Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.energy.2021.122937
Title (Primary) Long-term performance evaluation for deep borehole heat exchanger array under different soil thermal properties and system layouts
Author Cai, W.; Wang, F.; Chen, C.-F. ORCID logo ; Chen, S.; Liu, J.; Ren, Z.; Shao, H. ORCID logo
Source Titel Energy
Year 2022
Department ENVINF
Volume 241
Page From art. 122937
Language englisch
Topic T8 Georesources
Keywords Deep borehole heat exchanger array; Heating system; Soil thermal property; System layout; Long-term sustainability
Abstract To meet the prospect of carbon neutrality, Deep borehole heat exchanger (DBHE) shows good potentiality in extracting deep geothermal energy for building heating, especially in densely populated urban areas of northern China. To investigate the influence on different soil thermal properties and system layouts of the DBHE array, a comprehensive numerical model has been established by OpenGeoSys software coupled TESPy toolkit and a series of scenarios are simulated. Results show that thermal conductivity lay a more important influence on heat extraction performance for DBHE array, rather than volumetric heat capacity. The thermal plume of DBHE array will grow larger along with higher thermal diffusivity. For typical geological parameters in Xi'an, the inter-borehole spacing should not be set below 15 m or it will bring a risk of freeze in circulation. The heat extraction performance and long-term sustainability of single-line layout are obviously better than other layout patterns, also with a smaller ground area needed to deploy the boreholes. This study implies that soil thermal conductivity is the core factor in determining the heat extraction performance of DBHE array and also gives suggestions for the system design of DBHE array in the aspect of borehole spacing and system arrangement.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=25527
Cai, W., Wang, F., Chen, C.-F., Chen, S., Liu, J., Ren, Z., Shao, H. (2022):
Long-term performance evaluation for deep borehole heat exchanger array under different soil thermal properties and system layouts
Energy 241 , art. 122937 10.1016/j.energy.2021.122937