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 a solar energy pile-soil system work?
The heat-carrying fluid particle transports heat from the solar collector to the energy pile-soil system continuously. The rate of charging and discharging depends on the flowrate, the intensity of radiation, and the condition of the energy pile-soil system.
How much energy is stored per unit pile?
Quantitatively, the daily average rate of energy storage per unit pile length reaches about 200 W/m for the case in saturated soil with turbulent flowrate and high-level radiation. This is almost 4 times that in the dry soil. Under low-level radiation, it is about 60 W/m.
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.
What is the irradiance of a solar energy pile-soil system?
The two levels of radiation represent abundant and deficient availability of solar energy with respect to the size of the model energy pile-soil system, respectively. The irradiance was measured using a pyranometer with a precision of 0.2 W/m 2.
How many cycles are there in solar energy storage?
The stage of solar energy storage has five cycles, and each cycle consists of an eight-hour charging phase and a sixteen-hour recovery phase. This is based on the consideration that the solar radiation in practice is intermittent.
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