Technical FAQs 4

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.

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.

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 temperature affect the rate of underground solar energy storage?

Rate of underground solar energy storage Temperature difference between circulating water and surrounding soil drives heat transfer between them. Therefore, the rate of energy storage evolves with the variations of the inlet temperature of the energy pile and the soil temperature.

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Working principle of underground solar energy storage cabinet station

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