From Blueprint to Footprint Making Energy Efficient Design...
Transcript of From Blueprint to Footprint Making Energy Efficient Design...
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Building Bridges to Net Zero
From Blueprint to Footprint
Making Energy Efficient Design a Reality
Gina Buffone, Director New Construction AEA
Amrit Kaur, Energy Efficiency Engineer AEA
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MULTIFAMILY BUILDINGS 2015: BUILDING BRIDGES TO NET ZERO
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Presentation Outline
Introduction
Objectives
Stages from Intake to Operation
Document Review
Construction Management
Conclusion
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Objectives: Predictions vs. Performance
Achieving a whole building approach
Optimal design strategies to reduce energy consumption
What works? What doesn’t?
Challenges: Missing links to efficiency
– Fragmented Sector - Many professionals involved at different stages
– Incomplete detailing
– Lack of education and involvement of stakeholders
– Lack of follow-up
Ensuring design intent is carried out though construction
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Project Stages
Stages from Intake to Operation
OWNERS & DEVELOPERS
ARCHITECTS & ENGINEERS
GENERAL CONTRACTORS
TENANTS & MANAGEMENT
Outreach / Intake
Schematic Design
Design Development
Construction Management
Operations & Maintenance
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Changes vs Flexibility vs Cost
Stages from Intake to Operation
Outreach / Intake SchematicDesign
DesignDevelopment
ConstructionManagement
Operations &Maintenance
Hig
h
IMP
AC
T
Low
Building performance Cost and
disruption
TIME (Source: Solidar, Berlin Germany)
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Document Review
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Document Review
Building a line of Communication
• Architectural Drawings
• MEP Drawings
• Specifications
• Manual J Calculations
• Comcheck Reports
• Submittals
• Construction Schedule
Scope of Work
• Conduct a kickoff meeting
• Email the agenda to the team
• Keep discussion on track
• Everyone must be clear on the next step
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Document Review
Document Review
Envelope
Insulation
Windows
Thermal Bridging
Air Sealing
Lighting
LPD (W/sqft)
Sensors
Heating & DHW
Sizing
Efficiency
Piping
Controls
Appliance
ES Label
Ventilation
Sizing
Efficiency
Controls
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Document Review
Making important choices – Window Types
(Source: www.homepower.com)
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Document Review
Energy Efficient Windows
Frame Material
Spacer Material
Number of Panes
Gas Between
Panes
Glazing
Emissivity
ELEVATION DETAIL PARAMETERS
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Document Review
Key performance Measures
U-factor
Air Leakage
SHGC
Visible Transmittance
Condensation Resistance
Energy Efficient Windows
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Document Review
Energy Efficient Windows
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Document Review
Thermal Bridging
Occurs when a highly conductive
material by-passes insulation layer
Thermal Bridges in Buildings:
- Wood framing or steel framing
(studs, plates) in insulated wall
- Concrete slab edge (balcony,
parapet, exposed slab edge)
through a wall
- Windows & installation details
through insulated walls
Energy code compliance
Comfort Implications
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Document Review
Thermal Bridging – Window Detail
BEFORE AFTER
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INT
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INT
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BEFORE
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Document Review
Thermal Bridging – Window Detail
BEFORE AFTER
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Document Review
Thermal Bridging – Parapet Detail
EX
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Document Review
Problems:
Comfort
Wear and Tear
Initial & Operating Cost
Why:
Fear of under sizing
Rule of thumb calculation
Energy Improvements
Financial disincentive
Oversized Heating Systems
Why bigger is not always better
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Document Review
Common Mistakes:
Window/Wall area
Insulation levels
Air infiltration rates
The number and type of
occupants
Occupant comfort
preferences
Oversized Heating Systems
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Document Review
Portfolio of 6 existing
bldgs.
Oversized by 40-60%
Lower total installed
boiler capacity by 2400
MBH
Lower installed cost
Lower operating cost
Increased comfort
Oversized Heating Systems
Building 1 Building 2 Building 3 Building 4 Building 5 Building 6
Original 1700 1700 1200 1200 1400 600
Revised 1200 1200 800 800 1000 400
0
200
400
600
800
1,000
1,200
1,400
1,600
1,800
Bo
ile
r C
ap
ac
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MB
H)
Boiler Installed Capacity
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Construction Management
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Construction Management
Continuous exterior insulation with minimum 2/3
exterior and 1/3 interior
Minimize thermal bridging
Air seal
Exterior Envelope
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Construction Management
Reduce thermal bridging
Insulate window surrounds
Windows
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Construction Management
Thorough Air Sealing
BAD
BAD
GOOD
GOOD
EVERY penetration, seam, and joint
gets sealed (not just what you see)
BAD
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Construction Management
The Devil is in the Details
Importance of Mockups
– Window / Exterior wall
– Apartment unit
Undermining completed work
Proper installations
BAD
GOOD
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Construction Management
Seal ALL sides
Assemble on ground or mastic each piece during assembly
Duct Sealing
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Construction Management
Testing: The Key to Success
Blower door
Duct tightness
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Education
Design Professional Awareness
Contractor Training
- Seeing is believing: building testing
Operations Training
- Design systems with building maintenance staff in
mind and ensure adequate training
Resident Awareness
- Eliminate opening windows and removing faucet air-
rater syndrome
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Follow up
System Commissioning
Benchmarking
Example of benchmarking results in client portfolio
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The Ultimate Goal
Striving for the Greatest Energy Efficiency
– Passive House: 80+% savings on heating
– Net Zero
“Vision without action is merely a dream and action without vision just passes the time, but
vision with action can change the world.” – Joel Barker
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MULTIFAMILY BUILDINGS 2015: BUILDING BRIDGES TO NET ZERO
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Questions?
Gina Buffone, Director New Construction AEA
Amrit Kaur, Energy Efficiency Engineer AEA
Thank you!