0351

EFFECT OF THERMAL STORAGE TEMPERATURE ON EFFICIENCY OF PUMPED THERMAL ELECTRICITY STORAGE SYSTEM

Wang Jihui, Bai Ning, Shen Feng

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Abstract

Pumped thermal electricity storage （PTES） technology can alternately utilize heat pump and heat engine cycles to achieve energy storage and power generation. It requires heat and cold mediums to store thermal and cryogenic energy. In the process of energy storage, the low-temperature heat medium absorbs heat and then becomes high-temperature heat medium. In the process of power generation, the high-temperature heat medium reverts to low-temperature heat medium by releasing heat. The heat medium temperature determines the temperature ratios of compressors and turbines, and thus has a great influence on the round-trip efficiency of the PTES system. In this paper, a PTES system based on closed Brayton cycle is calculated and analyzed. It is concluded that the system round-trip efficiency can be improved by increasing the temperature of high-temperature heat medium, while it increases first and then decreases with reducing the temperature of the low-temperature heat medium. Given the equipment efficiencies and losses, when the temperature of the high-temperature heat medium is 550 ℃, the optimal temperature of the low-temperature heat medium is 310 ℃, leading to the highest system round-trip efficiency of 61.36%. The efficiency inflection point is mainly due to that the energy storage power varies almost linearly with the temperature of the low-temperature heat medium, while the generated electricity power is approximately a quadratic function of the temperature of the low-temperature heat medium.

Key words

electric energy storage / heat pump / thermal storage / efficiency / Brayton cycle

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Wang Jihui, Bai Ning, Shen Feng. EFFECT OF THERMAL STORAGE TEMPERATURE ON EFFICIENCY OF PUMPED THERMAL ELECTRICITY STORAGE SYSTEM[J]. Acta Energiae Solaris Sinica. 2023, 44(7): 48-54 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0351

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