Design and optimization of large-scale seasonal borehole thermal energy storage system for solar energy

被引：0
|
作者：
Wang C. [1 ]
Guo F. [1 ]
Zhu Y. [2 ]
Yang X. [3 ]
机构：
[1] School of Resources, Environment and Architectural Engineering, Chifeng University, Chifeng
[2] Beijing Common Environment Limited, Beijing
[3] School of Architecture, Tsinghua University, Beijing
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2021年 / 42卷 / 04期
关键词：
District heating; Economic analysis experiment; Seasonal thermal energy storage; Solar energy;
D O I：
10.19912/j.0254-0096.tynxb.2019-1432
中图分类号：
学科分类号：
摘要：
A new solar seasonal thermal storage system was designed and integrated with the urban central heating network. The simulation model of the system was built in TRNSYS. The correlation among the storage volume of the seasonal thermal energy storage system, the water tank volmem ofshort-term thermal storage system and the inner circulation flowrate of the borehole heat exchanger was studied. By using the Hooke-Jeeves algorithm, the optimal correlation between collector area and other system design parameters were obtained. The optimization results indicate that there is a scale threshold for implementing solar seasonal thermal storage. Borehole thermal storage with larger storage volume and compact shape are more beneficial for heat loss protection. For a borehole thermal storage with 1-1 height-to-diameter ratio, 80℃ inlet temperature for heat injection and 20℃ inlet temperature for heat extraction, the volume-to-area ratio decreases from 0.3 to 0.13, and the storage efficiency increases from 40% to 75% with storage volume increasing from 10000 to 100000 m3. In addition, the short-term storage volume had significant effect on system performance. When short-term storage volume failed to compensate the transient excessive heat, the operation temperature of the solar water heating system tended to increase, resulting in the reduction in solar collection efficiency. Correlating the total collection area, storage volume and circulation flowrate according to the dynamic performance of the system is important for system design. The results of economic analysis showed that the optimal solar collection area is around 1750 to 2500 m2 for the studied system. With this configuration, the lowest annual cost (around 92 RMB/GJ) were achieved. © 2021, Solar Energy Periodical Office Co., Ltd. All right reserved.
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页码：320 / 327
页数：7
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