SMILE C Software for Energetic Building- and Plant-Simulation

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                                                 Computer Architecture
                                                 and Software Technology

SMILE – Software for                             When the outside temperature exceeds
                                                 30 ºC, working in poorly ventilated offi-
Energetic Building-                              ces becomes an ordeal. To ensure that
and Plant-Simulation                             the future office workers will feel at
                                                 ease, architects are using simulation
                                                 programs even in the early planning
                                                 stages. Here, many interacting factors
                                                 have to be taken into account, inclu-
                                                 ding size and situation of the building,
                                                 insolation and the properties of the
                                                 construction materials used. Although
                                                 building climate simulations are a
                                                 standard feature of all planning proces-
                                                 ses, so far there have been few suitable
                                                 tools available for this purpose. What
                                                 are most needed are functioning inter-
                                                 faces to connect the architects’ CAD to
                                                 the relevant simulation programs.

                                                                                              Good ventilation is particularly important in office
                                                 Simulation of Complex Energy                 buildings

                                                 The simulation program SMILE allows
                                                 air circulation and heat distribution in a
                                                 building to be given detailed considera-
                                                 tion as early as the planning phase. This
                                                 data can be automatically imported
                                                 into the CAD data sets using the con-
                                                 struction sector’s internationally stand-
                                                 ardized IFC interface. SMILE has been
                                                 under development by Fraunhofer FIRST
                                                 and scientists at the Technical University
                                                 of Berlin since 1994 and has been used
                                                 mainly to simulate complex energy sys-
                                                 tems – e.g. systems comprising a build-
                                                 ing, an energy plant, a power station
                                                 and a district-heating network. But it
Fraunhofer Institute for Computer Architecture
                                                 can also be used as a tool for solving
and Software Technology FIRST
                                                 numerous other time-dependent simu-
System Analysis and Simulation – SAS             lation problems, such as occur in pro-
Dr. Christoph Nytsch-Geusen                      cess and mechanical engineering.
Kekuléstraße 7
12489 Berlin
phone: +49 (0)30 63 92 19 19
fax: +49 (0)30 63 92 18 05                       Technology
                                                 SMILE comprises an object- and equa-                                  tion-oriented language for model de-
scription, a description of the experi-
mental data based on the scripting lan-     Application Areas
guage Python, a model compiler, a run-
time system, several numerical methods      Energetic building and plant simulation,
as well as an extensive model library.      process engineering simulation
SMILE’s object-oriented model-descrip-
tion language is used to define model
classes which can be reused in differing    Partners
contexts. A SMILE model class contains
several equations that describe physical    dezentral GbR Berlin                       SMILE enables the building climate to be simula-
model behaviour, e.g. heat transport or     Technical University of Berlin             ted as early as the planning phase
flow behaviour. Complex models such
as those of buildings can be structured
into several hierarchical levels by using
the system’s object-oriented inheritance
and aggregation methods. If, for in-
stance, one wishes to simulate the ther-
mal behaviour of a complex building,
the relevant overall model can be built
from the submodels for the different
thermal zones. Using inheritance, gene-
ral models can be further developed
into specialized models.
The overall system models often contain
thousands or even tens of thousands of
equations. During the simulation pro-
cess, SMILE solves the equations of all
submodels in a shared system of equa-
tions, which means that even strongly
coupled models can be computed along
with their discrete state changes with-
out iteration.
Another focus of the SMILE project’s
work is coupling CAD tools to SMILE’s
simulation kernel. This involves, among
other things, integrating CAD building
construction software into the energe-
tic building simulation system using
standardized data exchange formats. In
the future, this could make it possible –
with minimal effort – to integrate geo-
metrical, topological and physical
model parameters from CAD applica-
tions directly into the simulation sys-
tem, thus considerably reducing simu-
lation times.

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