Graphics Programs Reference
In-Depth Information
Youmaythensetadesiredoperatingscheduleforthebuilding,approximate
HVAC system performances, and any outdoor air information desired.
If you choose the Rooms option for the Export Category parameter, the
settings options change slightly. The Include Thermal Properties setting
becomes available, which enables you to use the thermal properties of the
materials assigned to building components in the analysis. If no thermal
properties are defined in an element, the analysis is done with the
conceptual constructions.
Keeping It Simple
Remember that this is a
conceptual
energy analysis—not a full-blown LEED
or EPACT energy analysis. You will use this tool to ensure that energy
use and natural resources factor into the building layout, orientation, and
system design. In Revit MEP, greater modeling complexity will not always
result in greater analysis accuracy.
There are maximum limits that Revit can analyze to produce a successful
conceptual energy report. For a complex building, you may have to disable
the Divide Perimeter Zones option, reduce the Core Offset value to 0, and
create custom zones to simplify the model. You need to model only major
zones or spaces and combine smaller spaces into large zones. Spaces such as
restrooms, closets, and stairwells do not need to be defined. If the model is
kept complex, errors may be introduced in the simulation, and simulation
performance may decrease without an appreciable increase in the accuracy
of the results.
With a simplified mass model, Revit MEP allows for easy analysis and
comparison of design options. Experiment with different mass forms,
orientations, envelopes, schedules, occupancy, and zoning to determine
which building changes will have the greatest impact on energy
performance.
