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Building Performance Simulatio
Workflows and Tools
Drury Crawley, Ph.D., BEMPDirector of Building Performance
Bentley Systems
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Traditional Simulation
Workflow Challenges
Early design through constructiondocuments with
increasingdetail, multiple solutions
Existing buildings with no details(maybe no drawings?)
Manual input, data re-creation,
translation
errors andomissions Utilizing virtual data (2-D CAD,
BIM) geometry robust, otherdata limited
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Manual Model Creation
Paper or BIM DrawingAnaly
Manual Data Re-creation and Entry
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2D Workflow2-D Drawing Analy
Energy ModelDefine Spaces
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via gbXML, IFCs, direct
BIM to Sim (In)directlyBIM Model
Analytical Model
Energy Model
Analy
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BIM to Sim(ulation)
Translate BIM to Simulation
BuildingSMART IFCs (Industry Foundation Classe Any BIM software
that supports interoperability, available s Limited to what BIM
tools decide to exporttypically only g
gbXML
Autodesk Green Building Studio Web-based conversion of major BIM
formats to energy sim Limited coverage Can require users to create
their BIM drawings in structure
(may not follow designer regular workflow)
Direct from BIM to Simulation Major tools already have or are
adding direct export to one or more sim
Interoperability is key to getting energy simulatiomainstream.
Other driverszero-energy buildinbuilding rating systems
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Direct from BIM to Sim Available N
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What Should I Look for in Performanc
Simulation Tools?
Accuracy Sensitivity
Versatility
Speed and cost
Reproducibility Ease of Use
Validation
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How Do I Decide Which Building Perform
Tool(s) to Use?
What am I trying to assess? Simple change in performance may
warrant a simplesuch as bin method or degree-day
Interactions of building systems warrants dynamic simtools
Make sure the tool can predict the physics yointerested in, such
as radiant systems, dayligilluminance, ground heat transfer, or a
specifsystem configuration
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Where Do I Look?
ASHRAE Handbook 2013FundamentalsChapter 19 Energy Estimatingand
Modeling Methods
US DOE Building EnergySoftware Tools Directory
Building Performance Simulationfor Design and Operation
Hensen and Lamberts 2011
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Summary
Software tools are available today to suppanalysis of many
aspects of building perfo
BIM to Sim still challenging
Critical to select the right software for the performance issues
that youre evaluating
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More Resources
ASHRAE Fundamentals 2009, Chapter 14 Hensen, J an L.M. and
Roberto Lamberts. 2011. Building Performance Simula
Design and Operation. London: Spon Press. US DOE Building Energy
Software Tools Directory
http://buildings.energy.gov/tools_directory/ Contrasting the
Capabilities of 20 Building Simulation Programs (2005):
http://buildings.energy.gov/tools_directory/pdfs/contrasting_the_capabilities_ergy_performance_simulation_programs_v1.0.pdf
GSA BIM Guide for Energy Performance
(2012)http://www.gsa.gov/graphics/pbs/GSA_BIM_Guide_Series.pdf
National BIM Standard (2012) http://www.nationalbimstandard.org/
Daniel H. Nall, Drury B. Crawley. 2011. Energy Simulation in the
Building De
ASHRAE Journal, republished from November 1983. pp. 36-43, Vol.
53, No.
