Environmental Engineering Reference
In-Depth Information
proximately 0.54 Mio. €/a to cover the defined heat demand of the new building
estate (Table 10.3).
Table 10.3
Investment, operation and heat production costs of heat supply systems
equipped with deep wells and a heat distribution according to the small district heating
n
etwork and house connection for the provision of domestic hot water and space heating
System
Existing well
New well
Small district heating network
DH-II
DH-II
Combination of systems
Light oil + heat pump
Light oil + heat pump
in GJ/a
a
Total heat demand
26,000
26,000
Heat at heating stat.
in GJ/a
h
32,200
32,200
Geothermal share
i
in %
43.6
43.6
Supply case
SFH-I
d
SFH-II
e
SFH-III
f
MFH
g
SFH-I
d
SFH-II
e
SFH-III
f
MFH
g
Heat demand
in GJ/a
b
32.7
55.7
118.7 496.1
32.7
55.7
118.7
496.1
Heating station and network
Investments
Production well
1.7
0.22
0.63
0.8
2.3
5.65
0.16
0.38
3.0
0.22
0.63
0.8
2.3
6.95
0.16
0.38
in Mio. €
Heat pump
in Mio. €
Peak-load plant
in Mio. €
Buildings etc.
in Mio. €
Heating network
in Mio. €
Total
in Mio. €
Operation costs
in Mio. €/a
Fuel costs
in Mio. €/a
House substation, house connect.
Investments
5,523
103
5,814
108
7,122
130
13,444
237
5,523
103
5,814
108
7,122
130
13,444
237
in €
Operation costs
in €/a
Heat production costs in €/GJ
42.7
0.15
a
without heat distribution network losses and losses due to building substation/warm water intermediate
storage;
b
without losses due to building substation/warm water intermediate storage;
c
at an interest rate of
4.5 % and an amortisation period covering the technical life time of the plant (geothermal plant compo-
nents 30 years, buildings and heat distribution network 50 years, building substation, heat pump and peak
load boiler 20 years);
d
low-energy detached family house (SFH-I);
e
detached family house (SFH-II)
equipped with state-of-the-art heat insulation;
f
old building detached family house (SFH-III) equipped
with average heat insulation;
g
multiple families house (MFH); for the definition of SFH-I, SFH-II, SFH-
III and MFH see Table 1.1 or Chapter 1.3;
h
including the losses of the heat distribution network and
the building substations;
i
delivered by the heat pump
.
52.1
0.19
46.2
0.17
42.1
0.15
39.1
0.14
55.7
0.20
49.8
0.18
45.7
0.16
in €/kWh
Heat production costs.
According to the calculation method applied so far, heat
production costs are calculated as annuities at an interest rate of 4.5 %; the amorti-
sation period covers the entire technical lifetime.
Heat supply by geothermal deep wells is characterised by relatively high costs
(Table 10.3); this is especially true if a new well needs to be drilled. As for hydro-
geothermal utilisation, due to the high share of fixed costs, the specific heat cost
decreases with the increase of the utilisation rate and the heat demand, respec-
tively. Only the energy costs required for the circulation of the heat carrier and the
heat pump operation as well as the operation of the fossil fuel-fired peak load
system depends on the provided useful energy.
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