Abstract
Building energy performance (BEP) simulation
is increasingly used worldwide
to quantitatively justify
bui
lding design decisions
and building operations strategies
.
I
t is becoming increasingly obvious that
the
results of such simulation are often questionable, cannot be trusted, and may lead to wrong
decisions.
Poor simulation model definition
and the use of
inappropriately acquired and transformed
data are two of the
most common causes of this.
The use of LBNL
methodology for semi
-
automated
BEP simulation
data input
automates data acquisition and transformation,
which
removes human
decision making from the
simulation input
data
definition
process. The first of the three major
software components (th
e Geometry Simplification Tool or GST)
is already in use.
Work on the
second component (
an interoperable HVAC graphic user interface for EnergyPlus
)
is under
de
velopment
.
The third component
(
an
internal loads generation tool)
will be developed in the near
future.
The original HVAC GUI for EnergyPlus component has evolved into a BEP simulation
platform c
ode
-
nam
ed
Mojito. A
new internal data model
which defines
all object/attribute/
relationship sets used in BEP simulation
, called SimModel, is
t
he central feature of
Mojito
.
Modeling
imprecision
is
very
characteristic of geometry representation in building models
submitted by
the Architecture
-
E
n
gineering
-
Constru
ction
-
Owners
-
O
perator (AECOO) industry. This
,
and the lagging and very slow development of CAD utilities that can generate higher
-
level space
boundaries needed in BEP simulation
,
has forced
the development of a
new
tool
(SBT)
that calculates
higher
-
level
space boundaries from IFC
-
compliant definition of basic building geometry from any
model
-
based CAD tool
.
It has also forced the
addition of new data transformation rules in GST.
This paper
descri
bes the principles and high
-
level views of SimModel, SBT an
d GST internal
architectures, and discusses some of the model and tool functionalities. It also provides a brief
summary of quality assessment characteristic of building models generated in the AECOO industry.
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