Economic Feasibility of Measures for Energy Efficiency - Smart Rules for Smart Cities - page 88

Fig. 6.1 Energy
performance classes for
buildings according to EN
15217
Class A: High energy performance BACS and TBM systems;
Class B: Advanced BACS and TBM systems;
Class C: Standard BACS;
Class D: Non-energy efficient BACS.
The BACS efficiency classes refer only to the installed BACS and TBM sys-
tems and not to the building as a whole, as they are not correlated to the energy
classes defined by the European Standard EN 15217.
The latter energy classes are indeed referred to the energy consumption per unit
of volume or surface of a building. While the EN 15232 standard creates four
efficiency classes based on the presence of BACS and TBM systems.
The energy performance classes of a building are defined by the technical
standard EN 15217. These classes, on the basis of the different specific energy
consumption levels of the building, vary from G to A, as represented in Fig. 6.1 .
For evaluating the energy performance of a building, the technical norms issued
by CEN and summarized in the ''Umbrella Document'' CEN/TR 15615 can be
adopted.
An interesting analysis of the implementation status in the European Countries
of the EPBD recast can be found in (Andaloro et al. 2010 ).
The energy performance class of a residential building, in Italy, is calculated
neglecting the energy consumption for cooling or lighting and taking into account
only the primary energy consumption for heating and for sanitary hot water pro-
duction. For this reason, this certification process is quite unfeasible for Southern
Italy areas, where a large amount of energy is required for cooling during summer.
For calculating the amount of energy consumed, the Umbrella Document
indicates the technical standard EN ISO 13790 ( 2008 ). In Italy, the standards UNI
TS 11300 ( 2008a , b ), based on the above-mentioned standard, can be used for the
same purpose.