HEADING TO NETZERO BY 2020

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HEADING TO NET-ZERO BY 2020

• Jim Parks
• EECRD Manager
• Energy Efficiency and Customer Research and
  Development

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

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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
• Specd and Optional Upgrade
• gt30 Title-24, 2 kW ac Solar

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A Step Up

• PV in all homes EE
• Premier Homes Premier Gardens 2004-05
• 95 units
• Entry level, in-fill project
• gt30 Title-24, 2 kW PV
• Standard Feature
• Treasure Homes 2006-07
• 32 units
• Entry level, in-fill project
• gt40 Title-24, 2 kW PV
• Standard Feature

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Features
40 Better Than 2005 Title-24 Standards Measure
Base ZEH Attic Insulation R-38 R-38 Radian
t Barrier No Yes Wall Insulation R-13 R-13
1 R-4.2 Foam Quality Installation No Yes 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 No Yes Water Heater storage
EF .60 Tankless EF .82 Distribution Standard Pi
pe insulation Home Energy Rating No Yes Fluoresce
nt Lighting Yes Yes (All fixtures) Solar
Electric NA 2kW AC Solar System
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Real Bill Savings Hitting the Target
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Where Were 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/SDGE/SMUD to build ZEH
  subdivisions

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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

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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
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Peak Demand 4kWac West Array
T24
HOF
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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

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Our Hope

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