Civil Engineering Reference
In-Depth Information
Subindices
d
delivered
e
exported
b
building
Equation (6.1)
represents the energy balance in the building, considering
thatthedifferencebetweentheenergyusedforcharginganddischargingthe
storage system is due to the variation of internal energy in the storage and
the losses in the storage system itself (
Eq. (6.2)
)
The difference between exported energy from the building to the grid,
e
(
t
),
and delivered energy,
d
(
t
), is also known as the net exported energy
represented by ne(
t
):
(6.3)
The quantities shown in
Figure 6.4
refer to instantaneous values. The
integrated value of these quantities over time is used to evaluate the energy
balance in a known period of time, between
τ
1
and
τ
2
. In case that the
difference between internal energy of the storage system at the beginning
and the end of the time period, for example, one complete year, can be
considered negligible, the balance equation is
(6.4)
6.2.2 Categories of Indicators
ThechoiceofLMGIindicatordependsontheobjective(assessment,control,
description, certification, etc.) and on the information at hand. Salom
et al.
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