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2011 01-15 nahbrc - whole-house energy retrofits

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  • NAHB Research Center / Building America
  • Optimize Features Climate Considerations First Envelope Second System Energy Standard
  • Framing – beyond thermal bypass Ducts – sizing, return air, pressure balance, leakage HVAC – min SEER, loads (manual J), ventilation,
  • NAHB Research Center / Building America
  • Transcript

    • 1. Challenges & Opportunities ofWhole-House Energy Retrofits Hawthorne House 2011 IBS Saturday, January 15 8:00 – 9:30 am
    • 2. Project & Climate  John Wesley Miller Companies  Tucson, AZ  Hot-mixed Dry  Climate Zone 2  Hawthorne House  Built in 1961  1,990 square feet  4 bedrooms, 2 baths  Unoccupied “gut-rehab”
    • 3. Goals Project Goals:  Durability  Energy Efficiency  Green  Accessibility  Technological Innovation . . . a high performance home.
    • 4. Whole-House Optimization  Optimize Energy & Green  Climate Considerations  Whole-house Analysis  1. Envelope  2. Systems  3. Renewables  Building Materials  Local materials  Durability  Performance  Cost
    • 5. Optimized Envelope Over original adobe walls  1 ½” exterior insulation (R-10)  Attached using z-strips  Finished with 3-coat stucco Remove roofing & install  2” R-13 polyiso rigid insulation  3-ply built-up roof  Painted reflective white
    • 6. Optimized Envelope  Replace windows  Dual-pane low-e, argon  U-value: 0.31, SHGC: 0.30  Air Seal  Carefully sealed  Tested by TEP  New Garage  Detached
    • 7. Optimized Systems High Efficiency Space Heating & Cooling  Air to Air Heat Pump  Dual Compressor 19/17.6 SEER  Tested duct leakage (not exceeding 5% of air handler flow) Mechanical Ventilation  Central exhaust fan  Fresh air to central return
    • 8. Optimized Systems & Renewables  Solar Hot Water Preheat System  Integrated collector storage (ICS) solar preheat  Electric tankless backup water heater  Solar Electric PV System  1.6 kW (DC) PV System
    • 9. Costs
    • 10. Programs & Incentives Building America Tucson Electric Power’s (TEP’s) Guarantee program  5 year heating/cooling & comfort Tucson Sustainable Energy Standard Local & State Tax Incentives Awards  EnergyValue Housing Award  Southern Arizona HBA’s Builder of the Year  Arizona’s Innovation Award
    • 11. Quality Assurance & Testing TEP Third-Party Guarantee ProgramTesting Framing Insulation Installation Air Sealing Testing Window Verification Ducts HVAC Lighting
    • 12. Integrated Marketing Messaging  Third Party Certification  Energy Efficiency  Energy  Green  Quality  Solar Incentives  Awards  Local & Utility  State  Federal
    • 13. Photos?
    • 14. Armory Park del Sol (APdS)  John Wesley Miller Companies  Tucson, AZ  Hot-mixed Dry  Climate Zone 2  14 Acre, 99 lot redevelopment  88 homes  Used APdS specs in Hawthorne House
    • 15. What is the right question? Dedication Whole-House Energy Efficiency Quality Management Incentives Correlation of water & energy savings “Boy Scout” approach to energy & green building programs
    • 16. Resources John Wesley Miller Companies  http://johnwesleymillercompanies.com/hawthornehouse.html BA Best Practices  http://apps1.eere.energy.gov/buildings/publications/pdfs/building _america/ba_cs_retrofit_john_wesley_miller.pdf NAHB Research Center  Corporate: www.nahbrc.com  Technical: www.toolbase.org
    • 17. Questions?This concludes The American Institute of Architects Continuing Education Systems Program Amber Wood Manager, Energy Programs 301-430-6309 awood@nahbrc.com