ANALYSIS OF HEAT DISSIPATION CHARACTERISTICS OF BURIED THERMAL STORAGE WATER PIT DURING STANDBY PERIOD FOR SOLAR HEATING SYSTEMS

Xu Li; Li Yong; Liu Yanfeng; Liang Yuxiang; Wang Dengjia

doi:10.19912/j.0254-0096.tynxb.2024-0363

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (7) : 733-740. DOI: 10.19912/j.0254-0096.tynxb.2024-0363

Special Topics of Academic Papers at the 106th Annual Meeting of the China Association for Science and Technology

ANALYSIS OF HEAT DISSIPATION CHARACTERISTICS OF BURIED THERMAL STORAGE WATER PIT DURING STANDBY PERIOD FOR SOLAR HEATING SYSTEMS

Xu Li¹, Li Yong^1,2, Liu Yanfeng^1,2, Liang Yuxiang¹, Wang Dengjia^1,2

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Abstract

A three-dimensional transient model of pit thermal energy storage （PTES） with an inverted pyramid shape is established and verified using measured results from a PTES system in Langkazi County, Tibet. The influence of geometric shape on thermal performance of PTES during the standby period is studied. The results indicate that with a PTES height of 10 m, the natural convection heat transfer intensity at the top and side of PTES decreases with an increase in the slope angle, while the natural convection heat transfer intensity at the bottom increases. For the height of PTES less than or equal to 10 m, the total heat loss of PTES decreases with the increase in the slope angle. The optimal heat storage efficiencies of PTES is achieved when the slope angles are 30°, 60°, and 90°, and the heights are 12 m, 10 m, and 10 m, respectively. After a standby period for 60 hours, with a PTES height of 10 m and a slope angle of 60°, the highest heat storage efficiency is achieved.

Key words

solar energy / heat storage / efficiency / water body heigh / slope angle

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Xu Li, Li Yong, Liu Yanfeng, Liang Yuxiang, Wang Dengjia. ANALYSIS OF HEAT DISSIPATION CHARACTERISTICS OF BURIED THERMAL STORAGE WATER PIT DURING STANDBY PERIOD FOR SOLAR HEATING SYSTEMS[J]. Acta Energiae Solaris Sinica. 2025, 46(7): 733-740 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0363

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