Z E M C H 2 0 1 2 I n t e r n a t i o n a l C o n f e r e n c e
140
Proposed rehabilitation actions
After evaluating the energy performance of building, we hypothesized some possible
action scenarios.
We have considered the following possible interventions:
1) thermal insulation of:
a) the roof;
b) vertical walls;
c) the floor of ground floor;
d) false ceiling (adjacent to unconditioned area).
2) Replacement of:
a) glazed surfaces;
b) boiler (with another more efficient).
These interventions were grouped in four possible action scenarios, as reported in Table
4.
Table 4. Proposed action scenarios.
Scenari
o
Thermal insulation
Replacement
Roof
Vertical
walls
Ground
floor
False
ceilings
Glazed
surfaces
Boiler
1
X
X
X
2
X
X
X
X
3
X
X
X
4
X
X
X
X
X
The proposed action scenarios influence considerably the energy consumption of
building; in fact, these actions reduce the energy consumption between 38.5% to 55.1%.
However, none of these actions is able to cut down the energy consumption so much so
that the Energy Performance index goes below the law limit value (see Fig. 11).
Figure 11: Graph of the EP index of various scenarios.
With regard to financial statement analysis, the payback times of action scenarios are
assessed in order to evaluate the profit of each scenario (see Fig. 12).
0
5
10
15
20
25
30
0
1
2
3
4
EP index (kWh/m
3
)
Scenario
Italian law limit
