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Design of the control subsystem, including all components of this subsystem,
both hard (the set of sensors for monitoring, for example) and soft ones (the
numerical controller, for example), followed by incorporation of the entire
control subsystem in the functional model of mCCHP system.
Algorithmically, the functional design consists of the following steps:
1. Functional modeling of the system,
2. Elaboration of the operation and control strategies,
3. Analysis of the system dynamics,
4. Design of the control subsystem, and
5. Design of the system interfaces.
In the following, the functional design algorithm is presented in detail. Each
paragraph is dedicated to one of the steps above.
2 System Functional Modeling
Nicolae Badea
In establishing the set of structural models and evaluation of their performances (see
Chap.
“
”
), the following simplifi-
-
cations have been taken into account:
Only the main components of the system have been included in the structure,
especially those which generate the thermal or electric energy that the system
supplies the residence with.
Only the relation between the residence consumption and the system
s com-
ponents load has been considered, leaving out the system components
'
'
own
energetic consumptions.
consumption and the suppliers load were evaluated at the
level of each month of the year, and there were no established neither the
technical characteristics (installed power, for example) nor the operation time of
each component (either consumer or supplier).
For the structural design of the system, these simpli
Both the consumers
'
cations are acceptable; in
functional design, however, all the structural components of the system and all the
situations they are to work within need to be taken into account. That is why, once
selected, the structural models are considered as the starting point for the
rst step
in functional design, which is building the functional models. This step includes
two main actions:
Completing the structural models with all the complementary components, so
that it might support the concrete functioning mode of the system, this way each
of them becoming a functional scheme of the system;
Dimensioning all the components (be the main or complementary), of all func-
tional schemes, this way each of them becoming a functional model of the system.
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