Measurements and Design Calculations for a Deep Coaxial Borehole Heat Exchanger in Aachen, Germany
This study aims at evaluating the feasibility of an installation for space heating and cooling the building of the university in the center of the city Aachen, Germany, with a 2500 m deep coaxial borehole heat exchanger (BHE). Direct heating the building in winter requires temperatures of 40°C. In s...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | International Journal of Geophysics |
| Online Access: | http://dx.doi.org/10.1155/2013/916541 |
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| author | Lydia Dijkshoorn Simon Speer Renate Pechnig |
| author_facet | Lydia Dijkshoorn Simon Speer Renate Pechnig |
| author_sort | Lydia Dijkshoorn |
| collection | DOAJ |
| description | This study aims at evaluating the feasibility of an installation for space heating and cooling the building of the university in the center of the city Aachen, Germany, with a 2500 m deep coaxial borehole heat exchanger (BHE). Direct heating the building in winter requires temperatures of 40°C. In summer, cooling the university building uses a climatic control adsorption unit, which requires a temperature of minimum 55°C. The drilled rocks of the 2500 m deep borehole have extremely low permeabilities and porosities less than 1%. Their thermal conductivity varies between 2.2 W/(m·K) and 8.9 W/(m·K). The high values are related to the quartzite sandstones. The maximum temperature in the borehole is 85°C at 2500 m depth, which corresponds to a mean specific heat flow of 85 mW/m2–90 mW/m2. Results indicate that for a short period, the borehole may deliver the required temperature. But after a 20-year period of operation, temperatures are too low to drive the adsorption unit for cooling. In winter, however, the borehole heat exchanger may still supply the building with sufficient heat, with temperatures varying between 25 and 55°C and a circulation flow rate of 10 m3/h at maximum. |
| format | Article |
| id | doaj-art-6a749c5e8553462b8968d32de5447a48 |
| institution | Kabale University |
| issn | 1687-885X 1687-8868 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Geophysics |
| spelling | doaj-art-6a749c5e8553462b8968d32de5447a482025-02-03T07:25:58ZengWileyInternational Journal of Geophysics1687-885X1687-88682013-01-01201310.1155/2013/916541916541Measurements and Design Calculations for a Deep Coaxial Borehole Heat Exchanger in Aachen, GermanyLydia Dijkshoorn0Simon Speer1Renate Pechnig2Institute for Applied Geophysics and Geothermal Energy, E.On Energy Research Center, RWTH Aachen University, Mathieustraße 10, 52074 Aachen, GermanyInstitute for Mining Engineering I, RWTH-Aachen University, Wüllnerstraße 2, 52056 Aachen, GermanyGeophysica Beratungsgesellschaft mbH, Lütticherstraße 32, 52064 Aachen, GermanyThis study aims at evaluating the feasibility of an installation for space heating and cooling the building of the university in the center of the city Aachen, Germany, with a 2500 m deep coaxial borehole heat exchanger (BHE). Direct heating the building in winter requires temperatures of 40°C. In summer, cooling the university building uses a climatic control adsorption unit, which requires a temperature of minimum 55°C. The drilled rocks of the 2500 m deep borehole have extremely low permeabilities and porosities less than 1%. Their thermal conductivity varies between 2.2 W/(m·K) and 8.9 W/(m·K). The high values are related to the quartzite sandstones. The maximum temperature in the borehole is 85°C at 2500 m depth, which corresponds to a mean specific heat flow of 85 mW/m2–90 mW/m2. Results indicate that for a short period, the borehole may deliver the required temperature. But after a 20-year period of operation, temperatures are too low to drive the adsorption unit for cooling. In winter, however, the borehole heat exchanger may still supply the building with sufficient heat, with temperatures varying between 25 and 55°C and a circulation flow rate of 10 m3/h at maximum.http://dx.doi.org/10.1155/2013/916541 |
| spellingShingle | Lydia Dijkshoorn Simon Speer Renate Pechnig Measurements and Design Calculations for a Deep Coaxial Borehole Heat Exchanger in Aachen, Germany International Journal of Geophysics |
| title | Measurements and Design Calculations for a Deep Coaxial Borehole Heat Exchanger in Aachen, Germany |
| title_full | Measurements and Design Calculations for a Deep Coaxial Borehole Heat Exchanger in Aachen, Germany |
| title_fullStr | Measurements and Design Calculations for a Deep Coaxial Borehole Heat Exchanger in Aachen, Germany |
| title_full_unstemmed | Measurements and Design Calculations for a Deep Coaxial Borehole Heat Exchanger in Aachen, Germany |
| title_short | Measurements and Design Calculations for a Deep Coaxial Borehole Heat Exchanger in Aachen, Germany |
| title_sort | measurements and design calculations for a deep coaxial borehole heat exchanger in aachen germany |
| url | http://dx.doi.org/10.1155/2013/916541 |
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