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
138
Figure 8: Cross section of building and thermal zones.
Moreover, there are external obstructions (especially surrounding buildings) which shade
the façades of the school building.
To perform the energy calculation by means of a simplified quasi-steady state calculation
method (proposed by EN ISO 13790), it is necessary known the internal thermal
capacity of conditioned areas; in this case study it is 165 (kJ/K) per square meter.
The results relate to the calculation period of heating season (December 1 – March 31)
set by Italian legislation. The climatic data were taken by the UNI 10349 Italian standard
(UNI 10349, 1994). Table 3 and Fig. 9 report the results of calculation of energy need for
heating with reference to the building envelope
Table 3: Energy need for heating with reference to the building envelope.
Q
h,env
(MJ)
Zone
Dec
Jan
Feb
Mar
Total
Zone 1
70144
85536
70823
60437
286940
Zone 2
52966
64827
53124
44458
215375
Zone 3
66746
81458
67121
56852
272177
Zone 4
30851
37041
30305
25636
123834
Zone 5
4508
5355
4343
3686
17892
All zone
225214
274218
225716 191068
916217
Figure 9: Percentage distribution of energy need for heating
Zone 1
31%
Zone 2
23%
Zone 3
30%
Zone 4
14%
Zone 5
2%
Distribution of energy need
