Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1016/j.renene.2024.122171
Lizenz creative commons licence
Titel (primär) Field test and long-term heat extraction performance evaluation of the deep U-type borehole heat exchanger system
Autor Cai, W.; Wang, F.; Zhang, Y.; Jiang, J.; Wang, Q.; Shao, H. ORCID logo ; Kolditz, O. ORCID logo ; Nagel, T.; Chen, C. ORCID logo
Quelle Renewable Energy
Erscheinungsjahr 2025
Department ENVINF
Band/Volume 240
Seite von art. 122171
Sprache englisch
Topic T8 Georesources
T5 Future Landscapes
Keywords Deep U-type Borehole Heat Exchanger (DUBHE); Field test; Long-term performance; System optimization; Eavor-loop technology; OpenGeoSys
Abstract The concept of the deep U-type borehole heat exchanger (DUBHE) has been proposed and implemented in recent years to achieve higher heat extraction capacity and efficiency. Given the substantial initial investment required for implementation, it becomes imperative to quantitatively assess the long-term thermo-techno-economic performance of the DUBHE system. In this study, the pilot DUBHE project in Xi’an, China, is first introduced in detail, along with 60-day in-situ monitoring data. The monitoring data are used for the validation of a heterogeneous 3D numerical model that is established in OpenGeoSys (OGS) software. Based on the validated model, a series of extended scenarios of the DUBHE system are simulated to show that the maximum sustainable heat extraction rate of the pilot DUBHE system is around 480 kW. The heat extraction capacity of the DUBHE can be significantly improved by a larger depth rather than a longer horizontal length. The thermally affected distance extends more than 35 m away from the borehole. The techno-economic analysis shows that the lowest value of the Levelized Cost of Energy (LCOE) of the DUBHE system is 0.584 Yuan/kWh, which corresponds to the scenario with a vertical depth of 2800 m and a horizontal length of 600 m.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=30248
Cai, W., Wang, F., Zhang, Y., Jiang, J., Wang, Q., Shao, H., Kolditz, O., Nagel, T., Chen, C. (2025):
Field test and long-term heat extraction performance evaluation of the deep U-type borehole heat exchanger system
Renew. Energy 240 , art. 122171 10.1016/j.renene.2024.122171