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Autonomous Solar Strategies Sept. 13, 2004 http://www.uvm.edu/~gflomenh/CDAE170/. Gary Flomenhoft , BSME, MPP, CEE Research Associate, Gund Institute, SNR. Why Solar?. World Oil Extraction. Peak Gas and Oil. The Epoch of Fossil Fuel Exploitation (after Hubbert, 1969). 300. 200.
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Autonomous Solar Strategies Sept. 13, 2004 http://www.uvm.edu/~gflomenh/CDAE170/ Gary Flomenhoft, BSME, MPP, CEE Research Associate, Gund Institute, SNR
The Epoch of Fossil Fuel Exploitation (after Hubbert, 1969) 300 200 Trillion kwh per year 100 +5 +1 +2 +3 -1 +4 -5 -4 -3 0 -2 Mayan Steam culture Stonehenge Built Parthenon Engine completed Pyramids Iron in constructed Black Middle Death East Inquisition Magellan's Circumnavigation
Prices = Economic Scarcity What is the scarce resource?
Scarce resource but no price 150 years for feedback
John’s House Rough Lumber from Local Mill Spruce Siding from Local Mill Roof Slate Recycled from Old Barn House is Super Insulated (R 30 walls dense-pack cellulose) Casement Windows are R 6 Heat w/ Wood, 1 cord/winter Back-up radiant heat 1400 square feet + basement Greenhouse is mostly recycled Double Pane Glass in Greenhouse Greenhouse Wood is Salvaged old-growth Cypress NO PLYWOOD!
Passive Solar Building Strategies Choose a good site. Orient east-west and 10deg to TRUE south Locate most windows on south side 7-12% of ft2. Minimize windows on N,W,E sides Provide overhangs or shading to regulate solar gain Thermal storage mass Insulate walls, ceilings, floors, foundations, & windows Protect insulation from moisture Seal house against air infiltration; provide air exchange Provide direct solar heat to each room Create sun free spaces Provide properly sized eco-friendly back-up Protect from wind by landscape or earth berm Synchronize design with living patterns
1. Choose a good site BURLINGTON, VT DATA
Declination (variation) 2. Orient within 10deg to TRUE south
Indirect Gain: Trombe Wall: vented (Thermal storage or Trombe wall) Vented Trombe wall
Garden Room Ted Montgomery’s Green Home
Review of Indirect Gain Principles-Chiras Orient south +-10 degrees High performance glass Thermally isolate glass High quality caulk Use Selective surface or high temp paint Use dense material Minimal interior finish Insulate glass at night Direct + Indirect glazing = MAX 20% of floor area
3. Locate most windows on south side South glass: 7-12% of floor footage SQUARE FOOTAGE = HEATED FLOOR AREA EXAMPLE: 12% OF 3000 SQ FT = 360 SQ FT 4. Minimize windows on N,W,E sides North glass: <=4% East glass: <=4% West glass: <=2% Use low-e multiple panes
Windows-Yestermorrow Windows Facing South Ventilation throughout building Triple pane glass