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Geothermal Energy

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Table 1 Results of the estimation of the geothermal potential for the vGSHP system with a COP = 4 for Scenarios 2 to 5 and the heat supply rate S before and after refurbishment with a fixed BHE spacing

From: Meeting the demand: geothermal heat supply rates for an urban quarter in Germany

Scenario

Fixed BHE spacing d = 10 m

Inverse analysis

E (GWh)

S (%)

BHE spacing (m)

Number of BHE

Before

After

Before

After

Before

After

2: RDD

2.3

22

47

4.5

6.5

4675

2242

3: RDD + GW

3.4

34

71

5.5

8

3121

1473

4: no RDD

13.3

131

277

11

16

783

377

5: no RDD + GW

15.4

152

322

12

17.5

657

302

  1. Results of the inverse analysis: the minimum BHE spacing and number of BHEs for which a heat supply rate of at least 100% before or after refurbishment can be achieved. The four scenarios consider variable heat extraction rates q depending on groundwater flow (GW) and two different BHE lengths (17 m and 100 m) corresponding to the restriction of the drilling depth (RDD, no RDD)
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