 |
| Titel |
Impact factors on the long-term sustainability of Borehole Heat Exchanger coupled Ground Source Heat Pump System |
| VerfasserIn |
Haibing Shao, Philipp Hein, Uwe-Jens Görke, Anke Bucher, Olaf Kolditz |
| Konferenz |
EGU General Assembly 2016
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250126053
|
| Publikation (Nr.) |
 EGU/EGU2016-5730.pdf |
|
|
|
|
|
| Zusammenfassung |
| In recent years, Ground Source Heat Pump System (GSHPS) has been recognized as an
efficient technology to utilize shallow geothermal energy. Along with its wide application,
some GSHPS are experiencing a gradual decrease in Borehole Heat Exchanger
(BHE) outflow temperatures and thus have to be turned off after couple of years’
operation. A comprehensive numerical investigation was then performed to model
the flow and heat transport processes in and around the BHE, together with the
dynamic change of heat pump efficiency. The model parameters were based on the soil
temperature and surface weather condition in the Leipzig area. Different scenarios were
modelled for a service life of 30 years, to reveal the evolution of BHE outflow and
surrounding soil temperatures. It is found that lateral groundwater flow and using
BHE for cooling will be beneficial to the energy recovery, along with the efficiency
improvement of the heat pump. In comparison to other factors, the soil heat capacity
and thermal conductivity are considered to have minor impact on the long-term
sustainability of the system. Furthermore, the application of thermally enhanced grout
material will improve the sustainability and efficiency. In contrast, it is very likely that
undersized systems and improper grouting are the causes of strong system degradation. |
|
|
|
|
|
|