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2010 07-15 rbeem nahbrc marine miranda 07-15-10
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2010 07-15 rbeem nahbrc marine miranda 07-15-10

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  • Typical code – Oregon code
  • Harbor House 1 experienced milder weather conditionsWhile the temperatures vary, they appear sufficiently close for a meaningful comparison.
  • The heating system analysis attempts to use statistical methods remove ambient temperature data as a variable
  • Vertical integration from load and bracing design and layout to stud and truss fabrication through mechanicals and finish

Transcript

  • 1. Marine Climate Case Study Miranda Homes NAHB Research CenterResidential Building Energy Efficiency Meeting July 2010
  • 2. Summary  Details  Unique aspects  Construction  Energy Analysis  Energy Monitoring  Comparison p. 2
  • 3. Project Location p. 3
  • 4. Miranda Homes • Harbor View Clackamas, OR p. 4
  • 5. Miranda Homes • Harbor View Clackamas, OR  Harbor View Model  Harbor Home 1  Marine Climate  1,569 sqft  Crawlspace foundation  Panelized Walls  Steel framed homes  Affordable, ↓cycle time p. 5
  • 6. Details Miranda Homes • Harbor Home 1 System Description SpecificationsFoundation Unvented Crawlspace R-23 (ICF) Panelized Walls Advanced steel framing (2 x 6) Continuous Sheathing OSBWalls Spray Foam Insulation R-24 Exterior Rigid Foam Insulation R-4.4Roof / Attic Spray Foam R-45 unvented atticWindows High Performance Windows Low-e; U = 0.30 / SHGC = 0.31 Electric Heat PumpHeating System Located in Conditioned Space 8.5 HSPF Central UnitCooling System 15 SEER Located in Conditioned Space 100% interiorDucts Located in Conditioned Space 5% leakage to exterior (28.4 cfm25)Ventilation Fresh Air Ventilation 38 cfm exhaust ventilationWater Heater Electric Hot Water Heater 0.92 EF electric tankLighting 75% fluorescent CFL and permanentAppliances Energy Star (where supplied)Air Infiltration Air Sealing Details 2.31 ACH50 p. 6
  • 7. Construction ProcessMiranda Homes • Harbor Home 1  Manufacture steel studs  Panelize Walls  Steel studs  OSB  Exterior rigid foam  Set walls on foundation  ICF  Conditioned crawl  Manufacture roof trusses  All SPF insulation AG p. 7
  • 8. Panelized 2x6 WallsMiranda Homes • Harbor Home 1 p. 8
  • 9. Wall InteriorMiranda Homes • Harbor Home 1 p. 9
  • 10. Spray Foam AppliedMiranda Homes • Harbor Home 1 p. 10
  • 11. Ducts & HVACMiranda Homes • Harbor Home 1 p. 11
  • 12. Lighting & AppliancesMiranda Homes • Harbor Home 1 p. 12
  • 13. Energy Analysis Miranda Homes • Harbor Home 1House Feature Typical Construction Miranda Homes DesignFloor Area 1569 square feet, single story 1569 square feet, single storyWindow area 252 square feet 252 square feetFoundation Crawlspace, R-30 floor Crawlspace, conditioned, R-23Bathrooms 2 2Ceiling Flat ceiling, vented attic R38 Unvented attic, R-45Roof framing Wood MetalWall framing Wood, 2x6, advanced framing Metal, 2x6, 20% framing factor1Wall insulation R-19 cavity R-24 cavity, R-4.35 exteriorWindows U-0.35/0.4 SHGC U-0.30/0.31 SHGCInfiltration 0.35 ACHnat2 0.122 ACHnatVentilation None 100 CFM, runtime 20% minimumCooling System Efficiency 13 SEER 15.5 SEERHeating System Efficiency 7.7 HSPF 8.5 HSPFDuct Location Interior/Crawlspace, insulated InteriorDuct sealing Assumed air-tight As measuredTemperature Set-point 76 Cooling – 71 Heating 76 Cooling – 71 HeatingLighting Energy 2,064 kWh/yr 1,183 kWh/yearAppliances and Plug 4,399 kWh/yr 4,399 kWh/yr1 Framing system optimized using panelization software and engineered components2 Based on ASHRAE 62.2 minimum infiltration before mechanical ventilation required p. 13
  • 14. Energy AnalysisMiranda Homes • Harbor Home 1  46% Energy Savings  Over BA Benchmark  HERS Index  69 (w/out PV) p. 14
  • 15. MonitoringMiranda Homes • Harbor Home 1  Instruments were installed to monitor:  Indoor and outdoor temperatures  Whole-house electricity use  Heating system electricity use  Water heating electricity use  Duct supply and ventilation temperatures p. 15
  • 16. Weather Data Comparison Heating Degree Days  Temperature difference between indoors & out  During monitoring period  15% fewer heating degree days  2,941 HDD monitored  3,468 HDD simulations p. 16
  • 17. Weather Data Comparison Daily Temperature Profile p. 17
  • 18. Temperature DataDaily Average Temperature Profile p. 18
  • 19. Temperature Data Profile Measured Temp  Daily Average: ≈ 2°F higher than TMY3  Average Min: ≈ 1°F higher  Average Max: ≈ 3°F higher  Average Interior: within 1°F  Daily Interior temperature range is larger (over 2°F during heating season) p. 19
  • 20. Monitored DataMiranda Homes • Harbor Home 1 p. 20
  • 21. Performance Comparison Simulated vs. Measured for Period Difference between Simulation Measured Performance Metric Unit Measured and Data Data Simulated DataAverage Outdoor Temperature 48.3 49.0 °F +0.7 °FAverage Daily Maximum 56.6 60.1 °F +3.5 °FTemperatureAverage Daily Minimum 39.9 41.0 °F +1.1 °FTemperatureAverage Indoor Temperature 71.7 70.8 °F -0.9 °FHeating Energy Use 2,646 2,319 kWh -12.4%Hot Water Energy Use 1,819 1,427 kWh -21.6%Appliance and Lighting Energy 3,179 2,692 kWh -15.3%UseWhole House Energy Use 7,644 6,438 kWh -15.8% p. 21
  • 22. Heating ComparisonElectric Energy & Temperature p. 22
  • 23. Heating Comparison Heating System Performance p. 23
  • 24. Company StructureMiranda Homes • Harbor Home 1  Miranda Homes staff construct homes  Vertically integrated  Minimize construction time  Minimize callbacks  Integrated Quality Management p. 24
  • 25. Conclusions & Next Steps Miranda Homes • Harbor Home 1 Energy efficiency  Simulation model enhancements have adequately predicts enabled successful energy usage use of steel framing  Further analysis is Monitored data is needed using annual fairly well matched data with predicted data  Based on data further & confirms savings enhancements may be identified p. 25
  • 26. Questions? Amber WoodProgram Manager, Energy Efficiency NAHB Research Center 301-430-6309 awood@nahbrc.com p. 26