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DESIGNING PASSIVE SOLAR HOMES Why We Need Energy Efficient Home Design. World Energy Consumption Forecast 54% increase in next 20 years (Energy Information Agency, 2004). World Primary Energy Sources Source: Energy Information Agency, U.S. Department of Energy 2002.
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DESIGNING PASSIVE SOLAR HOMESWhy We NeedEnergy Efficient Home Design
World Energy Consumption Forecast54% increase in next 20 years (Energy Information Agency, 2004)
World Primary Energy Sources Source: Energy Information Agency, U.S. Department of Energy 2002 Geothermal, solar wind, waste 0.8% Hydro 6.6% 25 quads Nuclear 6.6% 25 quads Petroleum 37.9% 153 quads Natural Gas 23.5% 95 quads Fossil Fuels: 85% of Primary Energy Coal 24.1% 153 quads
World Carbon Dioxide Emissions(Source: Energy Information Agency, 2004)
(pictured to the left) Source: “Defusing the Global Warming Time Bomb”,James HansenScientific American, Vol. 290, No. 3, (March, 2004), p. 69 (Pictured above)Source: Nature’s Voice, Natural Resources Defense Council (Jan/Feb, 2004)
Source: National Geographic, “In Hot Water”, August, 2005, p. 72
Source: TIME, Special Report. “An American Tragedy”, September 12, 2005
Oil and gas topping point Summary: ASPO view Oil topping point Source: ASPO
Natural Gas: Volatile PricesPrice projected to increase another 40% by 2020Source: American Gas Assn
THE SUN Abundant Reliable Inexhaustible Distributed De-Centralized Green
SOLAR ENERGY • Heating Buildings • Heating Water • Producing Electricity from light
Principles of Solar Home Design • Winter: Sun In: Orientation and Angle. • Summer: Keep Sun out: Use of Eaves, shade zones, and color. • Storage: Thermal Mass: Store warmth in the winter; store “cool” in summer; keeps temperature even • Weatherization: Keep warmth in in the winter and out in the summer. • Air Circulation: For Cooling and Warming
#1: Let Sun In: A. Orientation; Seasonal Sun Angles Summer: 74 Winter:30
#1: Let Sun In: Direct Gain:Glass: the magic solar heating technology Winter Sun Angle30degs.
#2: Strategic Use of Eaves: Using Seasonalangles to our advantage “Designing with Nature”. Two foot eaves work well.
#2: Eaves to Keep Summer Sun Out: Let Winter Sun In Summer Sun Angle Winter Sun Angle
Angles slats let winter sun in Angled Slats in Shade Structure
#3: Storage: Store Energy Gained Thermal Mass: (Conduction and Convection)
#3: Direct Gain with Thermal Mass Thermal Mass Thermal Mass
#4: Keep Sun In: Insulation:Keeps heat in in the winter and heat out in the summer
Tried and True--these methods have been around for some time.
Insulation: Straw Bale: 2 feet thick: Holds in heat in winter and keeps it out in Summer: R-value approx. 30
Rammed Earth The use of Thermal Mass
Rather normal looking for a “solar home;” note water heater in addition to home heating.
Ancient Design: Passive Solar has been around for a long time
High School Wind Generator Solar PV Electricity Adequate Overhangs? Southern Glass