2011 03-14 nahbrc-greenprints afford-housingefficiency

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  • Came in as early as we could, began tasks in addition to those they would do
  • EE/ventilation/durability considerations – an initial list from the NAHBRC
  • EE/ventilation/durability considerations – an initial list from the NAHBRC
  • Integrating needs & values
  • 2011 03-14 nahbrc-greenprints afford-housingefficiency

    1. 1. Affordable Housing Focus on EfficiencyRemodeling & Passive House Approaches Greenprints Conference March 14, 2011 Amber Wood, Manager Energy Programs NAHB Research Center
    2. 2. The NAHB Research Center’s mission . . . promote innovation in housing technology to improve the quality, durability, affordability, and environmental performance of homes and home building products. 2
    3. 3. Department of Energy Programs Building America  DOE’s residential research & development (R&D) program Builders Challenge  DOE’s energy efficiency certification for homes
    4. 4. 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
    5. 5. High Performing Home Goals  “High Performing Homes” that are  Energy efficient  Durable  Comfortable  Healthy to live in  Safe  Affordable In other words . . . Green.
    6. 6. Existing Homes Opportunities  20% of pre-1980 homes are well insulated  Air Sealing . . . & insulation  More uniform temperature  Increases comfort  Costs  Energy costs increasing  Increased retrofit costs are often offset by increasedSource: 2007 Buildings Energy DataBook, Table 4.2.1., 2005 energy cost data savings  Tax credits and rebates
    7. 7. Building America Integration  Whole-House Design  Design/Implement energy efficient solutions  Work through implementation issues  Technical product/system designs  Details  Process (quality management)  Simulations/Analysis  Cost optimization
    8. 8. Whole-House Re-Design Renewables Systems Solar Electric (PV) Wind Heating Cooling Building Right-Sized Envelope Ducts Ventilation Durability Dehumidification Moisture Safety Bulk Hot Water ($-$$$$$) Vapor Piping COST Structural Drainage Combustion Air Sealing AppliancesSTART Lead Insulation Lighting Asbestos MELsHERE Mold Moisture ENERGY EFFICIENCY 8 SAVINGS POTENTIAL
    9. 9. Montgomery CountyHabitat for Humanity
    10. 10. New Horizons for Remodeling Constraints & Design Opportunities  Durability  Energy Efficiency “Test-in” Data Identify products/methods  Details  Documentation “Test-out” Data Energy Savings Simulations Technical/professional development
    11. 11. List of EE Recommendations Moisture: Exterior grading & sump pump operation Air Sealing Insulation Ventilation Windows System Evaluations  HVAC  Ducts  Water Heating Equipment Specifications  Direct vent, minimum 92% AFUE gas furnaces  14.5 SEER cooling  size in accordance with ACCA Manual J/S  Programmable thermostats
    12. 12. List of EE Recommendations Ducts  Seal all ducts  Relocate supply and return ducts to floor  Return air paths for all rooms Duct exhaust fans to the outdoors  Kitchen  Bath MERV 8 minimum filtration Hot Water & Water Distribution  Direct vent/power vent water heaters  Insulated hot water piping  Low flow faucets, shower heads, and water closets ENERGY STAR appliances ENERGY STAR lighting Construction Sequence
    13. 13. Clear Improvement: Wall InsulationR 4.7 original to R 20 retrofit
    14. 14. Calculated Improvement Wall U-value calculation Original Block Wall Original Remodeled Block Wall Cavity Framing Isothermal Cavity Framing Isothermal still air Interior film 0.68 0.68 0.68 0.68 0.68 0.68 sheetrock Interior covering 0.45 0.45 0.45 0.45 0.45 0.45 2x4 wall Framing/cavity R 13 4.2 8.772 1" foam Interior insulation 5 5 5fir strips & air Framing/cavity R 1 0.9 0.975 4" block Block Wall 1.93 1.93 1.93 1.93 1.93 1.93 air gap Exterior air gap 1 1 1 1 1 1 brick façade Exterior covering 0.48 0.48 0.48 0.48 0.48 0.48 outside air Exterior film, winter 0.17 0.17 0.17 0.17 0.17 0.17 Isothermal Plane 4.7 R-value 19.5 R-value Parallel Path 4.7 R-value 20.8 R-value 2 * R-values in hr∙ft ∙°F/Btu
    15. 15. Other Wall Improvement Opportunities  Frame wall option 1:  Add 1” exterior insulation when siding is replaced  R 11.8 to R 17.4  Frame Wall Option 2:  Build 2x4 wall inside of 2x4 wall (both R 13)  R 11.6 to R 20.2
    16. 16. Calculated Improvement Wall U-value calculation Hathaway Addition Framed Wall Addition Remodeled Wall Cavity Framing Isothermal Cavity Framing Isothermal still air Interior film 0.68 0.68 0.68 0.68 0.68 0.68 sheetrock Interior covering 0.45 0.45 0.45 0.45 0.45 0.45 2x4 wall Framing/cavity R 13 4.2 8.772 13 4.2 8.772 OSB Exterior sheathing 0.5 0.5 0.5 0.5 0.5 0.5 1" foam Exterior rigid insulation 5 5 5 siding Exterior covering 0.61 0.61 0.61 0.61 0.61 0.61outside air Exterior film, winter 0.17 0.17 0.17 0.17 0.17 0.17 Percent of Clear 77% 23% 77% 23% Isothermal Plane 11.2 R-value 16.2 R-value Parallel Path 11.8 R-value 17.4 R-value 2 * R-values in hr∙ft ∙°F/Btu
    17. 17. Important Improvements  Moisture problems alleviated  Crawlspace/room connection sealed  Draftiness eliminated  Ducts located to conditioned space  Electrical upgrades simplified  HVAC system size limited/smaller  Energy bills reduced  Comfortable
    18. 18. Cantilever Air Sealing Opportunity • Remove soffit • Remove existing insulation • Add blocking • Foam seal floor and wall • Install insulation
    19. 19. Split Level Knee WallAir Sealing Opportunity Attic access unavailable, open wall, add air barrier and insulation
    20. 20. Energy Analysis
    21. 21. Whole-House Energy Use Estimates Source Energy Source Energy HERS Year Savings Post-Retrofit Consumption Index A House Identifier House Description Built (Mbtu/yr) Reduction (%) Estimate NotesJeffry Street Masonry/Frame Split Foyer 1959 56.19 25.44% 96Dauphine Street Masonry Split Foyer 1956 66.50 28.13% 103 CDenley Road Masonry Cape Cod 1950 41.23 17.71% 94 BPittson Road Masonry/Frame Split Level 1958 78.30 27.90% 99Goodhill Road Masonry Raised Ranch 1953 64.58 31.32% 86Middle Road Frame Raised Ranch w/add 1946/ 42.14 18.23% 110 CFarthing Drive Masonry Raised Ranch 1953 63.11 30.18% 85Denley Place Masonry Raised Ranch 1950 86.67 38.36% 83Harrell Street Masonry Raised Ranch w/add 1953/ 22.58 9.24% 90 DHathaway Drive Masonry Ranch w/add 1950/ 74.76 24.65% 100Ivy Glen Road Frame Two-story (2nd Floor add.) 1946/ 107.20 39.12% 80Napier Street Masonry Split Level 1955 97.39 33.21% 101 Average Savings 66.72 26.96%A From tax recordsB HVAC equipment was upgraded in the Pre-Retrofit condition - 92% furnace, 62%PV DHW, 13 SEER A/C.C Old HVAC equipment was retained (Dauphine - 8 SEER / 71% furnace, DHW .50); (Middle - 9 SEER / 74% furnace, DHW 63%PV)D This house retained the same conditioned square footage in the pre- and post-remodel, but increased from 3 to 5 bedrooms and 1 to 2 baths.HVAC equipment was not upgraded; 13 SEER, 80% furnace, DHW switched from .53 gas to electric 80 gallon, .86 EF.
    22. 22. www.toolbase.org 22
    23. 23. Greenbelt Homes, Inc. Privately-owned  Pilot Project cooperative  7 buildings, 28 housing units development  3 block 1,600 units  2 frame 1930’s-40’s  2 brick
    24. 24. Pilot Program Winter 2010  Pre-Retrofit baseline  Install Monitoring Equipment  Air infiltration  Temperature/Humidity/ Energy Use  Humidity Summer 2011  Retrofit building envelopes Winter 2011  Monitor envelope upgrade Summer 2012  Retrofit HVAC Winter 2012  Monitor upgrade package
    25. 25. 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
    26. 26. Resources NAHB Research Center  Corporate: www.nahbrc.com  Technical: ToolBase www.toolbase.org Remodeling Information & Case Study  www.toolbase.org/remodel Building America  www.eere.energy.gov/buildings/building_america Other Resources  www.energysavers.gov  www.energystar.gov/ia/partners/publications/pubdocs/DIY_Guid e_May_2008.pdf  www.eeba.org/bookstore/cat-Energy_Efficiency-11.aspx  http://dsireusa.org/
    27. 27. Questions? 27
    28. 28. Thank You! Amber Wood NAHB Research Center Manager, Energy Programs400 Prince George’s Blvd  Upper Marlboro, MD 20774 (direct) 301.430.6309  (fax) 301.430.6180 www.nahbrc.com

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