2010 05-17 performing as designed - amber wood

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  • Panelized walls with gasketed SIS panels providing an additional R-5.5, WRB, and external air barrier
  • interior walls held 1" from exterior walls for continuous drywall
  • Panelized walls with gasketed SIS panels providing an additional R-5.5, WRB, and external air barrier
  • Compare two homes
  • HERS index w/ PV - 41
  • Standard house is same model, two lots away, same orientation Standard is Energy Star Major result – duct leakage to exterior =0
  • For both homes took data, estimated gas use by furnace, compared to meter reading
  • Plotted daily gas & elec use for comparison of Standard & HPH Elec use in the first part is due to ventilation and when system runs it does not run ventilation Normalized data for similar indoor temperature – eliminate variation from indoor setpoints
  • Did they achieve energy savings . . . yes, they did get there. ECM motor – blower is also more efficient in operation independent of gas use.
  • Other performance data to evaluate this coming cooling season Describe some of planned testing for duct temps in attic
  • Green – Gold on NAHB Guidelines
  • interior walls held 1" from exterior walls for continuous drywall
  • Whole house energy savings HERS index without PV (there is no PV)
  • Real world measurements achieved the level they were looking for
  • This is the type of data that we are analyzing for this home
  • Joe to add more detail . . . He will send updated table Evaluated but still checking the data, it is preliminary Loop pump about 40,000 Btu Loop 450 ft deep House is performing per the design Measured about 15% more elec use for the GSHP
  • Good performance out of system, but water is still cold, but solar contribution should increase over the summer
  • Includes all the details including ICF foundation, GHSP, solar thermal, exterior insulation, etc
  • They didn’t have gas at the site . . . spend more on HVAC, larger home
  • 2010 05-17 performing as designed - amber wood

    1. 1. Dedicated to improving home building since 1964.National Green Building Conference Performing as Designed? Real-World Analysis of Occupied High-Performance Homes Energy Estimations & Performance Data Amber Wood
    2. 2. Summary K. Hovnanian, Monmouth HPH  Energy Simulations  Monitored Data LCCTC, Green Home 1  Energy Simulations  Monitored Data p. 2
    3. 3. K. Hovnanian, NJJockey Club Subdivision Monmouth HPH Oceanport, NJ p. 3
    4. 4. K. Hov NJ • Monmouth HPH Oceanport, NJ Jockey Club Subdivision  Performance Goal Ongoing Monitoring  40% over 15 year old home (BA Mixed Humid Climate Benchmark) 2,498 sqft (single story) Increased insulation Air Sealing High Efficiency HVAC Simplified duct system  saving 28% supply duct and 70% return duct material Courtesy of www.khov.com p. 4
    5. 5. Energy Features • Monmouth HPHSystem Description SpecificationsFoundation Slab on Grade w/ 2’ Perimeter Insulation 2” XPS R-10 Panelized Walls Exterior Rigid Foam (1” SIS) R-5Walls Batt Cavity Insulation R-13 Continuous DrywallRoof / Attic Loose Fill Fiberglass R-49Windows High Performance Windows U = 0.34 / SHGC = 0.26 Gas Furnace (2-stage, ECM blower)Heating System 95% AFUE Located in Conditioned Space Central UnitCooling System 15 SEER Located in Conditioned Space Deeply Buried Supply DuctDucts Supply trunk/boots sealed w/ spray foam Simplified Return Duct (conditioned space) Tankless Navien Direct Vent Water HeaterWater Heater EF = 0.98 Centrally Located, Manifold Piping SystemLighting 90% fluorescent CFL and dimmable CFLs in recessed cansAppliances Energy Star (where supplied) Honeywell Fresh Air Ventilation System DuctedVentilation Control integrated with thermostat to Return Foam over top plates, SIS gaskets, framedAir Sealing Enhanced Air Sealing Details cavities & knee wall air barriersPV PV System 4.9 kW p. 5
    6. 6. Looking for Low Cost Solutions Monmouth HPH Issue Solution Detailed air sealing measures to achieve wholeAir sealing house performance Exterior structural insulation to increase thermal 12 ft.Increased insulation performance 9 ft.HVAC equipment &return duct system Located in conditioned space to reduce heat lossefficiency Deeply buried supply ducts to reduce heat loss &Supply duct system universal designed truss chase for multipleefficiency modelsQuality control Choose details considering builder & tradesQuality assurance Construction Monitoring Enhanced features to optimize performance andRepeatable Home cost p. 6
    7. 7. Monmouth HPH Performance Summary of major house characteristics and change from standard practiceFeature Standard Practice HPH PrototypeFoundation Slab on grade Slab on gradeWall Framing 2x4, 16” o.c. 2x4, 16” o.c. Taped seams, top/bottom plateSheathing Air Sealing None gasketsCavity Insulation R-13 batt, Class 1 R-13 batt, Class 1 Bottom plate caulked, penetrations, Bottom plate caulked, penetrations,Wall Air Sealing windows foamed, top plates windows foamed foamed from atticTruss Top cord overhang Cantilevered overhangAttic Insulation R-38, blown R-49, blownSpace Conditioning Equipment inside, ducts in truss Equipment & ducts in atticEquipment chase deeply buried p. 7
    8. 8. Simulated Energy Savings Monmouth HPH Savings from Typical Builder - 27% Savings from 15 yr Home - 46% HERS Index (no PV) - 60 p. 8
    9. 9. Performance Testing - Static Monmouth HPH Monmouth Model Monmouth ModelPerformance Metric Change Standard HPHHouse Size (sq.ft.) 2,587 2,498 - 3%House Volume (cu.ft.) 23,542 22,732Infiltration (CFM50) 2,717 1,021Infiltration (ACH50) 6.9 2.7 - 61%Infiltration (ACHnat) 0.37 0.15Normalized (CFM50/sq.ft.) 1.05 0.41Total Duct Leakage (CFM25) 165 85 - 48%Duct Leakage to Outside (CFM25) 74 0 - 100% Implementing HPH design features p. 9
    10. 10. Performance Monitoring Monmouth HPH For HPH and Standard Model:  Indoor and Outdoor Temperatures  Furnace plenum temperature  Furnace electricity Estimated burner operation  Compared with meter readings  Calibrated with constant temperature setting p. 10
    11. 11. For 2-Month Period p. 11
    12. 12. Summary of Heating Energy Use Monmouth HPHPerformance Metric Monmouth Monmouth ChangeDec ‘09 – Jan ’10 Model Standard Model HPHGas Heating Energy (therms) 286 137 - 52%Furnace Electricity (kWh) 335 145 - 57% p. 12
    13. 13. Building America Cost Analysis Monmouth HPH Amortized Annual Cost Total CostMeasure Upgrade Cost (30 yr mortgage, 7% + 10% markup interest)Total Energy Efficiency $1,421 $1,563 $125InvestmentSite Generation $25,210 $27,731 $2,214Total with Site Generation $26,631 $29,294 $2,339Builder Tax Credit - $2,000 - $2,000 - $160Federal Solar Tax Credit - $7,515 - $7,515 - $600Total Incremental Cost to $17,116 $19,779 $1,579Buyer Including Incentives p. 13
    14. 14. Building America Homeowner Cash Flow Annual Electric Energy Annual Gas Energy (Site) (Site) Local Annual Utility Marginal Local Prototype Prototype Bill Reduction Electricity Marginal Benchmark House Benchmark House vs Benchmark Price Gas PriceEnd Use (kWh/yr) (kWh/yr) (therms/yr) (therms/yr) ($/yr) ($/kWh) ($/therm)Space Heating 851 335 1365 495 $1,180 $0.17 $1.26Space Cooling 2,720 743 $326DHW 0 0 211 111 $126Lighting 2,801 2,168 $104Appliances and MELs 4,572 4,884 66 53 ($35)Ventilation 236 196 $7Total Usage 11,180 8,326 1,642 659 $1,709Site Generation 4,897 $808Net Energy Use 11,180 3,429 1,642 659 $2,517Added Annual Mortgage Cost $125 Neutral Cost Criteria Met?w/o Site Gen.Net Cash Flow to Consumer $1,584 Yesw/o Site Gen.Added Annual Mortgage Cost $2,339 Neutral Cost Criteria Met?with Site Gen.Net Cash Flow to Consumer $178 Yeswith Site Gen. w/o IncentivesAdded Annual Mortgage Cost $1,579 Neutral Cost Criteria Met?with Site Gen. & IncentivesNet Cash Flow to Consumer $937 Yeswith Site Gen. & Incentives p. 14
    15. 15. Builders Challenge for Monmouth HPH p. 15
    16. 16. Monmouth HPH Research Evaluate performance of duct system  Duct surface temperatures  Attic air temperatures and relative humidity  Ambient temperatures and relative humidity Energy use of high efficiency cooling system p. 16
    17. 17. Lancaster County Career &Technology Center (LCCTC) Green Home 1 Mt. Joy, PA p. 17
    18. 18. LCCTC • Green Home 1 Mt. Joy, PA Ongoing Monitoring Cold Climate 4,055 sqft 2,696 above grade First of 4 homes at this campus Built by Students Green features  Designed Gold on NAHB Guidelines p. 18
    19. 19. Energy Features • Green Home 1System Description SpecificationsFoundation Full basement R-22 ICF basement 2x4 framing R-15Walls Spray Cellulose Insulation R-5.5 Exterior Rigid FoamRoof / Attic Blown Cellulose R-49Windows High Performance Low-E Windows U = 0.30 / SHGC = 0.29 GSHPHeating System 4.0 COP (Manufacturer full load) Located in Conditioned Space GSHPCooling System 18.2 EER (Manufacturer full load) Located in Conditioned Space Well sealed ductsDucts Sealed with Butyl Tape Located in Conditioned Space Solar Water Heating System Flat Plate, Closed loop, 42 sqft systemWater Heater Electric Tankless Backup 80 gallon solar storage tank Manifold Piping Design LED and fluorescent lampsLighting High Efficiency Lighting Tubular skylightsAppliances Energy Star (where supplied)Ventilation ERV Fresh Air Ventilation Ducted to Return Control integrated with thermostat Foamed band areas, top plates, andAir Sealing Air Sealing thermal bypass p. 19
    20. 20. Simulated Energy Savings Green Home 1 Savings from Typical Regional - 43% Savings from 15 yr Home - 54% HERS Index - 57 p. 20
    21. 21. Energy Savings Green Home 1 p. 21
    22. 22. Energy Savings Green Home 1 p. 22
    23. 23. LCCTC Performance Data Significant air-sealing details  Taped exterior foam and drainage plane  Air sealed top plates  2.35 ACH50 (< 0.15 ACHnat) Duct system sealed using butyl mastic tape  0 duct loss to exterior p. 23
    24. 24. GSHP Performance Summary Green Home 1 Ground Source Heat Pump Energy Use and HDD 70 18 16 60 14 50 n p _ -T g 12 r t ) l 40 10 30 8 6 20 4 10 O D 2 p d n P C e _ T a g y r t ( l i 0 0WGHDphdnP 10/6/2009 11/6/2009 12/6/2009 1/6/2010eTaEkgySFr)(,lHeating Degree Days (Base 65) GSHP Energy, kWhMin of Tgrlp_Ent Min Daily COP Avg COP during steady-state operation: 6.0Delta Tgrlp (daily average) Avg system COP for period: 5.17 p. 24
    25. 25. Preliminary Heating Performance Data p. 25
    26. 26. Water Heating System Performance Green Home 1 Hybrid Water Heating Performance (10/6/09 to 5/12/2010)Total Hot Water Supplied 1792 kWh Solar supply 1020 kWh Electric supply 996 kWh Losses Tank 153 kWh System (piping) 71 kWh Solar Contribution to Hot Water Energy Use 51% p. 26
    27. 27. Building America Cost Analysis Green Home 1 Amortized Annual Cost Total CostMeasure Upgrade Cost (30 yr mortgage, 7% + 10% markup interest)Total Energy Efficiency $28,343 $31,177 $2,489InvestmentSite Generation $0 $0 $0Total with Site Generation $28,343 $31,177 $2,489Builder Tax Credit - $2,000 - $2,000 - $160Solar Water Heating, - $2,393 - $2,393 - $191Federal Tax CreditGeothermal System, - $3,022 - $3,022 - $241Federal Tax CreditTotal Incremental Cost to $20,929 $23,763 $1,897Buyer Including Incentives p. 27
    28. 28. Building America Homeowner Cash Flow Annual Electric Energy (Site) Local Annual Utility Marginal Local Prototype Bill Reduction Electricity Marginal Benchmark House vs Benchmark Price Gas Price End Use (kWh/yr) (kWh/yr) ($/yr) ($/kWh) ($/therm) Space Heating 12,647 3,264 $1,220 $0.13 $1.19 Space Cooling 3,024 533 $324 DHW 4,467 1,893 $335 Lighting 2,867 1,380 $193 Appliances and MELs 6,396 6,102 $38 Ventilation 242 484 ($31) Total Usage 29,643 13,656 $2,078 Site Generation $0 Net Energy Use 29,643 13,656 $2,078 Added Annual Mortgage Cost $2,489 Neutral Cost Criteria Met? w/o Site Gen. Net Cash Flow to Consumer ($411) No w/o Site Gen. Added Annual Mortgage Cost $1,897 Neutral Cost Criteria Met? with Site Gen. & Incentives Net Cash Flow to Consumer $181 Yes with Site Gen. & Incentives p. 28
    29. 29. Rainwater System Performance Green Home 1 Water supplied to toilets, laundry, and outdoors by rainwater: 89% Household water supplied by rain*: 43.8%  Utility water supply, gallons per day: 85  Rainwater supply to house, gallons per day: 66 Potable water saved due to rainwater collection, gallons (since 10/6/2009): approximately 14,500 *approximate for period from January to mid-May, 2010 p. 29
    30. 30. Dedicated to improving home building since 1964. Amber Wood Program Manger Energy Efficiency 301-430-6309 awood@nahbrc.com  NAHB Research Center 400 Prince George’s Blvd Upper Marlboro, MD 20774  (toll-free) 800-638-8556 (fax) 301-430-6180  www.nahbrc.com

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