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Energy Sustainability Renewable Energy Chapter 13
Use LESS Energy • LIST ANY FIVE PRACTICES YOU CAN DO TO USE LESS ENERGY.
Large-scale Measures to Use LESS Energy Governmental “top-down” approach • Fuel standards • public transportation • taxation to discourage use coal, oil, natural gas • rebates/tax credits • tiered rate
Energy Efficiency • Obtaining the same amount of work from a smaller amount of energy. • CF bulbs = ¼ incandescent • LED bulbs = 1/6th incandescent • Energy Star appliances
Air Conditioner Shopping • Energy efficiency can save you a lot of money If the air conditioner runs 12 hours a day for six months, how long does it take to recover the $100 extra cost?
Air Conditioner Shopping • Energy efficiency and conservation can save you a lot of money When will the Energy Star unit completely pay for itself?
PEAK DEMAND • If power generators can not meet it then there are blackouts or brown outs. • To prevent this they build excess generating capacity • reduce peak demand with a varying price structure
Electricity Generating Plants Are 30% Efficient • 2nd Law of Thermodynamics • Energy conservation savings = energy not used PLUS the energy that would have been lost in creating the electricity itself • Ex: if you do not use 100kWh of electricity, what are we actually conserving? • A: 100 + 200 = 300kWh
Energy Efficiency and Conservation • Least expensive • Most environmentally sound to maximize energy resources • Easiest to implement because simple changes to existing systems
Unheated Buildings • Passive solar energy • Certain design features can enhance passive solar energy’s heating potential • South facing windows (in N. hemisphere) • Well insulated buildings • Double-paned windows • Attic vents • Overhangs and solar sunspaces
Thermal Inertia • Concrete & stone • Question: is it hotter in the city or the summer?
Green Roofs • Reduce the need to heat/cool • Cool & shade the buildings in summer • Improved air quality • Reduced runoff • Groundwater recharge
California Academy of Sciences • Passive solar • Radiant heating • Solar panels • Skylights • Louvers/windows • Recycled denim • Green roof