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Proposed Revision to Energy Star New Homes Deemed Savings

Proposed Revision to Energy Star New Homes Deemed Savings. September 19, 2008. Background – Why Update Savings. Current Savings Estimate Do Not Reflect Current Standards and Market Conditions Heat Pump & CAC Current Baseline = HSPF 7.0/SEER 11

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Proposed Revision to Energy Star New Homes Deemed Savings

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  1. Proposed Revision to Energy Star New Homes Deemed Savings September 19, 2008

  2. Background – Why Update Savings • Current Savings Estimate Do Not Reflect Current Standards and Market Conditions • Heat Pump & CAC • Current Baseline = HSPF 7.0/SEER 11 • Revised Baseline = HSPF 7.7/SEER 13 (New federal standard) • Energy Star minimum = HSPF 8 (original) vs. HSPF 8.5 (new) • Dishwasher • Current Baseline = EF-52 • Revised Baseline = EF-60 (AHAM 2004 sales weighted average EF) • Energy Star minimum = EF-58 (original) vs. EF-65 (new Energy Star spec) • Windows • Current Baseline = Class 40 • Revised Baseline = Class 35 (Based

  3. Background – Why Update Savings • Energy Star Lighting • Current estimates do not reflect “new construction” lighting power densities • Alternative Energy Star lighting “packages” not integrated into savings estimates • Thermal shell baseline not consistent with revised energy codes • Heat Pump “Control Mix” Do Not Reflect Results of Regional Heat Pump Evaluation • Current assumptions too pessimistic for “baseline” • PTCS assumptions slightly pessimistic, but probably OK

  4. Heat Pump Control Strategies • Ideal - ARI controller from testing method • Comfort Assist - First stage ER operates below 30º • Five Plus - 5 kW first stage with the compressor, all temperatures • Low Ambient - Compressor off below 30º, ER only • Outdoor Tstat - Ideal controller with ER lockout above 40º

  5. Current Assumed Control Weightings – Base Case

  6. Control Weightings • RTF– 2003 calculation, used current EStar calculator and “deemed savings” values • ETO—2005 weighting for Energy Trust of Oregon Resource assessment • Estar Homes—2005 weighting used in EStar savings estimates for Alliance • HP2005—Results of Heat Pump study

  7. Alternative Control Weightings Impact on Heat Pump System Efficiency & Performance

  8. Control System Assumption Impact on System Efficiency – Current Assumptions

  9. Recommended Calculator Revisions • Since Heat Pump now require Outdoor Tstat and set-up for ODT PTCS control assumptions should be revised to include “Ideal” controller and “Outdoor T” controller • Base Case control assumptions should be adjusted to more closely reflect field observations

  10. Recommended Revised Control Weightings

  11. Revised Control System Assumption Impact on System Efficiency

  12. New Home Lighting Power Densities Are Higher Than Currently Assumed Current LPD Assumption Source: NEEA New Construction Survey

  13. New Homes Have Double the Currently Assumed Number of “Sockets” Current Assumption Source:NEEA New Construction Survey

  14. CALMAC Results = No Correlation Between House Size & Average Hrs of Lighting Use Source: CFL Metering Study – Final Report. Prepared for Pacific Gas & Electric Company, San Diego Gas & Electric Company and Southern California Edison by KEMA, Inc. February 25, 2005

  15. Proposed Revised Energy Star Lighting Savings Assumptions • Current Assumptions – 15 CFLs installed per home operating 2.67 hrs/day • Proposed Revised Assumptions (and specifications) • Energy Star Lighting Package 1 (minimum) = 30 CFLs • Energy Star Lighting Package 2 = 45 CFLs* • Energy Star Lighting Package 3 = 54 CFLs** • All packages assumed to operate 2.0 hrs/day *or maximum hardwired LPD of 0.8 Watts/sq ft ** or maximum hardwired LPD of 0.6 Watts/sq ft

  16. Proposed Revised Energy Star Deemed Savings for Lighting Packages

  17. Current Baseline Thermal Shell Assumptions

  18. Proposed Revised Baseline Thermal Shell Assumptions – Alternative 1 (code)

  19. Proposed Revised Baseline Thermal Shell Assumptions – Alternative 2 (Current Practice)

  20. Estimated Energy Star Home Deemed Savings Using Alternative Thermal Shell Assumptions

  21. Proposed Thermal Shell Revisions • Alternative 1 • Uses code as baseline, avoids paying incentives to “meet” code • Does not reflect actual building practice • Alternative 2 • Reflects actual incremental improvement in thermal shell, hence savings • Does not appear to reflect current market share of Energy Star windows

  22. Current and Revised Energy Star Homes Deemed Savings - Zonal

  23. Current and Revised Energy Star Homes Deemed Savings – Heat Pump* *Do not reflect revised control assumptions

  24. Current and Revised Energy Star Homes Deemed Savings – Gas Furnace w/o CAC

  25. Current and Revised Energy Star Homes Deemed Savings – Gas Furnace w/ CAC

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