Can solar thermal energy be stored underground?
Energy piles, which embed thermal loops into the pile body, have been used as heat exchangers in ground source heat pump systems to replace traditional boreholes. Therefore, it is proposed to store solar thermal energy underground via energy piles.
Are solar energy storage systems underground?
The experience of USTES applications worldwide in recent years shows that most of the solar energy seasonal storage projects have significant economic, social and environmental benefits. However, the key part of solar energy storage system is underground.
Can energy piles store solar thermal energy underground?
Ma and Wang proposed using energy piles to store solar thermal energy underground in summer, which can be retrieved later to meet the heat demands in winter, as schematically illustrated in Fig. 1. A mathematical model of the coupled energy pile-solar collector system was developed, and a parametric study was carried out.
How does underground thermal energy storage work?
The conventional practice of underground thermal energy storage is burying heat exchange pipes into pre-drilled vertical holes, referred to as the borehole thermal energy storage . Heat transfer occurs by circulating heat carrier fluid through the pipes. However, the cost of drilling deep holes can cause a breakdown of a project .
What are the advantages of underground thermal energy storage?
Of the common sensible mediums for thermal energy storage, the ground enjoys the advantage of enormous quantity and being widely accessible , . The conventional practice of underground thermal energy storage is burying heat exchange pipes into pre-drilled vertical holes, referred to as the borehole thermal energy storage .
How does underground solar energy storage change over time?
Overall, the daily average rate of underground solar energy storage decreases over time due to a gradual heat build-up in the soil. This decline is most notable within the first month. At the very beginning, there is almost no difference between cases in different soils.
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Download scientific diagram | Underground thermal energy storage (UTES) methods (modified after Publication 3). from publication: Techno-economic aspects of seasonal underground storage of solar ...
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In this study, thermal performance of an energy pile-solar collector coupled system for underground solar energy storage was investigated using numerical modeling. The results suggested that a lower flow rate should be adopted for the energy pile-solar collector coupled system to save the operational cost of the circulation pump. For the case ...
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A review of available technologies for seasonal thermal energy storage. Solar Energy, 103: 610−638. DOI: 10.1016/j.solener.2013.06.006. Xu LY, Torrens JI, Guo F, et al. 2018. Application of large underground seasonal thermal energy storage in district heating
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This approach can also be combined with solar thermal energy." ... Laboratory Directed Research and Development Program, renewable energy, supercritical CO 2, underground energy storage. For further information contact Tom Buscheck (925) 423-9390 (buscheck1 [at] llnl.gov (buscheck1[at]llnl[dot]gov)).
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Seasonal heat storage in the ground, commonly known as underground thermal energy storage (UTES), is typically a low temperature storage in which the heat is mainly used to compensate the yearly thermal imbalance or increase the ground temperature in a few degrees K in order to increase the heat pump COP [20]. High temperature storage is ...
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