Data of short-term thermal energy storage strategy with medium-deep borehole heat exchanger

This dataset presents the heating performance of an innovative short-term thermal energy storage strategy with the Medium-Deep Borehole Heat Exchanger (MDBHE). The existing thermal energy storage strategy is long-term, which charges the thermal energy into the underground during the non-heating season and discharges the thermal energy during the heating season via the MDBHE. The long-term thermal energy storage suffers from a low energy storage efficiency due to the cross-season heat dissipation from the energy-storage zone to the surrounding soil. The proposed short-term thermal energy storage strategy extends the thermal energy storage resource of the MDBHE from the non-heating season to the heating season, which alternatively switches the energy-charging and energy-discharging modes during the heating season. Since the thermal interaction time between the energy-storage zone and the surrounding soil is limited to the switching period (i.e., one day in the demonstration scenarios with different charging temperatures and charging-discharging ratios), the proposed strategy achieves high charging and discharging efficiencies, leading to high overall energy-storage efficiency and large heating capacity. This study presents data on the heating performance of the proposed strategy, including the soil temperature, inlet and outlet temperatures, heating capacity, and energy storage efficiency under different scenarios, as well as the comparative results with the traditional intermittent operation of the MDBHE without thermal energy storage and the existing long-term thermal energy storage of the MDBHE.