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| Titel |
Geochemical properties of groundwater used to geothermal cooling and heating system |
| VerfasserIn |
Namju Kim, Youngyun Park, Jin-Yong Lee |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250077743
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| Zusammenfassung |
| Recently, geothermal cooling and heating system has been used in many countries to reduce
emission of greenhouse gases such as water vapour and carbon dioxide (CO2). Especially,
CO2 is emitted from combustion of fossil fuel used for cooling and heating of buildings.
Therefore, many countries make an effort to reduce amount of CO2 emitted from use of fossil
fuel. The geothermal cooling and heating system is good to reduce amount of CO2.
Especially, open loop geothermal system shows good thermal efficiency. However,
groundwater contaminations will be considered because groundwater is directly used in open
loop geothermal system. This study was performed to examine chemical and isotope
compositions of groundwater used in open loop geothermal system and to evaluate influence
of the system on groundwater using hydrochemical modeling program (preequc). Water
temperature of well used in the system (GH) and well around the system (GB) ranged
from 8.4 to 17.0 ° and from 15.1 to 18.0 °, respectively. The water temperature
in GH was lower than that in GB because of heating mode of the system. Also,
EC in GH and GB showed significant difference. The variation trend of EC was
different at each site where the system was installed. These results mean that main
factors controlling EC in GH was not the system. Generally, EC of groundwater
was influenced by water-rock interaction. However, DO and Eh hardly showed
significant difference. The operation period of the system observed in this study was
short than 5 years. Therefore, influence of the open loop geothermal system on
groundwater did not shown significantly. However, while Fe2+ and Mn2+ were not
observed in GB, these components were measured in GH. The concentrations of
Fe2+ and Mn2+ in GH ranged from 0.02 to 0.14 mg/L and from 0.03 to 0.18 mg/L,
respectively. These results mean that redox conditions of GH were changed by the
system little by little. In this study, influence of the open loop geothermal system on
groundwater did not shown significantly. However, change of redox condition was
slightly observed. To significantly observe influence of the open loop geothermal
system, monitoring for well installed the system is necessary during long period.
This work was supported by the Energy Efficiency and Resources of the Korea
Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by
the Korea government Ministry of Knowledge Economy (No.20123040110010). |
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