Possible heat extraction power, 1800 operating hours, when dry

The heat-removal performances indicated here are for rough orientation only. They do not replace the individual assessment of each bore for the construction of a geothermal probe or the specific plant dimension. Due to rock changes, layer storage, ventilation and weathering, small-scale differences can occur. In addition, the actual specific extraction capacity of a geothermal probe is highly dependent on the design, installation of the probe and operation in addition to the geological factors. The layers were assigned possible heat extraction performances for the dry and water-saturated state. For the looser rocks, these correspond to the VDI 4640 sheet 2. For the fixed rocks, the possible withdrawal services for installations with 1800 operating hours/year according to SANNER (2005) without groundwater flow were approximated: SEL(1800) = -0.85WLF² + 13.62WLF + 22.13 For 2400 operating hours/year (after regression according to VDI 4640, tab 2): SEL(2400) = 0,8801*x – 2,8224 with x = SEL(1800) The maps show the average possible withdrawal performance per meter of drilling distance for holes up to 40, 60, 80 and 100 m depth. The values for the dry substrate are minimum values. For specific data on the height of the groundwater level, see map Groundwater-Flurabstand.