Environmental Engineering Reference
In-Depth Information
Table 6.16
Annualized CCF (values in €)
Year
CCF
Year
CCF
0
-56,350
16
-17,843
1
-54,278
17
-15,015
2
-52,165
18
-12,133
3
-50,011
19
-9,193
4
-47,814
20
-6,196
5
-45,574
21
-3141
6
-43,291
22
-25
7
-40,963
23
3,151
8
-38,589
24
6,390
9
-36,168
25
9,693
10
-33,700
26
13,060
11
-31,184
27
16,493
12
-28,618
28
19,994
13
-26,002
29
23,563
14
-23,335
30
27,202
15
-20,615
Moreover the electricity and natural gas costs are assumed to increase of 4.0 %
each year.
Finally, in Table
6.13
the economic savings obtainable for the test house,
varying the energy class from A to G are reported.
For the calculations, the electrical energy cost has been assumed equal to
0.19 €/kWh and the natural gas cost has been assumed equal to 0.091 €/kWh
(EUROSTAT
2012
). The economic savings can be very different from Country to
Country, since they depend on climatic conditions but also on the local energy
price. In particular, in Italy the latter is quite high as compared to other European
Countries.
In Table
6.14
the annualized cash flows are reported as the energy class of the
test house varies from A to G.
In the examined case the Payback Period (PBP) ranges from 11 years if the
starting energy performance class is G to more than 30 years if the starting class is
A. Nevertheless it is very important to underline that these values must not be
considered as universally valid.
Indeed, the PBP as well as the cash flows depend strongly on the number, on the
kind and on the market cost of the components of the BAC system installed, on the
actual energy savings that can be attained per year depending on the kind of
thermal/cooling system installed and on the daily management of the building.
