Energy storage charging piles have high temperatures in summer

What is the temperature range of the energy pile?

In this study, temperature changes of the energy pile were constrained to be within a range of 5–40 °C. This range serves as an input into the thermo-mechanical analysis of the energy pile foundation, resulting in a one-way coupling between the thermal analysis of the whole system and the thermo-mechanical analysis of the energy pile foundation.

Does pile length underestimate the rate of heat exchange?

As shown in Fig. 5 (a), for the case in unfavourable ground conditions, the computed results corresponding to the actual pile length of 30 m underestimated the daily-averaged rate of heat exchange by about 25% for both the modes of heat extraction and injection. To improve the situation, an equivalent pile length was calibrated.

What is an energy pile?

The energy pile represents an embedment of heat exchange pipes into the pile body. In this way, it can serve as a vertical heat exchanger in addition to its primary function of supporting the building. The additional land use and construction costs related to the conventional vertical boreholes of the GSHP system can thus be saved.

What is the thermal conductivity of the energy pile?

The thermal conductivity of the concrete of the tested energy pile was about 1.5 W/m/°C, slightly less than the adopted value of 1.6 W/m/°C in this study. On consideration of these differences, the calculated value of 0.035 (m °C)/W for the energy pile under study was justified to be reasonable.

Does a 30 m pile increase heat exchange rate?

Computed results for the case in favourable ground conditions using an equivalent pile length did not show a uniform improvement on that using the original pile length of 30 m. In addition, this slight underestimation of the heat exchange rate will put the system design on the conservative side.

Can geothermal energy piles sustainably climatize buildings?

A critical review on the current knowledge of geothermal energy piles to sustainably climatize buildings Renew. Sustain. Energy Rev., 158 ( 2022), Article 112072, 10.1016/j.rser.2022.112072 An investigation of the heat pump performance and ground temperature of a piled foundation heat exchanger system for a residential building