STUDY AND OPTIMIZATION OF CHARGING CHARACTERISTICS OF HIGH-TEMPERATURE SOLID HEAT STORAGE DEVICE

Liu Xu; Xu Lijun; Liu Jiajia; Chou Peng; Wang Gang

doi:10.19912/j.0254-0096.tynxb.2024-0881

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (9) : 342-350. DOI: 10.19912/j.0254-0096.tynxb.2024-0881

STUDY AND OPTIMIZATION OF CHARGING CHARACTERISTICS OF HIGH-TEMPERATURE SOLID HEAT STORAGE DEVICE

Liu Xu¹, Xu Lijun², Liu Jiajia³, Chou Peng⁴, Wang Gang²

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Abstract

The high-temperature solid heat storage device is made up of many heat storage units. Before investigating the whole heat storage device, the thermal characteristics of the unit should be revealed. In this paper, the heat transfer defect inside the heat storage device is revealed after analyzing its thermal characteristics. After 8 h of charging, the maximum temperature difference is about 60 K. The charging characteristic is influenced by the position of the heating element significantly. In 3 cases, the temperature distribution becomes worse as the heating element moves down. The heat storage unit has a minimum temperature difference of 20 K when the heating element is placed at the center of the unit. During charging, the radiation is the main heat transfer method, about 95% of heat is transferred by radiation. The air path volume proportion of the unit also influences the thermal characteristics. To get better temperature distribution, the proportion should be larger. But to get higher energy storage density, the proportion should be lower.

Key words

solid sensible heat storage / radiative heat transfer / temperature uniformity / shared energy storage / energy storage density / simulation-based optimization

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Liu Xu, Xu Lijun, Liu Jiajia, Chou Peng, Wang Gang. STUDY AND OPTIMIZATION OF CHARGING CHARACTERISTICS OF HIGH-TEMPERATURE SOLID HEAT STORAGE DEVICE[J]. Acta Energiae Solaris Sinica. 2025, 46(9): 342-350 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0881

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