whole-building energy modeling with openstudio › buildings › ... · 8/24/2011 · • an...
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NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC.
Whole-Building Energy Modelingwith OpenStudio
Commercial BuildingEnergy Alliance Webinar
Nicholas Long, NRELDavid Goldwasser, NREL
August 24, 2011
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Outline
Energy Modeling Introduction OpenStudio Demo (Modeling for Retrofits) Typical Barriers to Using Simulation Conclusions and Questions
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Energy Modeling IntroductionThe Design Process
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Typical Use of Energy Modeling
Energy efficiency is often not a primary consideration during the building design process, and evidence from modeling and energy simulation is often used only to get a LEED certification if it is used at all.
Modeling for LEED Certification, Standards
Compliance, HVAC Capacity
Selection
(Limited impact)
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Source: A Handbook for Planning and Conducting Charrettes for High-Performance Projects, Second Edition , 2009, Figure 1.
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Effective Use of Energy Modeling
Energy modeling needs to be about more than getting a checkbox on a certification.
Holistic Energy-Based Design
(High impact)
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Source: A Handbook for Planning and Conducting Charrettes for High-Performance Projects, Second Edition , 2009, Figure 1.
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Why Use Energy Simulation?
• Inform energy decisions from the earliest phases• Help the design team and owner focus on energy-use
reduction• Assess predicted performance with project goals• Size renewable energy systems and
determine contribution• Evaluate design alternatives
throughout programming, design, construction, operation—as well as retrofit
• Simulation is cheaper than constructing the wrong building!
6Credit: DOE
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What Can Energy Simulation Do for My Building?
• Compare different design or retrofit optionso Load calculationso Energy performanceo Peak demando Cost-benefit calculations
• Simulate complex technologieso Naturally ventilated, passive buildingso Thermal energy storageo Daylightingo Overheating in unconditioned spaceso Advanced controls operation
• Heating, cooling equipment design• Dynamic response • Regulatory compliance• Green building ratings
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Why Use Energy Simulation for Retrofit Projects?
• Evaluate technology packageso Lighting Technology Window VLT Daylighting controls
o Envelope Changes Windows Shading devices Skylights
• Analyze specific componentso HVAC performanceo Operational characteristicso On-site renewableso Internal load reductions
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Simulation vs. Operating Energy
DOE’s analysis tools have been critical for supporting decision-making in the design and operation of buildings.
Focus on energy efficiency, then renewable energy.
Compared to simulations, real buildings typically:• Use more energy • Produce less power• Have worse controls • Have more varied schedules• Have more occupant complaints
Garbage in, garbage out.
Credit: NREL PIX9
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Thick Wall vs. Thin Wall
• Most energy modeling occurs on “Thin Wall” vs. “Thick Wall” models.
VS
Credit: David Goldwasser / NREL
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Energy Modeling IntroductionSkylight Analysis
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Skylight Analysis: Daylighting for Large Retail Building
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133,275 ft2 energy model
Add skylights and lighting controls (103,750 ft2 total)• Skylights: modeled 1% to 5% skylight to floor area (SFA) ratio in
1% increments• Skylight properties: U-Value = 0.82, SHGC = 0.49, VLT = 0.65• Lighting control: one sensor per zone, 50 footcandle set point,
continuous dimming to off
Investigate annual energy for models in 7 different climate zones
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Credit: Eric Bonnema / NREL
Skylight Analysis: 3% SFA Energy Model Rendering
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0.00 SFA 0.01 SFA 0.02 SFA 0.03 SFA 0.04 SFA 0.05 SFA
Ener
gy In
tens
ity
(kBt
u/ft
2)
Miami Phoenix Atlanta San Francisco Chicago Boulder Duluth
Curves flatten out after 3% SFA for climate zones
simulated
Skylight Analysis: Determining SFA Ratio to Report
Credit: Eric Bonnema / NREL
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Cooling11.9%
Heating5.1%
Lighting28.4%
Equipment26.3%
Fans9.0%
Refrigeration19.2%
Baseline Model
Cooling10.8%
Heating7.0%
Lighting16.0%
Equipment26.3%
Fans8.4%
Refrigeration19.2%
Savings12.3%
3% SFA Daylit Model
Skylight Analysis: Energy Savings for Atlanta, Climate Zone 3A, Hot and Humid
Credit: Eric Bonnema / NREL
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Energy Modeling IntroductionTools – EnergyPlus and OpenStudio
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What is EnergyPlus?• Fully integrated building, envelope, HVAC,
water, and renewables simulation program
• One of the most robust whole-building energy simulation tools available in the world today
• Enables integrated energy performance analysis of low-energy technologies in commercial and residential buildings including on-site generation and renewable energy systems
• Interfaces available from private sector developers
• Free
• Windows 7/XP, Linux & Mac
http://www.energyplus.gov
Credit: DOE
Credit: David Goldwasser / NREL
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What is OpenStudio?
OpenStudio is:
• An EnergyPlus/Radiance framework for national labs, code/standard officials, and third parties to easily extend the base capability of EnergyPlus for diverse purposes
• Free
• Open source
• Cross-platform
Credit: Erica Augustine / NREL
Credit: David Goldwasser / NREL
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• A plug-in to Google SketchUpo SketchUp has more than 2,000,000* users per
week worldwideo ~55% of these users are architectsoMature product with a well-defined interface for
extension
• Other front endsoResults visualizationo Simple HVAC SystemOutlineroModelEditoroRunManager
• Back-end functionalityo Scripting interfacesoWorkflow managemento Pre- and post-processing capabilitiesoComponent libraries (e.g. MELs)o Interoperability with other engines for analysis
What does OpenStudio include?
* Usage statistics released by Google in 2011. Credit: David Goldwasser / NREL
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Credit: Erica Augustine / NREL
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OpenStudio Demo (Modeling for Retrofits)
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OpenStudio DemoGeometry Input Methods
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Credit: David Goldwasser / NREL
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OpenStudio DemoGeometry From Photos of Existing Buildings (Calibration)
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Credit: David Goldwasser / NREL
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OpenStudio DemoGeometry From Photos of Existing Buildings (Modeling)
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Credit: David Goldwasser / NREL
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Credit: David Goldwasser / NREL
OpenStudio DemoVintage and Climate-Zone-Specific Constructions
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Credit: David Goldwasser / NREL
OpenStudio DemoVintage and Space-Type-Specific Internal Loads
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Credit: David Goldwasser / NREL
OpenStudio DemoRunning the EnergyPlus Simulation Through OpenStudio RunManager
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Credit: David Goldwasser / NREL
OpenStudio DemoABUPS’s Comparison for Upgraded Kitchen Equipment
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Credit: David Goldwasser / NREL
OpenStudio DemoTime-Series Simulation Data in OpenStudio ResultsViewer (Line Plot)
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Credit: David Goldwasser / NREL
OpenStudio DemoTime-Series Simulation Data in OpenStudio ResultsViewer (Flood Plot)
Kitchen - Sensible Cooling
Dining - Sensible Cooling
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Retrofit Guide PDF and Videos
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Credit: Marjorie Schott/ NREL
http://openstudio.nrel.gov/energy-modeling-retrofit-projects
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Typical Barriers to Using Simulation
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Typical Barriers to Using Simulation
Some real, some perceived• Complexity• Time investment• Experience required• Lack of data• Belief of inaccurate results
How to overcome?• Training courses• Conference proceedings (IBPSA)• Energy modeling conferences• User listservs (i.e. bldg-sim)• Software documentation• Design Guides
o ASHRAE/AIA/DOE/IES/USGBC Advanced Energy Design Guide series• Example files as starting point / wizards
o Included with some softwareo DOE’s commercial reference buildings
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Credit: Nicholas Long / NREL
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Inputs Needed for Whole-Building Simulation
• Weather Data• Ground Temperatures• Building Geometry• Window Areas• Constructions• Ground Coupling• Building Program / Thermal Zoning• Plug Loads (Electric / Gas)• Miscellaneous Electrical Loads• People Activity• Lighting Type• Infiltration• Daylighting Configuration• Schedules
• HVAC Systemso Fanso Coilso Boilerso Chillerso ERVo PTHP/VAV/etc.
• Ventilation Requirements• Exhaust Requirements• HVAC Performance Data• Control Sequences• Temperature Set Points• SWH / DHW• Water Use• Utility Rates
… and more
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Typical Barriers to Using SimulationA Solution to the Data Problem
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Credit: David Goldwasser / NREL
The Building Component Libraryhttp://bcl.nrel.gov/
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• Taxonomy of components (tags)o Includes Windows, Walls, MELs, HVAC Systems, Fans, Utility
Rates, Weather Fileso Site manages synonyms, related terms, and the hierarchy
• Description of components (attributes)o Each component type has an “infinite” number of attributeso Defines the characteristics of the components
o Length, width, location, HDD, U-Factor, SHGC, Volumetric Flow Rate, etc.
o Costs
• Other metadatao Provenance (who submitted it, when, etc.)o Files (list of files associated with the component)o Videos, images (if applicable)
The Building Component LibraryHow Components are Defined …
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Credit: David Goldwasser / NREL
The Building Component LibraryBuilding Component Library - Text Search
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Credit: David Goldwasser / NREL
The Building Component LibraryBuilding Component Library - Facets
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Credit: David Goldwasser / NREL
The Building Component LibraryViewing Components
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Credit: David Goldwasser / NREL
The Building Component LibraryViewing Components
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Conclusions
Energy modeling is useful for evaluating designs in both new and retrofit projects.
OpenStudio can support energy modeling as an integrated part of the design process, from pre-design through post occupancy.
The Building Component Library makes it easier to find reliable and appropriate energy modeling input data.
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