an affordable energy efficient home utilizing solar and wind power and solar hot water john gardner,...
TRANSCRIPT
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An Affordable Energy Efficient Home Utilizing Solar and Wind
Power and Solar Hot Water
John Gardner, PE
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New HouseCompleted May 2004
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Energy EfficientResidential Construction
Utilizing:
Energy Star Construction
Green Building Materials
Rainwater Collection
Solar Hot Water
Hybrid/Solar Wind System
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Energy Star Construction
• House oriented North/South• South & West walls shaded• Skin Vent wall construction• Continuous soffit & ridge vents• 14 SEER A/C• Rigid A/C ducts w/R-8 insulation• Fresh air intake• R-30 attic, R-19 wall insulation• Radiant barrier roof deck• White metal roof• Double pane, Low “E”, vinyl frame windows• Energy Star Appliances
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Site Orientation
North
South
West
East
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White Metal Roof
Radiant Barrier
HouseWrap
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Skin Vent Wall Construction
Bottom Vent
Top Vent
3/4” air gap
Siding
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Sealed Wall Penetrations
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Double Pane WindowsLow- “E” Vinyl Frame
Minimum SHGC for Energy Star= 0.4
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14 SEER Air Conditioner
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Green Building Materials
• Low VOC Paint
• Engineered Beams
• Fiber-cement Siding
• Formaldehyde-free insulation
• Cork Flooring
• Minimal construction waste
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Minimum Construction Waste
We used ½ of one of these containers
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Solatube Skylight
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HomePerformance
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Summary
• Ventilated attic
• Attic temperatures are reduced
• Temperature and humidity levels in the attic are dynamic
• Energy costs are reduced
• Results achieved with standard materials and common building practice
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KWH Usage per Month
0
500
1000
1500
2000
2500
Jan. Feb. Mar. April May June July Aug. Sept. Oct. Nov. Dec.
Month
KW
H
Typical House in our Area
Our Old House
Our New House
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Energy Savings
• 60% less electricity compared to a typical house in our area because of energy efficient construction and Solar/Wind power.
• 40% less gas compared to previous year after adding Solar Hot Water Heater & supplemental heat
• Reduced Carbon Footprint
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Supplemental Heat
Vermont CastingsDutch West
Wood burning stoveWith Catalytic
Converter
Heat Powered Fan
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Attic vs.Outside Temperature
New House - White Metal Roof Radiant Barrier Ridge Vent Continuous Soffit Vents
Our New House
Outside
Attic
New Construction
Old House - Dark Composition Shingles Soffit Vents Inadequate Ridge Vent
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Recommendations
• Site orientation is very important– Shading– Prevailing winds
• Utilize Energy Star® recommendations– Reduced energy/water requirements– Reduces heat load in the house
• Keep the heat out of the house– Reflective roof– Porches– Light exterior paint color
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Recommendations
• Adjust the air conditioner properly– Run long enough to remove humidity– Utilize good sealed air ducts
• Reduce indoor heat load– Compact fluorescent lamps– Efficient appliances
• Maintain good air quality– Non toxic building materials– Fresh air intake
• Educate your builder!!!
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Icing on the Cake
• Hybrid Solar/wind system– Generate 190 KWH/month
• Solar hot water heater– Preheat well water to 90-100 deg. F
• Rainwater collection system– Collect 1400 gallons in a 1” rainfall
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$6.75/Watt installedBattery backup System
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1 KW Bergey XL-1 Wind Turbine
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1000 Watt PV Array
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Solar/Wind Control Center
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Solar Hot Water Collector
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Solar Hot Water Circulator
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Secondary TankWith Heat Exchanger
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Sealed Downspouts Storage Tank
Rainwater Collection System
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How much did all this cost?
• Base line house cost
• Hybrid Solar & Wind
• Rainwater collection
• Solar Hot Water
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Added Cost/ft2 to the House2100 Square feet
• Solar/Wind - $6.43
• Solar Hot Water - $0.88
• Rainwater Harvesting - $0.87
• Total - $8.18/ft2
Cost to build the house - $64.00/ft2
$8.18/ft2
$72.18/ft2
Ave. sales price in our area:$86.90/ft2
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How much did it cost?
This?
This?
This?
OrThis!
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Solar EnergyAt Work
Everyone can do it!
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The Future
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Home, Sweet Home
Thank You!