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consumption diagram. In conclusion, it follows that for the supplier to be able to
cover the consumption throughout the month, just as their installed capacity can
support the daily load.
6.2 System Load Estimation
The system load is de
fill the storage. It is estimated in
two situations, namely during the system operation and during the system design.
During system operation, it is estimated the momentary load command, so that
the suppliers to cover the demand occurs at the moment. If
ned as the load necessary to
E is less than the daily
consumption, then the load is even the P
1
Q
1
line in Fig.
26
b. In this case, the
estimation is based on the consumption diagram resulting from the system moni-
toring.
D
E is higher than the daily consumption, then estimation of the
momentary load command is performed on other bases, which will be presented in
During system design, it is estimated the monthly load, namely that corre-
sponding to each month of the year. No matter how big is
If
D
E the estimation is
carried out on the base of the monthly consumption, which was obtained by
applying the estimation methods presented in Sect.
5
.
D
6.3 Load Sharing
During system design, the ultimate goals of the load estimation are: (a) sizing the
suppliers, so that they can support the estimated load, and (b) assess the perfor-
mance indicators for each structural model in order to eliminate models less effi-
-
cient. To achieve these goals the system load should be split between suppliers, to
thus
find the daily load for each supplier. As a graphical example, let us consider
the following cases: (a) structural model with mechanical compression chillers and
(b) thermally compression chillers shown in Figs.
27
and
28
. This problem is called
load sharing and has the following features.
The solution of the problem depends on the system structure. Therefore, for
each given structural model the problem resolves separately.
Solving the problem does not lead to a unique solution (except for very simple
cases). In order to select a solution, it should adopt a certain load sharing strategy,
previously de
ned. Therefore, the solution depends on the strategy adopted.
Level of performance indicators depends not only on the given structural model
and the adopted load sharing strategy, but also on the consumption diagram,
which varies from month to month. Thus, the performance indicators change
from month to month of the year. Therefore, an optimal solution of the problem
is valid only for the month for which was determined.
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