Environmental Engineering Reference
In-Depth Information
Following these assumptions, depending on the share of geothermal energy
within the overall heat provision, the plant size and the capacity of the house sub-
stations the heat production costs amount to between 36 and 50 €/GJ (Table 10.2).
Table 10.2
Investment and operation costs as well as heat production costs of the geo-
thermal plant components, heat distribution within the district heating network within a
geothermal/fossil system providing domestic warm water and space heating
System
geoth. capacity
DH-II
3.3
22,100
26,000
85
DH-III
1.45
26,300
52,000
50.6
in MW
geoth. heat supply
in GJ/a
a
total heat supply
in GJ/a
geothermal share
in %
SFH-I
b
SFH-II
c
SFH-III
d
MFH
e
SFH-I
b
SFH-II
c
SFH-III
d
MFH
e
Supply case
Heat demand
in GJ/a
32.7
55.7
118.7
496.1
32.7
55.7
118.7
496.1
Geothermal heating station
prod. well
2.5
2.5
0.034
1.7
1.7
0.014
0.22
0.32
0.72
0.33
1.66
4.62
11.28
in Mio. €
injection well
in Mio. €
heat exchanger
in Mio. €
heat pump
in Mio. €
CHP station
in Mio. €
0.45
0.20
1.74
2.31
9.73
peak-load heat
in Mio. €
buildings
in Mio. €
miscellaneous
in Mio. €
district heat. system
in Mio. €
Total
in Mio. €
Operation costs
in Mio. €/a
0.13
0.06
0.16
0.75
Fuel costs
in Mio. €/a
Building connection
investment costs
in €
5,520
102
5,810
107
7,120
129
13,440
237
5,520
102
5,810
107
7,120
129
13,440
237
operation costs
in €/a
Heat production costs
35.8
0.13
a
geothermal share of the total heat supply without heat losses due to the district heating network, the house
substations as well as the warm water intermediate storage systems;
b
low-energy detached family house
(SFH-I);
c
detached family house equipped with state-of-the-art heat insulation (SFH-II);
d
detached old
building family house equipped with average heat insulation (SFH-III);
e
multiple-families house (MFH); for
the definition of SFH-I, SFH-II, SFH-III, and MFH see Table 1.1 or Chapter 1.3.
in €/GJ
49.9
0.18
44.1
0.16
40.0
0.14
35.8
0.13
48.7
0.18
42.8
0.15
38.8
0.14
in €/kWh
These heat provision costs relate to the total heat production costs of a com-
bined heat supply based on geothermal and fossil resources. This is true because,
according to the plant design, the base load is covered by geothermal energy
whereas the peak load is provided based on fossil fuel energy (DH-II und DH-III).
For the system DH-III additionally part of the base and peak load heat is provided
by the CHP station and the heat pumps (DH-III). The heat production costs of a
geothermal heating system without the described use of fossil fuel energy would
be considerably higher, as the geothermal plant components would also addition-
ally have to cover peak demand, leading to a reduced number of full load hours of
the geothermal part and thus also of the heat provided by geothermal resources.
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