Environmental Engineering Reference
In-Depth Information
Apart from the investment costs for the heat source system and the heat pump,
there are also costs to be covered for the generation of domestic hot water and the
heat storage (Table 9.8 and 9.9). Furthermore, costs for mounting and installation
need to be added as well as the partial costs for the installation space in the base-
ment of the buildings to be supplies. Costs for the hydrological application and
reporting that the heat pump system is using the groundwater and the ground, to
the authority in charge also has to be included. With an increased system size, the
main share of the costs shifts from the heat pump to the heat source system. While
e.g. between 51 and 68 % of the total costs have to be allocated to the heat pump
for the analysed reference systems of system SFH-I, their share is between 26 and
29 % for the system MFH.
Table 9.9
Investment and operation costs plus heat generation costs of heat pump systems
for the generation of domestic hot water and space heating for the reference configurations
SFH-III and MFH (Table 9.7)
System
SFH-III
k
MFH
l
GB
a
GD
b
GP
c
GW
d
GP
c
GW
d
Heat source
Seasonal performance factor (SPF)
e
3.85
4.20
3.77
4.20
3.73
4.15
Investments
Heat source in €
Heat pump in €
Hot water
f
in €
Other
g
in €
Total €
O&M costs
h
in €/a
Electricity costs
i
in €/a
4,239
9,266
1,671
2,846
18,022
297
1,285
4,239
9,266
1,671
2,846
18,022
297
1,178
10,295
9,266
1,671
3,452
24,684
339
1,312
5,027
9,266
1,671
4,179
20,143
403
1,178
35,126
17,442
3,634
7,328
63,530
744
5,542
14,535
17,442
3,634
7,631
43,242
865
4,981
Heat generation costs
j
in €/GJ
in €/kWh
19.4
0.070
a
Heat pump with horizontal ground collector brine;
b
ground-coupled heat pump with direct evaporation;
c
heat pump with vertical ground probe;
d
heat pump with groundwater;
e
for the generation of domestic
hot water and space heating;
f
domestic hot water storage and connection to the heat pump;
g
e.g. costs for
the heater room, hydrological licensing according to the local water legislation plus mounting and instal-
lation;
h
operating and maintenance costs without electrical energy costs for e.g. driving the heat pump
compressor, control, brine circulation pump, etc.;
i
electrical energy costs e.g. for driving the heat pump
compressor;
j
annuity calculation at an interest rate of 4.5 % and an amortisation period over the technical
system life (heat source systems 20 years, heat pumps, domestic hot water generation and heat storage 15
years and building components 50 years);
k
single family house (SFH-III) as an old building with an aver-
age heat insulation;
l
multi family house (MFH); for a definition of SFH-III and MFH see Table 1.1 and
Chapter 1.3 respectively.
26.3
0.095
25.4
0.092
31.6
0.114
28.3
0.102
23.4
0.084
Operation costs.
The operation costs consist of the maintenance costs for the heat
pump system (e.g. exchanging the refrigerant or the heat carrier (brine); exchange
of sealings). Table 9.8 and 9.9 show a list of these costs for the reference systems
defined in Table 9.7. Depending on the size of the system, the operation costs are
therefore between approximately 166 and 865 €/a. Electrical energy costs to drive
the heat pump compressors and costs for e.g. the brine circulation pump, ground-
water extraction, ambient air ventilator or control are not included. These costs are
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