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April 8th 2013
California’s Commercial Building Energy Asset Rating System (BEARS)
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Acknowledgements
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An Energy Asset Rating…
…evaluates the energy efficiency potential of a
building
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An Energy Asset Rating…
…evaluates the energy efficiency potential of a
building based on its construction, installed
energy-consuming systems, and renewable
energy systems.
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An Energy Asset Rating…
…evaluates the energy efficiency potential of a
building based on its construction, installed
energy-consuming systems, and renewable
energy systems. Energy asset rating should
not be considered an estimate of a building’s
actual energy use
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An Energy Asset Rating…
…evaluates the energy efficiency potential of a
building based on its construction, installed
energy-consuming systems, and renewable
energy systems. Energy asset rating should
not be considered an estimate of a building’s
actual energy use, rather it is designed to give
the owner an idea of the energy efficiency
potential of the building independent of the
way the building is currently operated.
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An Energy Asset Rating…
…evaluates the energy efficiency potential of a
building based on its construction, installed
energy-consuming systems, and renewable
energy systems. Energy asset rating should
not be considered an estimate of a building’s
actual energy use, rather it is designed to give
the owner an idea of the energy efficiency
potential of the building independent of the
way the building is currently operated. This
perspective enables a reasonable comparison
of a building’s energy efficiency potential to
other buildings.
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Which is Getting Better MPG?
http://www.curbsideclassic.com/auto-biography/the-great-american-anti-towing-conspiracy/
http://tourismplacesworld.blogspot.com/2011/08/worlds-steepest-street.html
~20 MPG ~100 MPG
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Which is More Efficient?
http://blacktagdiaries.blogspot.com/2010/06/sad-day-for-prius.html
http://tourismplacesworld.blogspot.com/2011/08/worlds-steepest-street.html
50 MPG 20 MPG20 MPG50 MPG
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Role of an Asset Rating
• Real estate transactions
• Inform policy goals
• Demonstrate benefits of energy efficiency
• Prioritize energy efficiency investments
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Data Collection
Data Analysis
Rating Calculation
Rating Communication
BEARS Rating Process
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Data Collection
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Input Parameter Electric GasEquipment Power Density 49.37% 1.46%Lighting Power Density 21.74% 0.23%Cooling Efficiency 11.51% 0.00%Window Area with Daylight Control 5.50% 0.00%Roof Reflectivity 5.47% 0.06%Glazing (solar heat gain coefficient) 5.23% 0.18%Daylight Controls 4.92% 0.06%HVAC System Type 3.73% 0.23%Fan Static Pressure 3.49% 0.06%Window Area with no Daylight Control 3.44% 0.00%Infiltration 0.96% 0.23%Roof Insulation 0.74% 0.12%Glazing U-Value 0.57% 0.06%Domestic Water Heating Efficiency 0.00% 42.69%Wall Insulation 0.35% 0.06%Heating Efficiency 0.03% 0.06%Ventilation Airflow 0.00% 0.00%
Sensitivity Analysis
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Data Collection Considerations
Sensitive Parameters Non-Sensitive Parameters
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Energy Modeling
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DOE Reference Buildings
• EnergyPlus• ASHRAE 90.1 and 62.1• 16 building types• Represents 70% of the commercial building
stock
http://apps1.eere.energy.gov/buildings/energyplus/openstudio.cfm
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Building TypesProposed BEARS
Building TypesDOE Reference
Building AvailableModify DOE
Reference BuildingNew Modeling
Protocols Required
Large Office x Medium Office x Small Office x Data Processing/Computer Center x Lab/R&D Facility xQuick Service Restaurant x Full Service Restaurant x Bar/Tavern/Nightclub/Similar x Supermarket x Convenience Store x Stand-alone Retail x Strip Mall x Refrigerated Warehouse x Unconditioned Warehouse x Conditioned Warehouse x Small Hotel x Large Hotel x Primary School x Secondary School x College or University x Religious Assembly xHealth/Fitness Center xTheater/Performing Arts xLibrary/Museum xConference/Convention Center xOther Recreational/Public Assembly xService xAssembly/Light Mfg. xPolice/Fire Stations x
Data TranslationData Collection Field Data Collection
ParameterEnergyPlus Translation
Occupancy Type Medium Office Schedule = M-F 7:00-7:00, Occupancy Density, Ventilation Rate
Vintage 1995 Default constructions and efficiency values to Title 24 requirements in place in 1995
Interior Lighting Power Controls
Occupancy Sensors Apply power factor adjustment based on assumed space type
Data Collection Field Data Collection Parameter
EnergyPlus Translation
Occupancy Type Medium Office Schedule = M-F 7:00-7:00, Occupancy Density, Ventilation Rate
Vintage 1995 Default constructions and efficiency values to Title 24 requirements in place in 1995
Interior Lighting Power Controls
Occupancy Sensors Apply power factor adjustment based on assumed space type
Data Collection Field Data Collection Parameter
EnergyPlus Translation
Occupancy Type Medium Office Schedule = M-F 7:00-7:00, Occupancy Density, Ventilation Rate
Vintage 1995 Default constructions and efficiency values to Title 24 requirements in place in 1995
Interior Lighting Power Controls
Occupancy Sensors Apply power factor adjustment based on assumed space type
Data Collection Field Data Collection Parameter
EnergyPlus Translation
Occupancy Type Medium Office Schedule = M-F 7:00-7:00, Occupancy Density, Ventilation Rate
Vintage 1995 Default constructions and efficiency values to Title 24 requirements in place in 1995
Interior Lighting Power Controls
Occupancy Sensors Apply power factor adjustment based on assumed space type
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Field Surveys
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Data Collection Testing
• 5 sites• Café• Two Office Buildings• Quickserve Restaurant• Grocery Store
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BEARS Rating
BEARS Certificate2012 PROTO
TYPE: NOT FINAL
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Future of BEARS
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Future of BEARS
• Testing• Refine framework• Develop assessor training• Develop BEARS software tool• Grow scope to include more buildings
BEARS provides a new way of thinking about the value of a building’s permanent assets, and creates a more robust link between energy efficiency and property value
