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NEEM Manufactured Homes

NEEM Manufactured Homes. Field Test Results David Baylon, Ecotope. NEEM Program. Manufacturer and State collaboration to set, update and maintain energy efficiency standards Provide QC for efficiency measures in the plant Support the promotion of energy efficient manufactured homes

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NEEM Manufactured Homes

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  1. NEEM Manufactured Homes Field Test Results David Baylon, Ecotope

  2. NEEM Program • Manufacturer and State collaboration to set, update and maintain energy efficiency standards • Provide QC for efficiency measures in the plant • Support the promotion of energy efficient manufactured homes • Built on the MAP program operated by BPA from 1992-1996, • Significant electric savings • 30 years of utility involvement

  3. Field Sample • Field Review designed to track overall performance. • Four samples since 1992. • 1992-1993, 1997-1998, 2000-2001, 2006-2007 • Sample size stratified by state, 90/10 criteria • Designed to provide overall estimates of duct leakage, air sealing, and lighting power • Protocol includes details on heating and cooling systems, occupant satisfaction, and ventilation systems.

  4. Sample Distribution

  5. Sample Characteristics

  6. Lighting Review • Establish a lighting baseline for this sector • Compare results to 2005 site built baseline • Determine the current saturation of high efficacy lighting • Develop lighting power density for manufactured homes

  7. Lighting Characteristics

  8. Lighting results • LPD about 20% lower than SF baseline • With common technologies LPD compared to SF Baseline about 15% lower • CFL saturation about twice SF Baseline • Linear Florescent shows similar saturation

  9. Ventilation systems • Average about 52 CFM average fan flow • 60 CFM in 2003 • Median fan runtime, 8 hours, similar to previous study (2003) • 35% of ventilation fans run continuously • 42% in 2003 • 31% of ventilation fans are not used, similar to 2003 survey • On average ventilation systems deliver about 0.06 ACH across the sample

  10. Blower Door Results, 1992-2007

  11. Heating Systems

  12. Heating/Cooling by State

  13. Duct Systems • 55% reduction in total duct leakage • 3.9% of floor area at 25 PA • Supply Leakage Fraction (SLF) 4.8% of system flow • Crossover installation key determinant of overall duct tightness • 60% increase in leakage for “Not Secure” crossover • Highly correlated to use of elbow at connection • About a third of homes with set-up review

  14. Duct Leakage

  15. Duct Leakage by Crossover

  16. Billing Analysis • Bills collected for the sample • 83 valid bills (87 Cases) • Billing analysis using VBDD (~PRISM) • 63 Cases used • Heat Pumps very problematic • Heating predicted in 37 weather sites • Normalized to 18 TMY3 weather sites

  17. Billing Analysis, Heating

  18. Calibration & Savings • Electric Resistance Furnace only • SEEM inputs based on • Estimated component area/assumed component spec • Measured duct leakage (NEEM runs) • Measured ACH, Adjusted for vent fan operation (NEEM runs) • Fixed window ratio (14%) • Fixed internal gains

  19. Calibration & Savings • Bills normalized to TMY3 sites • SEEM runs completed to those sites • Initial adjustments on component specs • Adjustments on infiltration estimates • SEEM runs completed for baseline assumptions • Savings calculated from each run and aggregated by climate • Program savings developed and adjusted for home size (in each zone)

  20. SEEM Calibration and Savings

  21. Results • NEEM program has developed a predictable savings mechanism for this sector. • Lighting shows some consistency with site built assumptions • Consistent effort has corrected the deficiencies over time • Billing analysis corroborates the simulation results used for NEEM savings estimates

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