Medium and deep energy storage

What is medium deep borehole heat exchanger?

The storage of heat via medium deep borehole heat exchangers is a new approach in the field of Borehole Thermal Energy Storage. In contrast to conventional borehole storages, fewer, but deeper borehole heat exchangers tap into the subsurface, which serves as the storage medium.

Why is seasonal energy storage important?

Seasonal energy storage is an important component to cope with the challenges resulting from fluctuating renewable energy sources and the corresponding mismatch of energy demand and supply. The storage of heat via medium deep borehole heat exchangers is a new approach in the field of Borehole Thermal Energy Storage.

Can thermal energy be extracted from medium-deep borehole heat exchangers?

This paper presents numerical calculations of the thermal energy that can be extracted from the medium-deep borehole heat exchangers in the low-enthalpy geothermal setting at depths ranging from 600 to 3000 m.

What is borehole thermal energy storage (BTES)?

Addressing the seasonal and fluctuating energy supply challenges posed by renewable energy sources, such as solar thermal energy, the utilization of borehole thermal energy storage (BTES) emerges as a promising technology (Homuth et al., 2012).

How efficient is seasonal heat storage?

The results indicate that especially larger systems have a high potential for efficient seasonal heat storage. Several GWh of thermal energy can be stored during summertime and extracted during the heating period with a high recovery rate of up to 83%.

Are medium-deep geothermal boreholes a reliable baseload energy source?

We demonstrate that understanding the interplay of the local geology, heat exchanger materials, and fluid circulation rates is necessary to maximize the potential of medium-deep geothermal boreholes as a reliable long-term baseload energy source.