Revit MEP – IES Analysis - RTC Events Management MEP IES - Andrew... · • Rooms are created on a particular level in Revit and have an upper limit ... • Room upper limit set

Revit MEP – IES Analysisy

Andrew Bagnallg

GHD Pty Ltd

Summary• The BIM Concept & Building Simulation;• Introduction to Revit MEP & IES Software;;• VE-Ware – Sustainable Design at concept stage;• Preparing Revit model for export to IES for analysis;• Case Study – ABGR Computer Simulation, 257 Clarence St, Sydney;Case Study G Co pute S u at o , 5 C a e ce St, Syd ey;• Limitations;• Conclusion.

Revit MEP – IES Analysis

BIM & Building Simulation• The BIM Concept – ONE Building Model• Aim to Import Information in, not export out;p , p ;• Use Revit to create Building Geometry;• IES to calculate: Heat Loads, Energy Consumption & Daylighting;• After simulation import results file and store in model;te s u at o po t esu ts e a d sto e ode ;


IES VE Wh t i it?IES-VE – What is it?• Integrated Environmental Solutions – Virtual Environment• Suite of Software Modules including:

– ModelIT – 3D Geometry Creation– ApacheCalc – Heat Load Analysis– ApacheSim – Energy Simulations– ApacheHVAC – Detailed HVAC system creationp y– Suncast – Solar Studies– MacroFlo – Natural Ventilation Studies– MicroFlo – CFD Analysis

Radiance Daylighting and Artificial Lighting Simulation & Visualisation– Radiance –Daylighting and Artificial Lighting Simulation & Visualisation– Flucs – Daylighting & Lighting Analysis.

• Developed in Glasgow, Scotland - established June 1994;• Recently signed worldwide partnership with Autodesk to support Revit Suite;y g p p pp• Third party verified as a compliance solution, e.g. ABGR, BCA, LEED etc.


Objective:Show how to prepare a Revit model for export to IES for analysis.


Rooms• Only “room” volumes in Revit are

translated as internal spaces in IES;• To get the correct geometry in IES, the

rooms in Revit must be correctly definedR b di l i R i• Room bounding elements in Revit are the system elements: walls, floors and roofs


Rooms• The boundaries of each room

become 2D surfaces in IES representing walls, floors and ceilings. These surfaces are blue in the IES model viewer.


Shading Devices• Room bounding elements from the Revit

model that do not actually bound any rooms are imported into IES as shading surfaces

• These are yellow in the IES model viewerviewer

• Shading devices in Revit are not imported into IES unless they are room bounding system elements (walls, floorsbounding system elements (walls, floors or roofs – not ceilings)


AdjacencyThere are 3 kinds of surface in IES:• Interior surface – has an adjacent room on both sidesj• Exterior surface – has an adjacent room on one side• Shading surface – has no adjacent room


Room Boundaries• Rooms are created on a particular level in Revit

and have an upper limit• If there is no bounding roof or floor below the

upper limit, this upper limit becomes the ceiling when brought into IESW ll d f l d b hi li i• Walls and surfaces located above this upper limit will be interpreted as shading devices in IES


Example• Room upper limit set to ceiling level


Result• Surfaces not adjacent to rooms are shading elements in IES• Surfaces adjacent to attics & plenum treated as external surfacesj p


Solution 1• Make each room upper limit at the level of

the next floor or roof with zero limit offset


Solution 1


Solution 2• Create a new room in each attic and plenum

space


Solution 2


Wh t h if i itt d f th R it d l?What happens if a room is omitted from the Revit model?


S f dj t i i b h di fSurfaces adjacent missing room became shading surfaces


Transfer to IES• Windows, doors, openings and skylights hosted in room bounding elements are

transferred to IES model;• All other Revit families are lost in the transfer (for example stairs, railings, ceilings);• Create-in-place shading elements in Revit do not transfer to IES;• Information is transferred using the .gbXML format (Green Building XML) but IES

now has direct link within Revit so no exportation is necessary.


Transfer to IES

Create-in-place shadingCreate in place shading elements in Revit do not transfer to IES


Transfer to IES

Shading elements made f R it f d llfrom Revit roofs and walls transfer to IES


Main points to check if your model isn’t behaving as expected:

• Make sure “compute room volumes” is pchecked in room and area settings;

• Bounding elements have “room bounding” checked in Element P tiProperties;

• Room offsets are correct – to avoid gaps, have rooms extend to the level above or have separate plenum typeabove, or have separate plenum type rooms in the model;

• Use the “check model” option available in VE-Ware to have the room geometries checked for gaps and air spaces


Exporting model from Revit Architecture to IES




Additi l T l A il blAdditional Tools Available

IES VE-WareNe free pl g in from IES for• New free plug-in from IES for Revit allowing reporting on CO2 footprint for design on the fly

• Set model properties –location, construction types, model check (not included in Heating & Cooling Loads g gmodule)

• VE-Ware – runs through 12 months location specific climate data using calculatedclimate data using calculated Heating/Cooling loads


IES VE WIES VE-Ware• Outputs results as

report showing total CO2 emissions andCO2 emissions and breakdown of energy usage

• Architecture 2030 isArchitecture 2030 is US specific program targeting emissions reduction and n/a

t id th USoutside the US.• VE-Ware gives

architects/ mech engineers ability toengineers ability to check CO2 footprint of design throughout process


Case Study• 257 Clarence St, Sydney• 13 Levels plus ground floor and basementp g• 10 Levels (2524m2) of office space• Neighbouring buildings




C ili t d• Ceilings are represented as roof/ceilings or floor/ceilings in IES constructions

• In Revit 2008, issues may arise when curtain walls are used (eg. elements not i l d d i IES d l h lincluded in IES model, holes etc) - due to centrelines not matching & fixed in 2009


C t h d f t f b ildi• Custom shade on front of building appears in Revit, but not IES

• Shade was created as a “create-in-place” component using solidin-place component using solid and void modelling

• IES requires that any shading/ bounding elements are from a gsystem family in Revit, i.e. floors, walls, roofs

• Details like this can be added in th IES d ll if hthe IES modeller if you have a license


Preparing IES model for analysis – basic steps


C t C t ti T l tCreate Construction Templates


C t C t ti T l tCreate Construction Templates


C t Th l T l tCreate Thermal Templates• Provide details of room conditions, HVAC system, internal gains and air exchanges


C t Th l T l tCreate Thermal Templates• Provide details of loads for lighting, equipment, occupancy


C t P j t P filCreate Project Profiles• HVAC operation hours, occupancy hours, lighting hours, equipment hours


A i t ti t l t t th d lAssign construction templates to the model


A i i th l t l t t th i dAssign various thermal templates to the rooms as required


S if dj t diti f t l f if t t id i ( b t )Specify adjacent conditions for external surfaces if not outside air (eg. basements)


C t D t il d M d l f HVAC S t & C t l Al ith U i ‘A h HVAC’Create Detailed Model of HVAC System & Control Algorithms – Using ‘Apache HVAC’


R l h di l l ti U i ‘S t’Run solar shading calculations - Using ‘Suncast’


R H t L d C l l ti U i ‘A h & CIBSE L d Di l ’Run Heat Loads Calculation – Using ‘Apache & CIBSE Loads Dialogue’


R d i i l ti U i ‘A h Si ’Run dynamic simulation – Using ‘ApacheSim’


Post processing• Heat Load Analysis


Post processing• Energy Use Analysis


Australian Building Greenhouse Rating

(NABERS E )(NABERS Energy)• ABGR 4.5 Star base building rating desired• Reverse calculator downloadable free from

the website www.nabers.com.au• NABERS Guide to Building Energy

Estimation provides guidelines forEstimation provides guidelines for simulation input parameters

• Off-axis model required to investigate sub-optimal operationoptimal operation.


Energy end-use summary• Common area lighting, lifts and domestic hot water energy calculated separately

using a spreadsheet• Other energy taken from IES dynamic simulation results


ABGR Rating Tool• 5 star Base Model;• 4.5 Star Off-axis Model;;• 4.5 Star rating likely.

Revit MEP – IES Analysis Base model Off-axis model

Limitations• Limited 2-way communication between Revit & IES;• Rework in IES whenever BIM model changes & vice-versa;g ;• Inability to create user defined construction materials in Revit or use IES libraries;• Use of imperial units and overseas constructions / standards;• Inability to recognise create-in-place shading elements & complex geometry;ab ty to ecog se c eate p ace s ad g e e e ts & co p e geo et y;But…• Both software packages still in their infancy in terms of integration;• New developments & improvements occurring roughly quarterly;New developments & improvements occurring roughly quarterly;• Many improvements realised with release of Revit 2009.


Conclusions• Building Simulation is integral to the BIM concept• IES successfully integrates with Revit – speeds up model creation;y g p p ;• Some 2 way communication – Retains ‘BIM’ concept, no loss of info;• IES/Revit have a range of simulation tools available:

– VE-Ware (free) Sustainability Toolkits (Inexpensive) Full IES Suite (Expensive)( ) y ( p ) ( p )• Other alternatives:

– Green Building Studio – US Based, Purchased by Autodesk• Available free of charge

C t l i f ti l t li l ti (ABGR BCA LEED t )• Conceptual information only, not a compliance solution (ABGR, BCA, LEED etc)


Th k !Thank you!

Questions?

Andrew Bagnall

Documents

Revit MEP – IES Analysis - RTC Events Management MEP IES - Andrew... · • Rooms are created on a particular level in Revit and have an upper limit ... • Room upper limit set