Rising to New Standardsg
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California – Integrated California Integrated Energy Policy
N H Sh ll B N t Z E B• New Homes Shall Be Net‐Zero‐Energy By 2020 (inspired by the 2030 Challenge from Ed M i )Ed Mazria)
• HVAC Industry Shall Be “Revitalized”
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How Much Electricity Does A New California Home Use?Does A New California Home Use?
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How Much Natural Gas Does A New California Home Use?Does A New California Home Use?
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90
70
80
50
60
East
30
40
EastWestNorth
20
30
0
10
1 t Qt 2 d Qt 3 d Qt 4th Qt1st Qtr 2nd Qtr 3rd Qtr 4th Qtr
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Fan Energy and System Sizinggy y gSurvey Results
Survey low Survey High % difference
Fan: watts/square foot 0.13 W/SF 0.92 W/SF 708%
Heating: Btu/square foot 9 Btu/SF 110 Btu/SF 1,222%
Cooling: square feet/ton 1,739 SF/ton 200 SF/ton 869%
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Building Performance Test Equipment is Driving Industry Changesis Driving Industry Changes
• Test equipment started to become available in q p1985.
• Now (over 2 decades later) we have the ability to evaluate the true installed performance of all residential energy featuresresidential energy features.
• As we evaluate each energy feature - large• As we evaluate each energy feature - large opportunities for improvement are found in every category.
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Opportunity ForEnergy Savings
• It’s Common To Average 50% To 80% Energy Savings on Both New and Retrofit ProjectsSavings on Both New and Retrofit Projects.
• When Done Correctly; Comfort, IAQ, Durability and Health & Safety Issues Are Also Taken Into Account With the Savings
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Redding CaliforniaRedding, CaliforniaShowcase Home – Case Study
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Redding, CaliforniagShowcase Home
Bill guaranteed at $76.00 per year for airfor air conditioning, $241.00 per year$241.00 per year for heating, $317.00 per year total, $0.09/sq.ft.-year, 3,500 sq are foot home
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square foot home
Redding California Showcase HomeRedding, California Showcase HomePerformance Monitored By
DOE Building America ProgramDOE Building America Program
Hi h d h (R l ’ Sh f• High‐end custom home (Realtor’s Showcase of Homes)
• Conventional architecture• Conventional architecture• Conventional framing• Conventional insulation (batts in walls loosefillConventional insulation (batts in walls, loosefill
in attic) • Conventional HVAC system (ducts in the attic)
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Redding, California Showcase HomePerformance Monitored By
DOE Building America Programg g
• Actual cooling costs reduced 81% (83% compressor, 68% fan, report page 10)
• Actual heating costs 49% reduction in gas g gusage, 65% fan energy reduction (report page 10) )
• Cost of energy improvements were 0.4% of home cost or $5 139 00 (see report page 11)
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home cost, or $5,139.00 (see report page 11)
Redding, California Showcase HomePerformance Monitored By
DOE Building America Programg g
• Air conditioner size 2 tons (1,760 square feet f i l)per ton, one quarter of typical)
• 60% better performance than the geothermal h dheat pump next door
• Building America’s computer model DOE‐2 was bl l di h h i dnot able to accurately predict the heating and
cooling savings – under predicting actual savings by 43% and 46% respectively
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savings by 43% and 46% respectively
Sacramento, CaliforniaSacramento, CaliforniaSMUD Advantage Home
Case StudyCase Study
• Home built in 1998, retrofitted in 2007
• Utility Program Standards 30% better than T‐24Utility Program Standards, 30% better than T 24
• Already had high performance windows (low‐e2)
• 2800 square foot, slab on grade, two stories
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Natural Gas SavingsNatural Gas Savings
120
140
160Total therm savings: 42%
Heating therm savings: 49%
80
100
120
erm
s
Before
40
60
80
The After
0
20
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ber
Octobe
rNov
embe
rDec
embe
rJa
nuary
Februa
ry
March
April
June Ju
lyAug
ust
Electric Savings
1 800
Electric Savings
1,400
1,600
1,800Total kWh savings since retrofit: 59%*
Air Conditioning kWh savings: 72%*
*Despite 10 20% energy penalty of pre cooling testing in
1,000
1,200
kWh
Before(4 yr avg)Aft
Despite 10-20% energy penalty of pre-cooling testing in summer of 2007—future savings will be greater.
400
600
800k After
-
200
r r r r y y h l e y t
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ber
Octobe
rNove
mber
Decembe
rJa
nuary
Februa
ryMarc
h
April
May
June July
Augus
t
Average Monthly Energy Costs: $98
Total Bill Savings:
52%
$1,260/year$ , /y(despite rate increases)
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SOLARA
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Homes constructed today have a cost‐Homes constructed today have a costeffective opportunity for energy‐efficiency improvement of abo tefficiency improvement of about:
a) 0% ‐ 20%a) 0% 20%
b) 20% ‐ 40%
c) 40% ‐ 60%
d) 60% ‐ 80%
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Over the last 10 years the overall ythermal performance of new residential envelopes has increasedresidential envelopes has increased how much?
a) 0%
b) 15%b) 15%
c) 30%)
d) 60%
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Retrofitting a conventional storage g gtype natural gas water heater with a tankless natural gas water heater hastankless natural gas water heater has a simple payback of?
a) 10 weeksa) 10 weeksb) 10 monthsc) 1 yeard) 3 yearse) 10 yearsf) 100 years) y
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