solar thermal heating systems for south central alaska andy baker, p.e. independent clean energy...
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Solar Thermal Heating Systems for South Central Alaska
Andy Baker, P.E.
Independent Clean Energy Consultant
YourCleanEnergy LLC
Your Clean Energy
Finding affordable alternatives to fossil fuels is now one of the great challenges of our times
Viable energy projects must meet realistic criteria:
We seek out projects that will capture the imagination and interest of clean energy advocates in government, business
and the public; projects that can remain sustainable through the expected design life.
AFFORDABLE RELIABLE SAFE
Overview Introduction to Solar Thermal Heating
KTUU Film
YCE Solar Project: Seth Down’s Triplex
YCE Solar Project: Ionia Community
YCE Solar Project: Statewide Village Clinic
YCE Solar Project: Gakona Energy Center
Questions + Answers
oct
nov
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2005
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2006
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2007
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2008
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mar apr
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june july
2
2.5
3
3.5
4
4.5
5
2.14
2.65 2.72.82
3.04
3.62 3.63
3.81
4.04
2.4
2.55
2.82.75
2.4 2.45
2.69
3.23
$2.61
4.12
4.63
Propane & Heating Oil #1 Unit Price/Gallon - Oct 2004 - July 2008
Prices from Suburban Propane & Homerun Oil, Homer, Alaskaprepared 7/10/08 by Andy Baker, PE YourCleanEnergy LLC
Watt hrs/ sq meter
Solar Elevation Angle - Anchorage, Alaska
Solar Thermal Heating
SSolar Noon2pm
EW
N
11 am
8 am
5 am
2 am
11 pm
8 pm
5 pm
Anchorage’s Solar Compass
FLAT PLATE COLLECTORS WORK IN ANCHORAGE
EVACUATED TUBE (or heat pipe) COLLECTOR
The best performance for low sun & cold temps
Heat loss from tube is only from radiation (@2%)
KTUU Film
Seth Downs Triplex
October 26, 2008
P P
M
DomesticHot Water
City Water In
6 x Gobi 406 Solar Thermal Panels
Heat Exchanger
Storage Tanks3 x 80 Gal
Indirect HW Heater and Natural Gas
Boiler
50% Prop. Glycol
Seth Downs TriplexSolar Thermal System
P P
M
City Water In
Seth Downs TriplexSolar Thermal System
Datalogger
Webpage
DomesticHot Water
Seth Downs Triplex
Seth Downs Triplex
9:3
29:5
010:0
810:2
610:4
611:0
411:2
211:4
111:5
912:1
712:3
712:5
513:1
313:3
113:5
014:0
814:2
614:4
515:0
315:2
115:4
015:5
916:1
716:3
616:5
417:1
217:3
017:4
918:0
718:2
518:4
419:0
219:2
019:3
919:5
720:1
520:3
420:5
221:1
021:2
821:4
722:0
522:2
322:3
722:5
523:1
3
0.0
20.0
40.0
60.0
80.0
100.0
120.0
140.0
160.0March 20, 2009 - Seth Downs Triplex
Time (hr)
Tem
pera
ture
(F)
East +
West
Colle
ctors
Tank Top
Tank Botto
m
November 12, 2008
Seth Downs Triplex, Nov 12, 2008, 1pm
December 11, 2008
January 4, 2009
January 7, 2009
February 1, 2009
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
-$20,000
-$10,000
$0
$10,000
$20,000
$30,000
$40,000
$50,000Net Present Worth of Seth Downs Solar
Thermal System
Fuel Saved (PW)
Net Present Worth
Initial Invest-ment
Years
Initial Investment = $14,000
30% Tax Credit = $4,200
Net Initial Investment = $9,800
30yr Net Present Worth = $39,691
Internal Rate of Return = 4.8%
Years to Payback= 15 yrs
District Heating with Solar at Ionia Community,
Kasilof
Ionia CommunitySolar Thermal System
P P
DomesticHot Water
Cold Water In
6 x Gobi 410 Solar Thermal Panels
Heat Exchanger
Indirect HW Heater2 x 80 Gal
50% Prop. Glycol
GarnWood Boiler
2,000 Gal
STATE WIDE VILLAGE CLINIC- For Denali Commission- YCE in association with MCG Architects- Solar Thermal & PV – 75 deg tilt
GAKONA DETACHED ENERGY CENTER
- 20% of annual heat load met by solar thermal- 12 arrays of evacuated tube collectors + 4,000 gal storage- 80% of annual heat load met by wood boiler
GAKONA DETACHED ENERGY CENTER
INCENTIVES FOR SOLAR THERMAL SYSTEMS
FEDERAL TAX CREDIT
– RESIDENTIAL
30 % Tax Credit , no cap limit
Solar water heating property must be certified by SRCC or by comparable entity endorsed by the state in which the system is installed. At least half the energy used to
heat the dwelling's water must be from solar.
FEDERAL TAX CREDIT – COMMERCIAL
30% Investment Tax Credit – no limit
The credit is equal to 30% of expenditures, with no maximum credit. Eligible solar energy property includes equipment that uses solar energy to
generate electricity, to heat or cool (or provide hot water for use in) a structure, or to provide solar
process heat.
IRS FORM 3468
SOLAR HOT WATER - 30 YEAR LIFE CYCLE PAYBACK EVALUATION
Compared To CurrentFossil Fuel Payback
Propane: 9 years
Heating Oil: 10 years
Natural Gas: 15 years
Alaska Solar TourCome and Explore the Solar Projects in
your own backyard!
www.alaskasolartour.org
Saturday, May 8th
10am – 4pm
Visit website for details
Questions + AnswersCome and Explore the Solar Projects in
your own backyard!
www.alaskasolartour.org
Saturday, May 8th
10am – 4pm
Visit website for details
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