Abstract
Medium-shallow array borehole heat exchangers (MSABHEs) exhibit high heat transfer capacity and low initial investments. However, limited research has been conducted on utilizing medium-shallow geothermal energy utilization for heating and cooling. In this study, a heat transfer model for MSABHEs was established. Second, the suitability of the heat transfer model was validated using experimental data. Subsequently, the model was used to analyze the impacts of the borehole spacing, terrestrial heat flow, circulating fluid flow rate, and ground depth on heat transfer in MSABHEs. Finally, an optimization strategy for the circulating fluid was proposed based on dynamic building loads, and the impacts of various circulating liquid control strategies on the heat pump performance were compared. The results indicated that the heat transfer capacity of the MSABHEs increased with increasing borehole spacing. When the spacing was greater than 8 m, thermal interference between the boreholes could be ignored. Under the condition of imbalanced cooling and heating loads, the variable flow strategy could increase the heating coefficient of performance (COP) and cooling COP of the heat pump by approximately 11.12 % and 14.28 %, respectively. Through this control method, the power consumption of the water pump could be reduced from 15840 kW to 8527 kW. These findings could provide a theoretical basis and technical guidance for MSABHE applications.
Published Version
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