smud energy efficient remodel demonstration...
TRANSCRIPT
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SMUD ENERGYEFFICIENT REMODEL
DEMONSTRATION PROGRAMPresentation to CABEC Conference
May 6, 2010San Luis Obispo, California
Mike KeeseeProject Manager
Energy Efficiency CustomerResearch & Development
SMUD
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Outline
• SolarSmart Homes• Home of the Future• Deep Energy Retrofits• Efficiency Packages• Lessons Learned• Recommendations
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EFFICIENCY FIRSTTHEN SOLAR
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What is a New Home?23-42% improvement to 2005 Title 24 plus solar~ 60% Electricity Savings/ 30% Gas SavingsMeasure Base SolarSmart New HomesAttic Insulation R-38 R-38Radiant Barrier No YesWall Insulation R-13 R-13 + 1” R-4.2 FoamQuality Installation* No YesLow Air Infiltration* No YesWindows Energy Star Energy StarFURN AFUE 0.80 0.90+A/C SEER 13 (3.7 ton) 14 SEER/12 EER (3.1 ton)ACCA Design* No YesDuct Testing* No YesFluorescent Lighting T-24 YesSolar PV NA 2kW AC Solar System
*HERS verified upgrades
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SMUD & Other Incentives• SMUD (as of 04-30-10)
– $2.20/watt (2000 watt CEC AC rated) $4,400– Efficiency rebate $1,100– Customized Contract (per unit incentive) $5,500
• Federal Tax Credits– Builder Tax Credit (if extended) $2,000– Home-owner PV Tax credit $2,000
• Other Incentives– IOU Advanced Home Program
• Total Incentives ~$7,750 - $9750
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Market momentum - 46 Communities,over 4,000 new homes over next 4years
• Lennar• Sunrise Lofts LLC• Tim Lewis Communities• Regis• 49 Mile Development• Standard Pacific Homes• Woodside Homes
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Home of the Future
• 80% Reduction AnnualSource Energy
• Zero Net SummerPeak Electric Demand:4 PM - 8 PM
• Demonstrate thefeatures of the home tothe public and builders
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54-60% better than 2005 Title-24LEED Platinum Home
• Attic R38 ceiling assembly (low density foam)• Wall 2x6/R19-R21 cavity/R12 insulating sheathing -R30• Envelope .0002 SLA (4 ACH50)• Windows 0.29 U-value, 0.27 SHGC• Ducts Tight ducts, inside conditioned space• FURN Solar Assisted Hydronic space heating• A/C Aqua Chill Water Cooled AC (Home)• Ductless, HE, Mini-split Heat Pump (Casita )• Water Solar with HE boiler hot water backup• Lighting 100% CFL and LED Lighting• Solar 3.8 kW AC Solar Electric PV• Gas and/or Energy Star Appliances• Home Automation• Grid Tied Battery Back Up/Utility Dispatch
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HOF Costs
• ~$48,000 Incremental Costs:• Big Hit: Solar
– PV ~$30,000– Solar Thermal ~$8,000 (including heating)
• 2 Buildings (House & Apt)• Didn’t count the Green Stuff• “Emerging” Technologies
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HOF Estimated Results
• Met Source Reduction Goal – 89%• HERS 16• Zero Electric Home But Not Zero Energy!
– Net Annual Exporter of Electricity• ~ 2,000 kWh/year
– 50% reduction in gas usage• Impressive Bill Savings
$24/month vs. $140/month
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Results to Date
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Results to Date
Avg . Monthly Gas Use 8 therms vs estimated 30 therms75% less than estimated
PV Provides 60 % kWh
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Deep Energy Retrofit -What is it?
Retrofit/Upgrade home toreduce total household
annual source(electric/gas) energy use
50%
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Typical Residential EnergyEfficiency Measures
• R-40 Attic Insulation with Radiant Barrier• R-19+ Walls• Air Sealing, Tight Envelope, 3ACH50• SEER 16+ AC• AFUE 90% furnace w/ variable speed van• Tight, tested R-6 ducts• Hi-Efficiency Water Heater• Energy Star CFL fixtures and Appliances
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R&D
• New Wall Insulation Methods• Home Automation• Advanced Solar PV & Thermal• Heat Pump Water Heaters (all electric)• Air Sealing Techniques
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GreenBuilt Construction8901 Quail Hill Way, Fair Oaks
Market Rate Flip• 62% Source Energy Savings• $42k• 182 to 78 HERS score• R-40 Attic Insulation with
Radiant Barrier• High Efficiency Windows• Air Sealing, 4.1 ACH50• SEER 16/ HSPF 9.0 Heat
Pump w/ tight, tested R-6ducts
• Heat Pump Water Heater w/Solar Pre-Heat
• Energy Star CFL fixtures andAppliances
• Solar Electric PV
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GreenBuilt Energy Savings
2 7 5 5 2 5 6 9
2 4 6 8 2 1 6 6
2 8 0 5
7 8 5
5 6 1
2 6 7
4 6 2
5 6
4 0 9 6
8 1 3
9 4 3 1
5 1 5 3
3 3 6 3
1 0 7 2
-5 0 0 0
0
5 0 0 0
1 0 0 0 0
1 5 0 0 0
2 0 0 0 0
2 5 0 0 0
3 0 0 0 0
Sit
e E
lec
tr
ic C
on
su
mp
tio
n
(kW
h/
yr
)
P V
H o t W a te r
H e a tin g
C o o lin g
C o o l F a n
H e a t F a n
L ig h ts
L g . A p p l.
M is c .
- 2 9 0 1
E E RR e f
T o ta l = 2 5 4 9 1 k W h
T o ta l = 9 9 8 0 k W h
15,511/yr61% Savings
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GreenBuilt SEERAvg. Monthly Energy Bill Savings
$261
$82$0
$50
$100
$150
$200
$250
$300
Basecase Avg Monthly Electri Bill Bayless SEER Annual Utility Bill
69% Savings$179/mon
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Housing Group Fund5832 Mascot Ave., Sacramento
Rehabbed AbandonedHome/ Affordable Housing
• 53% Source EnergySavings
• 241 to 86 HERS Score• R-40 Attic Insulation with
Radiant Barrier• High Efficiency Windows• Air Sealing, 6ACH50• SEER 16/ 80% AFUE• Tight, Tested R-6 ducts• Condensing Tankless• Energy Star CFL fixtures
and Appliances
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Mascot DER Estimated AnnualElectricity Savings
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Mascot DER Estimated AnnualGas Savings
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Mascot DER Estimated AnnualEnergy Bill Savings
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Del Paso Solutions1110 Jean Ave., Sacramento
Rehabbed AbandonedHome/ Affordable HousingAll Electric
• 57% Source EnergySavings
• R-40 Attic Insulation• High Efficiency Windows• Air Sealing, Tight
Envelope, 3ACH50• SEER 15/8.8 HSPF Mini-
Split Heat Pump• Heat Pump Water Heater• Energy Star CFL fixtures
and Appliances
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Jean DER Estimated Energy Savings
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Jean DER Estimated AnnualEnergy Bill Savings
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Home PerformanceApproaches
• Performance – available now– Comprehensive ‘whole-house,’ assessment,– Test-in and test-out– Shell measures + system upgrades– TBD ~ $3,500 customer incentive
• Prescriptive – under development– Shell measures– TBD ~ $1,000 customer incentive
• Both approaches are in coordination with IOU, PACE,and potentially Home Star programs
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The Basics – 30% Savings• Perform Home Energy Rating (HER)• Air seal the house to 8 ACH 50• Insulate the attic to R-38• Seal and tighten heating and air
conditioning ducts to ≤6% leakage• Insulate the water heater• Reduce hot water demand – install water-
saving faucets and showerheads• Install an ENERGY STAR® programmable,
set-back thermostat
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The Basics – 30% Savings• Control the sun – Install interior blinds,
exterior shade screens or awnings, or lowemissivity (low-e) films on east and westfacing windows. Install retractable awnings onsouth-facing windows
• Replace incandescent lighting with ENERGYSTAR® CFL lighting
• Plug electronic and entertainment equipmentinto power strips
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Re-Roof- 30%+ Savings
• Basics +• Radiant Barrier or Cool Roof
• Basics +• .62 EF Water Heater or 2.0 COP Heat Pump
Water Heater• Energy Star Windows• Energy Star Exhaust Fan• CFL/LED Hard Wire Fixtures
Bathroom – 30-40% Savings
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Kitchen– 30-40% Savings• Basics +• Energy Star Windows• Energy Star Appliances• Energy Star Range Hood• CFL/LED Hard Wire Fixtures
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HVAC Replacement – 30-40%Savings
• Basics +• ACCA Manual's J, S, and D mechanical
system design• SEER 14.5 / EER 12 AC• .92 AFUE Furnace or 8.0 HSPF Heat Pump• Sealed R-6 ducts sealed tested to be less
than 6% leakage or better.
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Gut Rehab/Additions 50-60% Savings
• Basics +• Energy Star Windows• HVAC Replacement• Water Heater Replacement• CFL Hard Wire Fixtures
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Pre 80s – 50- 60% Savings Package• HERS Testing/Inspections• Air Seal to ~8 ACH50 (0.35 ACH n)• R-38 Attic Insulation (Radian Barrier w/
Reroof)• SEER 14.5 AC/92 AFUE Furnace w/ Tight
Ducts (< 6% leakage)• Energy Star + Windows• .62 EF Gas Water Heater or HPWH• Energy Star Hard Wired CFL Fixtures
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Lessons Learned – Home Buyers• Significant utility bill savings – It’s
Affordable• Solar/Efficiency has little appeal as an
option but immense appeal as a standardfeature
• Energy savings need to be sold on cashflow not payback
• New home buyers are unfamiliar with thebenefits of owning their own PV system
• Solar and efficiency have not hit “criticalmass,” with buyers, but momentum isbuilding –SolarSmart 30% of Market
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Lessons Learned - Builders• Clear builder preference for building-
integrated PV systems over roof mountedPV systems
• Builders want to use their ownsubcontractors and/or have turn keysolutions
• Partner with and reward Market Leaders• Train Them
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Lessons Learned - Others
• UTILITIES– Significant peak demand reduction.– Potential Distribution System savings
(yet to be proven)
• Engage and train Local Government• Energy simulation ain’t real
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What does Cost Mean?
• Home sold close to asking price in worstmarket ever in 3 months.
• One offs are expensive.• What are you selling?
Quality vs. Quantity• SF Costs
– 2400 SF vs 2300? What’s the difference?– Quality
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Challenges to Achieving ResidentialZero Energy
• Offsetting Gas Usage– 28,962,234 Btus = 8,476 kWh or ~ 5 kW +
• Peak Demand Issues– Cooking– Water Heating– Clothes Drier
• Dumb Grid/Dumb Appliances/Dumb House
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Challenges to AchievingRes Zero Energy/Peak
• No Price Signals• Bad Market• Growing Plug Loads• Uninformed buyers/users• Need for Collaboration and
Coordination Among Utilities
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Achieving Residential Zero Energy
An All Electric House!?!• Solar w/ Heat Pump Water Heaters• Electric Clothes Drier (w/ controls)• Japanese Homes• Review/Revise T-24 Assumptions
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What’s Green?
80% Energy20% Everything Else
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Recommendations
• Partner w/ the Building America Program• Work w/ local utilities• Get Trained• Green Building Programs must emphasize
energy savings!• Efficiency First, Then Solar
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Summary
• New – 80% in reach• Retrofits - 50% + Energy Savings• DER Packages• Partner w/ local Utility(ies)• Watch out for Plug Loads