STUDY ON THERMAL PERFORMANCE OF SINGLE-TANK COMPOSITE CERAMIC PACKED BED HEAT STORAGE SYSTEM

Xu Jiakun; Yang Xiaohong; Zhang Yannan; Zhang Xinyu; Zhang Yixuan

doi:10.19912/j.0254-0096.tynxb.2023-1217

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (11) : 655-662. DOI: 10.19912/j.0254-0096.tynxb.2023-1217

STUDY ON THERMAL PERFORMANCE OF SINGLE-TANK COMPOSITE CERAMIC PACKED BED HEAT STORAGE SYSTEM

Xu Jiakun¹, Yang Xiaohong^1~3, Zhang Yannan¹, Zhang Xinyu¹, Zhang Yixuan¹

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Abstract

Based on the 1 kW β-type dish solar Stirling power generation system, a three-dimensional and transient numerical model of single-tank packed bed heat storage is established. Ceramic-graphite composite materials were synthesized using various proportions, and their thermophysical and mechanical properties were characterized. Based on the analysis, a composite material with a blast furnace slag to graphite ratio of 8∶2 was selected as the optimal storage tank filler. Results demonstrate that, compared to pure water thermal storage tanks, the incorporation of this filler reduced the thermocline thickness by 37.5-70.0 mm under various initial conditions, while improving the heat storage and release efficiency by approximately 6%. Through dimensional analysis using the π theorem and multiple regression methods, we established a mathematical model correlating thermocline thickness with initial conditions. The study further analyzed the influences of inlet velocity, temperature differential during heat storage, tank height-to-diameter ratio, and packing characteristics on the thermocline thickness. This analysis yielded a dimensionless functional relationship for the thermocline thickness ratio. The findings indicate that increasing inlet flow rate and reducing particle size results in shorter thermal equilibrium times during the heat storage process.

Key words

solar energy / Stirling power generation system / ceramic matrix composites / thermal storage / thermocline / heat storage efficiency / dimensional analysis

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Xu Jiakun, Yang Xiaohong, Zhang Yannan, Zhang Xinyu, Zhang Yixuan. STUDY ON THERMAL PERFORMANCE OF SINGLE-TANK COMPOSITE CERAMIC PACKED BED HEAT STORAGE SYSTEM[J]. Acta Energiae Solaris Sinica. 2024, 45(11): 655-662 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1217

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