Environmental Engineering Reference
In-Depth Information
Energy performance (EP)
EP
Overall energy
performance of the
building, including its
technical building
systems
EP
expressions
EP
aggregation
Boundaries,
classification
Collect all energy elements
Building energy needs
and system energy losses
Component input data
Boundary conditions
FIGURE 7.1
Overall building energy performance. (From Van Dijk, D. and Khalil, E. E.,
ISO Focus
.,
25-27, 2011.)
Sets of common terms, definitions and symbols are essential for all
segments from top to bottom. These include energy needs, technical build-
ing systems, auxiliary energy use, recoverable system losses, primary energy
and renewable energy (Figure 7.2) [11].
The top segment of the pyramid is the main output: the energy perfor-
mance and the energy performance certificate of the building.
The second segment provides the inputs for the top segment: one or more
numerical indicators expressing the energy performance (such as overall
energy use per square meter conditioned floor area, EP), a classification
and ways to express the minimum energy performance requirements (EP
max
)
(Figure 7.3) [9].
The third segment describes the principles and procedures on the weight-
ing of different energy carriers (such as electricity, gas, oil or wood) when
they are aggregated to overall amount of delivered (and exported) energy.
For instance, this may be expressed as total primary energy (
E
P
) or carbon
dioxide emission
(
)
CO
E
.
The fourth segment specifies the categorisation of building types (for
e.g. office spaces, residential or retail) and specification of the boundaries of
the building (Figure 7.4) [11].
