Long-term performance simulation analysis of solar-assisted borehole thermal energy storage combined with a heat pump heating system

Xiaozhe Wang, Hao Zhang, Pengchao Zang, Lin Cui, Pei Zhao, Jiyun Tang, Jingying Wang, Chunhian Lee and Yong Dong

Renewable Energy, 2025, vol. 252, issue C

Abstract: Borehole thermal energy storage can avoid the diurnal and seasonal mismatch between energy supply and demand, making it an effective way to utilize renewable energy for heating. This study proposes a heating solution that integrates solar-assisted borehole thermal seasonal energy storage (SABTES) with a heat pump system, which targets the dynamic thermal load demands of buildings in cold regions. Parameters such as the collector area, circulation flow rate, and thermal storage volume are selected. A model is established via TRNSYS for simulation analysis. The simulation results indicate that the collector area is positively correlated with the overall operating temperature of the borehole heat exchanger. With a unit circulation flow rate of 0.03 m³/(h·m²) in the collector and pump operating/stopping temperature differentials set at 10 °C/2 °C respectively, the solar collector module demonstrates the collector efficiency of 45.2 %. A larger borehole spacing can achieve greater thermal storage efficiency, with an average decrease in the BHE center temperature of approximately 6.68 °C/m as the borehole spacing increases. With the SABTES-GSHP configuration, an instantaneous average system COP is over 2.80. Compared with the SABTES heating system, the thermal storage volume can be reduced by 72 % while still meeting 45 °C, reducing the initial construction cost by 56.7 %.

Keywords: Borehole thermal energy storage; Solar energy; Heat pump; Performance evaluation; Economic analysis (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:252:y:2025:i:c:s096014812501170x

DOI: 10.1016/j.renene.2025.123508

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