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Exploration of thermal underground conditions Geothermal Response Test and design of

Exploration of thermal underground conditions Geothermal Response Test and design of Borehole Heat Exchangers Systems. UBeG GbR - Dr. E. Mands & Sauer Umwelt - Baugrund - Geothermie - Geotechnik Zum Boden 6, D-35580 Wetzlar, Tel.: 06441 212910 Email: e.Mands@UbeG.de.

lucretia-armando
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Exploration of thermal underground conditions Geothermal Response Test and design of

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  1. Exploration of thermal underground conditions Geothermal Response Test and design of Borehole Heat Exchangers Systems UBeG GbR - Dr. E. Mands & SauerUmwelt - Baugrund - Geothermie - GeotechnikZum Boden 6, D-35580 Wetzlar, Tel.: 06441 212910 Email:e.Mands@UbeG.de

  2. Geology of Hessen 2-2,5 W/mK 1,8 – 2,6 W/mK 1,6 – 2 W/mK Granites 2,5 – 3,5 W/mK

  3. Heat conductivity

  4. Thermal Conductivity

  5. Determination of • Thermal Conductivity • Borehole thermal Resistance • undisturbed underground temperature Geothermal-Response-Tests

  6. Commercial Geothermal Test in Germany • First generation of Mobile Geothermal Test in Germany 1999 First comercial test in Germany

  7. Second generation of Mobile Geothermal Test computer-controlled Hardware

  8. Hardware 3. Generation of Mobile Geothermal Test (compact) with small catapillar Max. Heat load 9kW, steppless regulation Computer-Controlled

  9. Automatic evaluation: - Datenfiles can be read directly into the soft ware - Controle of result by stepwise evaluation Software GeRT-CAL

  10. Stepwise evaluation A constant increase and irregular behaviour of the stepwise evaluation curve shows an influence of groundwater Testdauer: without groundwater influence Groundwater influence

  11. Temperature-profile 1h after end of test Directly after end of test Undisturbed (before Test) Information from the Temperature log: Determination of undisturbed underground temperature Determination of Geothermal Gradient Gives information about irrregular thermal conductivity Shows the influence of Groundwater

  12. Example GeRT Berlin 11/2006

  13. Example GeRT Camburg 10/2006

  14. Experience with Geothermal Tests

  15. Benefit of Gethermal-Response-Test

  16. Undersized Cost for a Geothermal Response Test +- 3400€

  17. Oversized I Cost for a Geothermal Response Test +- 3400€

  18. Design of BHE - System Input information from HVAC - Engineers

  19. Input Underground

  20. EED Calculation

  21. Type of BHE Example: 10 KW Heating 2100 Full load hours Heat conductivity of underground 2,5 W/m/k Double U-BHE Single U-BHE

  22. Comparison and recommendation Example: 10 KW Heating 2100 Full load hours Heat conductivity of underground 2,5 W/m/k Double U-BHE 165m Total BHE length Single U-BHE 195m Total BHE length A Double U- BHE has 10-15% more efficiency than a single U-BHE

  23. Depth of BHE Example: 10 KW Heating 2100 Full load hours Heat conductivity of underground 2,5 W/m/k 1 x 165m 2 x 82,5m

  24. Comparison and recommendation Example: 10 KW Heating 2100 Full load hours Heat conductivity of underground 2,5 W/m/k Single BHE (deep) 165m Total BHE length Two BHE (shallow) 184m Total BHE length For purly heating purposes a single deep BHE is more efficient than two shallow BHE

  25. Borehole diameter Example: 10 KW Heating 2100 Full load hours Heat conductivity of underground 2,5 W/m/k 152mm diameter 180mm diameter

  26. Comparison and recommendation Example: 10 KW Heating 2100 Full load hours Heat conductivity of underground 2,5 W/m/k Diameter 152mm 165m Total BHE length Diamter 180mm 178 m Total BHE length Kleiner Bohrlochdurchmesser wirkt sich günstig auf die Entzugsleistung aus

  27. Grouting-material Example: 10 KW Heating 2100 Full load hours Heat conductivity of underground 2,5 W/m/k Bentonit-Zement Verpressung Thermisch verbessertes Material

  28. Grouting Material

  29. Comparison and recommendation Example: 10 KW Heating 2100 Full load hours Heat conductivity of underground 2,5 W/m/k Cement – Bentonite Grouting 165m Total BHE length Thermal Grout e.g. STÜWATHERM 128 m Total BHE length Thermal Grout has 15% more efficiency

  30. Sumary • The design of BHE – Systems is in Germany under the regulation of VDI 4640 • Geological investigations are always necessary (interpretion of geological maps) • The design can be done by diagrams, tables, and calculations. • Project with more than 30KW heating load should be calculated • Furthermore Geothermal Response Tests should be performed • from 30KW and more • Thermal enhanced grouting material should be used for all BHE • drillings (STÜWA – THERM)

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