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HEADING TO NET-ZERO BY 2020

Jim Parks EECR&D Manager Energy Efficiency and Customer Research and Development. HEADING TO NET-ZERO BY 2020 . Background. Building America – A Voluntary US Department of Energy Program Goals 60% Reduction in Energy Bill Initially Target Annual Net-Zero Electricity Use

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HEADING TO NET-ZERO BY 2020

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  1. Jim Parks EECR&D Manager Energy Efficiency and Customer Research and Development HEADING TO NET-ZERO BY 2020

  2. Background • Building America – A Voluntary US Department of Energy Program • Goals • 60% Reduction in Energy Bill Initially • Target Annual Net-Zero Electricity Use • Use Commercially Available Technologies • Annual Net-Zero Energy Use by 2020

  3. Initial Foray into ZEH • Optional PV combined with EE • Beazer Powerhouse 2000-02 • 5 Subdivisions/18 PV Installs • Entry level • Optional PV • 3,300 Watt ac • Morrison Homes Lakeside 2003 • 12 PV homes out of 90+ homes • Move-up, in-fill project • Spec’d and Optional Upgrade • >30% Title-24, 2 kW ac Solar

  4. A Step Up • PV in all homes + EE • Premier Homes Premier Gardens 2004-05 • 95 units • Entry level, in-fill project • >30% Title-24, 2 kW PV • Standard Feature • Treasure Homes 2006-07 • 32 units • Entry level, in-fill project • >40% Title-24, 2 kW PV • Standard Feature

  5. Features 40% Better Than 2005 Title-24 Standards Measure Base ZEH Attic Insulation R-38 R-38 Radiant Barrier No Yes Wall Insulation R-13 R-13 + 1” R-4.2 Foam Quality Installation NoYes Low Air Infiltration Yes Yes Windows Vinyl, low U,SHGC Vinyl, Low U, SHGC FURN AFUE 0.80 0.95 A/C SEER 13 (3.7 ton)14 w/TXV (3.1 ton) ACCA Design No Yes -- Short Runs Duct Testing NoYes Water Heater storage EF .60 Tankless EF .82 Distribution Standard Pipe insulation Home Energy RatingNo Yes Fluorescent LightingYes Yes (All fixtures) Solar ElectricNA2kW AC Solar System

  6. Solar vs Non Solar Avg Monthly Bills 2007 Premier and Treasure Homes Avg monthly electric bills are 58% less than Non- Solar Homes. $120.00 $100.00 Premier Homes NON ZEH AVG BILL Treasure Homes $80.00 $60.00 $40.00 $20.00 $0.00 Avg. Mo. Jan, 07 Feb, 07 March, 07 April, 07 May, 07 June, 07 July, 07 Aug, 07 Sept, 07 Oct, 07 Bill Real Bill Savings – Hitting the Target

  7. Where We’re Headed • CPUC and NAPEE goal of net-zero energy home by 2020 • Two projects to move toward true net-zero homes: • One Zero Energy Home (80% goal) • Project with PIER/SDG&E/SMUD to build ZEH subdivisions

  8. Current Energy Performance Goals (2500 ft2 floor area target) • Annual Source Energy: 80% Reduction • Zero Net Summer Peak Electric Demand: 4 PM to 8 PM • Demonstrate the features of the home to the public and builders

  9. Base Energy Performance Specs • 2x6/R19-R21 cavity/R12 insulating sheathing (R30 wall assembly) • R50 12” low-density foam ceiling assembly • Tight Envelope, .0002 SLA (4 ACH50), Third Party inspections & testing • Low e/low SHGC glazing (0.3 U-value, 0.26 SHGC) • 100% CFL/LED Lighting • Evaporative Condenser with 15 EER and night ventilation (home); SEER 18/12.5 EER and 10 HSPF mini-split heat pump (apartment) • Solar assisted hot water and hydronic heating with 97% efficient gas boiler • Tested ducts inside conditioned space • Gas clothes dryer and Energy Star dishwasher, clothes washer, and washing machine • 3.86 kW AC PV with grid connected battery system • Home automation system with energy display, communicating T-stat, lighting controls • LEED Platinum Estimated cost increase relative to standard home: +$20.00/ft2

  10. Peak Demand: 4kWac West Array T24 HOF

  11. PIER/SDGE&/SMUD Project • Scope of Work almost complete • Expect to build two subdivisions – one in San Diego and one in the Sacramento area • Homes will contain— • High efficiency windows, insulation, lighting, HVAC, water heating and appliances • Photovoltaic arrays • Demand response enabled • Energy storage (in some cases) • V2G and V2H test

  12. Our Hope • Results from these projects will: • be replicable • expand our knowledge • set the stage for the next level ZEH • have nationwide impact

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