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© 2012 Autodesk MP7120 Creating BIM Models for Energy Analysis Aryn Bergman, PE, LEED AP Energy Analyst – TL Circle; BIM Manager - Facebook
© 2012 Autodesk Class Summary This class will present example projects to demonstrate appropriate techniques for creating Revit models and families for energy analysis purposes: 1. Autodesk San Rafael HQ 111 McInnis Building – Revit model for the creating of DOE2 energy models 2. Rebuild Sudans South Sudanese Primary School project – BIM geometry for daylighting and CFD analysis in Autodesk® Ecotect® Analysis and Simulation CFD 360 2013 3. Revit Families of Servers for Facebooks Data Center Designs – Revit families tha are being created to represent Facebooks servers and connect their models to a databases and spreadsheets through DB Link and the Revit API
© 2012 Autodesk Learning Objectives At the end of this class, you will be able to: Setup project template files to expedite analysis processes Create BIM geometry for us in energy, daylighting and CFD models Create Revit families that can connect to databases and spreadsheets through Revits DB Link and API. Link a BIM model to databases and spreadsheets
© 2012 Autodesk Autodesk University 2012 Power Track Energy Optimization for Retrofits MP3397-P - Taking Advantage of BIM for CFD Modeling MP3565-P - Using a Retro-BIM Workflow: Case Studies in Energy-Driven Retrofit Projects MP3765-P - Using BIM to Streamline Your Energy Modeling Workflows MP3784-P - Calibrating an Existing Building Energy Model
© 2012 Autodesk Creating a Project Template File
© 2012 Autodesk Revit Families – Walls, Floors, and Roofs Create exterior an interior walls with a standard thickness (i.e. 6) to facilitate alignment Specify the Function Each envelope property should have a distinct material and color for identification purposes Do the same for exterior floors, interior floors and roofs Each material should have a distinct and identifiable name Add a descriptive text to the Type Comments field for filter views
© 2012 Autodesk Metal Roofs, Ceilings, and Shading Devices Use a ceiling family with no thickness for metal roofs if you use the model to create a CFD model Create a family type for the walls for the vertical shading device and a family type for roofs for horizontal and angled shading devices (thickness doesnt matter)
© 2012 Autodesk Windows, Skylights, Doors, and Openings For windows and skylights, create families that are only openings with an extrusion representing the glazing area. Other types may cause errors in energy models and will slow down CFD model run times Use reference planes to control the dimensions of the opening Doors are unnecessary in energy models (not required if < 10% of overall surface area of the building per ASHRAE 90.1) Use Windows for other openings.
© 2012 Autodesk Views Create floor plans and 3D views under the Discipline Architectural so architectural elements are clearly visible and easier to select For larger projects, create a sub-Discipline Energy Modeling to group views with the energy analysis geometry in the project tree Create a view on the ground floor with Orientation set to True North to create the geometry in plan view, but have the ability to rotate the project to true North at any time without affecting other views
© 2012 Autodesk Views Create additional views for the space and HVAC zones Edit the color schemes appropriately
© 2012 Autodesk Schedule Properties
© 2012 Autodesk Create 3D Views Create a 3D view for each building component type The views will hide the other building components so you can export them out as a group Allows you to manipulate the properties of each component for the entire building at the same time
© 2012 Autodesk Filters
© 2012 Autodesk Creating BIM Geometry for Energy Analysis
© 2012 Autodesk BIM for Energy Models General Rules Dont use rectangular straight wall openings. Theyre not space bounding. Dont allow any gaps between architectural elements. Space object may leak and prevent the analysis from running. Dont use in-place families. Use native tools for envelope components. In-place families dont translate to the energy analysis program. Dont include shaft or stairwell openings. Dont use design options. If you need to show design options, save them as separate models. Dont include columns, utility shafts or other components that dont bind occupiable spaces. Dont include doors unless they cover more than 10% of the exterior surface area. Dont use space or room separation lines. Theyre difficult to align in floor by floor and usually lead to geometry errors.
© 2012 Autodesk Energy Model Settings Before any export is done, certain settings must be checked: Volumes and Areas must be turned on Edit the Energy settings (Analyze>>Energy Analysis>>Energy Settings) Set Ground Plane. Set Project Phase. Spaces must be placed in the same phase as the Project Information phase. Energy Export Complexity set to Simple with Shading Surfaces. The limit of shading surfaces in the model is 1024. Set Sliver Space Tolerance. Leave the default value of 1 0. Note: Thermal performance characteristics of elements in the Revit physical model arent carried through to the energy analysis programs
© 2012 Autodesk OrientationLinking Models
© 2012 Autodesk Walls Exterior walls should start at the ground level and extend to the roof, or another upper bounding element Use constant thickness, different thicknesses will give you errors in your model Model spandrel glazing as an exterior wall Use interior walls to define HVAC zones on a floor by floor basis
© 2012 Autodesk More on Walls and Shading Devices Dont use interior walls as exterior walls, they wont show up in your energy modeling program Model underground walls separately and make sure neither the underground wall nor the exterior wall crosses the ground plane Model curved walls as a series of straight walls and windows Model shading devices as rectangles; use exterior walls to represent vertical shading devices and roofs for horizontal and angled shading devices
© 2012 Autodesk Roofs Roofs should all be the same thickness as floors Offset roofs properly to that a single space could encompass the entire roof and floor slab properly Roof should be offset by its thickness
© 2012 Autodesk Floors Floors should all be one thickness Floor boundaries should either be the center line, or the interior surface of the exterior walls Floors should be at the same elevation as the space Any floor extending beyond an exterior wall should be modeled in two separate pieces; a floor inside the wall and a roof outside Model slab on grades as exterior floors
© 2012 Autodesk Windows and Skylights
© 2012 Autodesk Ceilings Only use ceilings when the HVAC system type utilizes the stratification effect (i.e. UFAD or displacement ventilation) Add ceiling above the occupied volume (usually ~7) Set the space below the ceiling as occupied and above as plenum
© 2012 Autodesk Spaces Add one space, set the space number format and provide a common space type name (i.e. office). Set the height of the space to the level above if there are interior spaces on the above floor If the upper boundary is a roof, the top surface of the space must be offset by the thickness of the roof to avoid adding unnecessary shading devices to the model
© 2012 Autodesk Spaces For UFAD or displacement ventilation, the top surface must align to the ceiling Add a tag, select it and the space, and use Revit Copy (not Ctrl+C) Revit will use the same space name and will try to guess the next space number/letter; numbers/letters will increase Edit space types accordingly (i.e. non office spaces) Use the Paste Aligned feature to copy similar space layouts from one floor to another
© 2012 Autodesk Spaces Under space properties, Select whether the space is occupiable Select the Conditioning Type Edit Occupancy (People) Edit Electrical Loads Alternatively, you can use the grouped space schedule to control the parameters for a particular space type
© 2012 Autodesk Zones Must add an HVAC zone for each space Use the same numerical value as space number Recommended to add an abbreviation for the space type in the zone name
© 2012 Autodesk Zone Properties Edit the Outdoor Air information Can edit heating/cooling setpoint temperatures, but generally easier to edit these in the energy modeling tool
© 2012 Autodesk Inspect Model Geometry
© 2012 Autodesk Troubleshooting When uploading the gbXML file created in Revit to GBS, GBS may crash and not successfully upload your model Often, the error message wont provide any assistance in identifying the origin of the error To find the error in your Revit model, employ a method called Divide and Conquer Start by splitting the building in half and try uploading each side to GBS Whichever side crashes while uploading to GBS, continue splitting the model and repeat the process until you find the error If both sides of the model crash GBS, change where you split the model.
© 2012 Autodesk Creating a DOE2 Energy Model There are two classes at this Autodesk University the focus on the creating of a DOE2 energy model in eQUEST: MP3765-P Using BIM to Streamline Your Energy Model Workflows by Jeff Olden MP3784-P Calibrating an Existing Building Energy Model by Lauren Kuntz
© 2012 Autodesk BIM Geometry for Daylighting
© 2012 Autodesk BIM Geometry for Daylighting Many projects can use the geometry created for the energy model to create a daylighting model. In some situations, the geometry needs to more accurately represent the physical layout of the space within a building: Slanted or other non-horizontal ceilings used for daylighting or other architectural purposes Spaces with daylighting shelves Projects where the impacts of furniture need to be taken into consideration For these, create a separate Revit model and modify it accordingly The rest of the process will remain the same
© 2012 Autodesk Adding a Slanted Ceiling Create a level at the lowest point of the ceiling and an associated view In that view, click on Place Ceiling under the Architectural tab Set the offset to 0 and select the top boundary of the ceiling to set the slope Edit the slope designed at the boundary and finish the ceiling Check in a section view to see if it has been modeled correctly; you may need to go back and edit either the ceilings slope or offset
© 2012 Autodesk Model Setup in Revit for Daylighting In Revit, think about how the model is going to be used and how the geometry should be created to support that outcome For daylighting, utilize the series of 3D views of the various building components created in the template file to isolate like materials for exporting to FBX files. Understand the appropriate level of detail needed in the Ecotect model Give consideration to the amount of curved/rounded objects in a model; affects file sizes and time to import geometry Consider how these items impact furniture/major fixed equipment and file size of your model
© 2012 Autodesk Revit to 3ds Max Design to Ecotect Analysis
© 2012 Autodesk Exporting to 3ds Max Design In the Application pulldown menu in Revit, select Export > FBX This will export out each 3D view of like materials into an individual FBX file
© 2012 Autodesk Model Setup: 3ds Max Design Currently, 3ds Max Design is a translator for the FBX file exported from Revit to a 3DS file imported into Ecotect Analysis Before importing/exporting the models, ensure the project units are set up correctly From the Customize pulldown menu, select Units Setup: Set Display Units Scale to US Standard: Feet w/Fractional Inches 1/32 Set System Units Setup 1 Unit – 1.0 Feet
© 2012 Autodesk Model Setup: 3ds Max Design To import the FBX models, go to the Application pulldown menu, select Import>>Import and set Files of Type to Autodesk (*.FBX) and hit OK when the FBX Import dialog box pops up To export, go back to the Application pulldown menu, select Export>>Export and set Save Type to 3D Studio (*.3DS) and hit save In the dialog popup, uncheck the box for Preserve Max Texture Coordinates
© 2012 Autodesk Ecotect Analysis Model Imports To import the geometry from the.3DS file created in 3ds Max Design, go to: File>Import>3D CAD Geometry… Files of Type: 3D Studio (*3DS, *ASC, *PRJ) Remove Duplicate Faces Auto Merge Triangles Scale Objects By: Feet >Millimeters (304.8) Material – Leave it set to > Zone – Leave it set to > Import Into Existing
© 2012 Autodesk Model Setup in Ecotect May need to redefine the origins of your model geometry in Ecotect This requires defining the ground plane: Use the Set Origin button in the toolbar Define a point in the model to serve as the origin Reset World Origin Go to the Modify pulldown menu Select Transform Origin Reset World Origin If you didnt specify True North in Revit, do so in the Project Page
© 2012 Autodesk Material Assignments To apply the specific material that has been created, go to the 3D Editor Page In the Zone Management Panel: Right click on a zone in the model Right click and choose Select Objects On In the Material Assignments Panel: Select the appropriate material Select Apply Changes **To learn how to complete a daylighting model using Ecotect and Radiance, refer to the 2011 AU class MP4568-P by Brian Skripac
© 2012 Autodesk BIM Geometry for CFD Models
© 2012 Autodesk BIM Geometry for CFD Models Anything hidden in active 3D view wont be included in Simulation CFD Use visibility graphics or the hide tool to hide categories of elements Avoid small offsets between geometry; use join and align to eliminate small gaps Columns and beams can generally be omitted Fine features on furniture should be excluded (i.e. small diameter tubing, railings, rounds, fillets, holes, etc.) All models need a surrounding mass volume to represent the air surrounding a building
© 2012 Autodesk Wind Driven Models
© 2012 Autodesk Buoyancy Driven Models
© 2012 Autodesk Revit to Simulation CFD Go to the 3D view where you want to use as the basis for the CFD model Go to the Add-ins Tab and Launch Active Model Alternatively, you can export the views geometry as the.sat type of CAD file and import it into Simulation CFD or Simulation CFD 360 **To learn how to complete a CFD model using Sim CFD 360, refer to the 2012 AU class MP3397-P Taking Advantage of BIM for CFD Modeling.
© 2012 Autodesk Revit Families for Linking to Databases and Spreadsheets
© 2012 Autodesk Building Revit Families Refer to Revits Wiki help for detailed documentation on how to create Revit Families Use Reference planes and Dimension Labels to adjust the dimensions of geometry
© 2012 Autodesk Connecting to an Access Database Refer to Revits Wiki help for detailed documentation on how to install and use DB Link Use Reference planes and Dimension Labels to adjust the dimensions of geometry Limited selection of parameters that are editable in the database.
© 2012 Autodesk Autodesk, AutoCAD* [*if/when mentioned in the pertinent material, followed by an alphabetical list of all other trademarks mentioned in the material] are registered trademarks or trademarks of Autodesk, Inc., and/or its subsidiaries and/or affiliates in the USA and/or other countries. All other brand names, product names, or trademarks belong to their respective holders. Autodesk reserves the right to alter product and services offerings, and specifications and pricing at any time without notice, and is not responsible for typographical or graphical errors that may appear in this document. © 2012 Autodesk, Inc. All rights reserved.
© 2012 Autodesk Taking Advantage of BIM for CFD Modeling MP3397-P Aryn Bergman Jun Ortega Energy Analyst, TL Circle; BIM Manager, FacebookApplications.
© 2012 Autodesk MP3765-P - Using BIM to Streamline Your Energy Modeling Workflows Jeff Olden Energy Analyst.
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© 2011 Autodesk Autodesk ® Revit ® MEP Content Creation Lab MP5076-L Ryan Tivis CAD/Model Manager – Ring & DuChateau Dennis Hopper CAD/BIM Manager – GE.
© 2012 Autodesk Effective Collaboration Techniques for the Architect & Construction Engineer Using Copy Monitor in Autodesk Revit Jason Jones PES Structural.
© 2011 Autodesk Shop Drawings in Autodesk® Revit®. What? It can Do That? Ron Palma Application Specialist.
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© 2011 Autodesk Autodesk® Revit® MEP: Fast Families for Engineers David Butts BIM Specialist – Gannett Fleming.
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