Environmental Engineering Reference
In-Depth Information
The costs of an ORC plant of an electric capacity of 1,000 kW amount to ap-
proximately 1.9 Mio. €. Additionally, cost intensive heat exchangers are required.
The price of the building, where all remaining system components are located,
including the land property adds to that. For the calculations indicated below
500,000 € are assumed.
Moreover, planning and preparation costs (such as geological surveys, permis-
sion fees) need to be considered. For the case study analysed here, an average
value of 4.8 % of the overall investments is assumed.
T
able 10.4
Investment and operation costs as well as electricity generation costs
Average conditions
Favourable conditions
1,000
a
1,000
a
Installed electric capacity
in kW
Investments
doublette in Mio. €
pump in Mio. €
geothermal fluid circuit in Mio. €
slop and filter systems in Mio. €
power plant in Mio. €
heat exchanger for DH in Mio. €
building in Mio. €
planning in Mio. €
Total in Mio. €
Operation, maintenance etc. in Mio. €/a
Credit for heat
9.4
c
0.24
1.20
0.22
1.90
0 (A) / 0.23 (B)
0.50
0.66
14.11 (A) / 14.35 (B)
0.34
0 (A) / 0.22 (B)
0.17 (A) / 0.14 (B)
DH district heat, (A) Plant A (see text), (B) Plant B (see text);
a
temperature of the geothermal fluid
free power plant 140 °C, production rate 100 m
3
/h, two vertical wells, distance between the two
wells 2,000 m;
b
well depth 4,600 m;
c
well depth 2,700 m
15.40
b
0.24
1.20
0.22
1.90
0 (A) / 0.23 (B)
0.50
0.95
20.39 (A) / 20.64 (B)
0.34
0 (A) / 0.22 (B)
0.22 (A) / 0.18 (B)
in Mio. €/a
Electricity provision costs
in €/kWh
Operation costs.
Annual operation costs basically consist of costs for personnel
and maintenance. To minimise the costs, a plant operation without supervision is
assumed (Table 10.4).
Maintenance costs are estimated related to individual plant components at
0.5 % of the investment costs for wells, and 4 % for pipes, heat exchangers and
miscellaneous, respectively. For the ORC plant or any other type of conversion
plant and the building, maintenance cost of 1 % of the investment costs are as-
sumed.
Energy generation costs.
Under the discussed frame conditions the electricity
generation costs have been calculated for an ORC plant for a flow rate of the
thermal fluid extracted from the underground of 100 m
3
/h and a well head
tem-
perature of 150 °C (Table 10.4). According to Fig. 10.22 they are thus within the
range between 0.14 and 0.22 €/kWh.
For exclusive power generation (Plant A) the calculated electricity production
costs vary between 0.17 and 0.22 €/kWh. Well costs, including drilling and stimu-
lation as well as pumps account for approximately 70 %, whereas 30 % are attrib-
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