Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.3390/en15093444 |
Licence  |
|
| Title (Primary) | Numerical study on the long-term performance and load imbalance ratio for medium-shallow borehole heat exchanger system |
| Author | Wang, R.; Wang, F.; Xue, Y.; Jiang, J.; Zhang, Y.; Cai, W.; Chen, C.
|
| Source Titel | Energies |
| Year | 2022 |
| Department | ENVINF |
| Volume | 15 |
| Issue | 9 |
| Page From | art. 3444 |
| Language | englisch |
| Topic | T5 Future Landscapes |
| Keywords | medium-shallow borehole heat exchanger; load imbalance ratio; long-term performance; borehole heat exchanger array; load shifting |
| Abstract | To contribute to the goal of carbon neutralization, the closed-loop borehole heat exchanger system is widely applied to use geothermal energy for building cooling and heating. In this work, a new type of medium-shallow borehole heat exchanger (MSBHE) is proposed, which is coaxial type and has a depth range between 200 m to 500 m. To investigate the long-term performance of MSBHE in the area with unbalanced cooling and heating load of buildings and the sustainable load imbalance ratio under different design parameters, a comprehensive numerical model is established. The results show that the drilling depth significantly influences the sustainable load imbalance ratio of MSBHE. As the drilling depth is increased from 200 m to 500 m, the load imbalance ratio of the MSBHE increases from 20.76% to 60.29%. In contrast, the load imbalance ratio is always kept at the same level with different inlet velocities and operation modes. Furthermore, in a 9-MSBHE array system, the heat exchanger located in the middle of the array has the lowest load imbalance ratio of 48.97%, which is 15.98% lower than the borehole in the edge location. This is caused by the significant influence of the shifted-load phenomenon among MSBHEs in an array system. The findings of the work imply that this newly proposed MSBHE can sustain a notable load imbalance ratio, which is particularly applicable to the areas with a strong imbalance of annual building load. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=26143 |
| Wang, R., Wang, F., Xue, Y., Jiang, J., Zhang, Y., Cai, W., Chen, C. (2022): Numerical study on the long-term performance and load imbalance ratio for medium-shallow borehole heat exchanger system Energies 15 (9), art. 3444 10.3390/en15093444 |
|