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5 EXISTINGBUILDINGS
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Slide header copyIn This Chapter
> Sustainable existing buildings> Planning green projects for
existing buildings> Measures to improve existing
buildings> Retrocommissioning and
ongoing commissioning
1-15-1
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Slide header copyS
5-2
> According to Elefante, in a generation:20
Four out of five existing buildings will be renovated
But just two new buildings will be added to building stock
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Slide header copyAssessing EB Project Goals
1-15-3
> Considerations: Client motive/priority The “going-in” state of the
building Cost threshold Challenges
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Slide header copyAssessment Tools
5-4
> GBI’s CIEB Tool (pictured)
> ENERGY STAR Portfolio Manager
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Slide header copySetting Performance Targets
> Realistic return on performance
> Realistic assessment of layout and design of building/leased spaces
> Set cost expectations> Comparable building
benchmarks
1-15-
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Slide header copyMeasurement of Building Improvements
5-6
> Site energy use/Source energy use
> Carbon foot print > Water usage> Waste
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Slide header copyCommon Mistakes for EB Upgrades
> Focus on sustainability goals, not certification goals
> Recognize danger of too many improvements made without overall planning
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Slide header copyO&M Improvements
5-8
> Green cleaning> Green pest
management> Efficient lighting > Maintenance of HVAC
operations> Staff training
> Tenant education> Purchasing policies> Preventive
maintenance> Supporting commuting
alternatives> Optimizing water use
for landscaping
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Slide header copyCapital Upgrades
1-15-9
> Considerations: Nature and length of building
operations disruptions Tenant support of upgrade Engineering limitations of building Expert consultation and
recommended options
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Slide header copyCapital Upgrades for EB HVAC
5-10
> Fuel cell power generation> Chilled-water applied systems (chiller)> Off peak cooling and thermal storage
systems> Combined heat and power (CHP)
systems> Variable frequency drives (VFDs)
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Slide header copyGetting the Word Out: Greenhouse Gas Savings
> EPA Greenhouse Gas Equivalencies Calculator
> www.epa.gov/solar/energy-resources/calculator.html
1-15-11
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Slide header copyCommissioning for EB
5-12
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Slide header copy
> Identifies and addresses system inefficiencies
> Improves building’s overall performance
> Helps drive operating expenses ↓, NOI ↑
> Identifies IEQ issues
1-15-13
> Ensures owner expectations for operations
> Provides additional benefits
> Building staff well-trained
Retrocommissioning Benefits
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Slide header copyRetrocommissioning Payback (Median)
5-14
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Slide header copyRetrocommissioning as First Step
1-15-15
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Slide header copyCommissioning Challenges
5-16
> Rent structure disincentive for some owners
> Potential impact to tenant improvements already in place
> Disruption of building operations potentially impacts tenant’s business operations
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Slide header copyCase Study: Existing Building O&M
> California EPA headquarters in Sacramento
> Has become example of how small changes in building practices can significantly increase its sustainability and reduce operating expenses
1-15-17
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Slide header copyExercise: Sustainable Existing Building Concepts
5-18
Variable frequency drives (VFDs)Ongoing commissioningThermal storage systemCFLsAPPA custodial effectiveness auditHow maintenance may pay off in greater energy efficiencyGeothermal heat generationIntegrated upgrade approach
E.
B.
A.
G.
F.
H.
D.
C.