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Driving Innovation in Housing Technology
BA High Performance Retrofits
Amber Wood
Manager, Energy Programs
EEBA Conference 2011
September 14, 2011
Building America
Private/public R&D partnership sponsored by DOE
Energy-efficient solutions for new and existing housing Technologies/Systems Whole-House Test Homes Quality Processes
Greenbelt Homes, Inc.
Privately-owned co-op
1,600 units 4 units/building
1930’s-40’s Roosevelt work-
force housing
1970’s Energy Upgrade
Insulation Attic Crawlspaces Exterior walls
Replace steel frame windows
Remove oil-fired boilers
Install electric baseboard
Install 52 gal electric water heaters
Upgrade electrical
4
GHI Pilot Program
Community Upgrade in 2015
7 buildings, 28 units 3 block 2 frame 2 brick
Goals: Health & safety Comfort Increased IEQ Durability
Affordability
Why?
Motivations for pilot program: Lower utility bills Comfort Lower life-cycle costs
Maintenance & replacement
Photo by Doriann Asch courtesy of www.greenbelthomes.net
Pilot Program
Baseline Monitoring (2010-2011) Pre-Retrofit baseline Install Monitoring Equipment Air infiltration Temperature/Humidity/Energy Use Humidity
Building Envelope Upgrades (2011-2012) Retrofit building envelopes Monitor envelope upgrade
HVAC Upgrades (2012-2013) Retrofit HVAC Monitor upgrade package
Pilot House Assessment
Walk-Through Evaluation Visual Inspection Homeowner Operation Utility Bills
Short-term Testing
8Photo by Celestine Ranney-Howes courtesy of www.greenbelthomes.net
Walk-Through Evaluation
Dimensions Insulation
Walls, ceilings, and foundations, Baseboard heaters
Locations , calculating capacity Hot water system Appliances
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Baseline Short-term Testing
Blower door test Multi-point house depressurization Simultaneous blower doors in
adjacent units Significant air leakage
Attic access panels Air conditioners Penetrations
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Pre-Remodel Assessment Summary
Simulation Parameters 13 of the 28 homes Painted block
End & inside units Block w/ Vinyl
End & inside units End & inside units w/
basement
Frame w/Brick End & inside units
Frame w/Vinyl End & inside units End, front addition End, side addition w/
large glass area End, full rear addition Inside, full rear addition
13Artwork by Isabelle Gournay courtesy of www.greenbelthomes.net
Beopt Energy Simulation Optimizations
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All electric Source savings = electricity savings
Annualized cost of the upgrades + utility costs 30 years at 7%
Block unit example:
Energy Simulation Optimization
Block unit example Costs & savings comparison
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Installation Costs for Building Envelope Improvements
Evaluated on a per-building basis
Do not include remediation associated with environmental hazards (such as lead paint, radon, or asbestos)
Costs are exclusive of management fees
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Durability & IAQ
Mechanical ventilation Crawlspace moisture management
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GHI Reserve Funds
Cost Analysis
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Masonry Block BuildingRecommendations
Exterior Wall Insulation R-12 (2”-3”) Finishing
Siding Ext insulation finish
system (EIFS)
Window U=0.30 &SHGC=0.30
Exterior Door U-value ≤ 0.23
Crawlspace Wall Insulation Repair Continuous R-10
Porch Slab Insulation Installation R-12 (2” closed cell
spray foam)
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Frame w/Brick BuildingRecommendations
Attic Sealing & Insulation R-38 Storage?
Create space using 2” rigid foam and OSB
Window U=0.30 &SHGC=0.30
Exterior Door U-value ≤ 0.23
Crawlspace Wall Insulation Repair Continuous R-10
Porch Slab Insulation Installation R-12 (2” closed cell
spray foam)
22Photo courtesy of www.greenbelthomes.net
Frame w/Vinyl BuildingRecommendations
Exterior Wall Insulation Taped WRB R-5 (1” rigid foam) Replace siding
Attic Sealing & Insulation R-38 Storage?
Window U=0.30
&SHGC=0.30 Exterior Door
U-value ≤ 0.23 Crawlspace Wall
Insulation Repair R-19 (3” closed cell
spray foam)
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Energy & Performance Monitoring
Indoor air temperature and relative humidity in multiple locations;
Crawlspace and outdoor temperature and relative humidity;
Heating energy use (where feasible); Hot water energy use; Dryer energy use (if applicable); and Total electric energy use.
24Photo courtesy of www.greenbelthomes.net
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Long-term Monitoring
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Energy Use Analysis
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Retrofit Solutions for Enhancing Energy Efficiency
Energy Savings: Household to National Comfort: Temperature swings to
consistency Moisture: Reduce potential problems Indoor Air: Controlled ventilation Technology: Options and performance Installation: Contractor training/QA Cost: Installation/operation/
savings Value: Demonstrate values at sale
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Questions?
Driving Innovation in Housing Technology
Thank You!
Amber Wood
NAHB Research Center
Manager, Energy Programs
400 Prince George’s Blvd Upper Marlboro, MD 20774(direct) 301.430.6309 (fax) 301.430.6180
www.nahbrc.com