affordable energy efficient house
TRANSCRIPT
An Affordable Energy Efficient Home Utilizing Solar and Wind
Power and Solar Hot Water
John Gardner, PE
New HouseCompleted May 2004
Energy EfficientResidential Construction
Utilizing:
Energy Star Construction
Green Building Materials
Rainwater Collection
Solar Hot Water
Hybrid/Solar Wind System
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
Site Orientation
North
South
West
East
White Metal Roof
Radiant Barrier
HouseWrap
Skin Vent Wall Construction
Bottom Vent
Top Vent
3/4” air gap
Siding
Sealed Wall Penetrations
Double Pane WindowsLow- “E” Vinyl Frame
Minimum SHGCfor Energy Star= 0.4
14 SEER Air Conditioner
Green Building Materials
• Low VOC Paint• Engineered Beams• Fiber-cement Siding• Formaldehyde-free insulation• Cork Flooring• Minimal construction waste
Minimum Construction Waste
We used ½ of one of these containers
SolatubeSkylight
HomePerformance
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
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
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
Supplemental Heat
Vermont CastingsDutch West
Wood burning stoveWith Catalytic
Converter
Heat Powered Fan
Attic vs.OutsideTemperature
New House - White Metal RoofRadiant BarrierRidge VentContinuous Soffit Vents
Our New House
40
50
60
70
80
90
100
110
8:00AM
9:00AM
10:00AM
11:00AM
12:00AM
1:00PM
2:00PM
3:00PM
4:00PM
5:00PM
6:00PM
7:00PM
8:00PM
Time of Day
Tempe
ratu
re (D
eg. F
)
Outside
Attic
40
50
60
70
80
90
100
110
120
130
8:00 AM 9:00 AM 10:00 AM 11:00 AM 12 Noon 1:00 PM 3:30 PM 4:30 PM 6:30 PM 8:30 PM 10:30 PM
Time of Day
Tem
pera
ture
(Deg
. F
Attic Temperature
Outside Temperature
Previous House
New Construction
Old House - Dark Composition ShinglesSoffit VentsInadequate Ridge Vent
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
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!!!
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
$6.75/Watt installedBattery backup System
1 KW Bergey XL-1 Wind Turbine
1000 Watt PV Array
Solar/Wind Control Center
Solar Hot Water Collector
Solar Hot Water Circulator
Secondary TankWith Heat Exchanger
Sealed Downspouts Storage Tank
Rainwater Collection System
How much did all this cost?
• Base line house cost• Hybrid Solar & Wind• Rainwater collection• Solar Hot Water
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
How much did it cost?
This?
This?
This?
OrThis!
Solar EnergyAt Work
Everyone can do it!
The Future
Home, Sweet Home
Thank You!