Civil Engineering Reference
In-Depth Information
building energy labelling, in acknowledgement of the European Standard EN ISO
13790 for the envelope and EN 15316 for the heating system.
Furthermore, the Decree of the Economical Development Ministry 29th June
2009 ''National Guidelines for buildings energy certification'' reports the com-
mitments for energy labelling. National guidelines establish the energy label to be
determined according to the global performance index (EPgl) which, for the time,
takes into account the energy needs for heating and domestic hot water production.
In order to draw up an energy performance certificate, the asset rating provided
by UNI/TS 11300 has to be applied; therefore, actual data for the building and
standard-use data set have to be collected. In case of existing buildings, finding out
all the requested data could be complicated; therefore, Italian procedures allow
simplified kind of calculation based on parameters from tables or standard data
sets.
Some examples of asset rating application were reported in Ballarini and
Corrado
2009
, which analysed the differences between calculated and measured
energy rating, to underline the effect of user behaviour and weather conditions;
furthermore, correlations among input and output data were found out to charac-
terize the energy behaviour of some typical construction of Italian residential
building stock.
Some other comparison among different methodologies for asset rating
applying Italian procedures were presented in Magrini et al.
2010
: the results are
expounded in terms of global performance index of the analysed building.
Furthermore, different values of energy performance could be obtained
applying various simulation tools (Tronchin and Fabbri
2010
) and according to the
accuracy of the data input: some parameters are more significant than others, and
they influence the results of the simulations.
2 Aim of the Work
In the past recent years, an extensive literature has been devoted to the subject of
energy performance of buildings with reference to energy labelling (Wang et al.
2012
). Some papers investigated differences between standard and measured
energy rating calculation methods, to underline the effect of user behaviour and
weather conditions (Corrado and Mechri
2009
) or problems related to the calcu-
lation of the utilization factor in national application of EN ISO 13790 (Fokaides
et al.
2011
). Some approaches dealt with energy optimization in buildings, by the
application of multi-objective optimization techniques, or by incorporating
financial aspects (Jokisalo and Kurnitski
2007
; Diakaki et al.
2008
).
The European Standard EN ISO 13790 proposes calculation methods for the
design and the evaluation of thermal and energy performances of buildings, with
the possibility to apply detailed or simple dynamic hourly methods, but also quasi-
steady-state methods, on monthly or seasonal base. In particular, it also provides
procedures
for
the
application
at
national
or
regional
level
for
the
energy
