Bio36_16_Renewable - 1 2 1 2 3 1 2 4 1 2 5 Overview Ch. 16:...

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1 Overview • Ch. 16: Renewable Energy – Putting Solar Energy to Work – Indirect Solar Energy •Hydropower •Wind power •Biomass energy – Renewable Energy for Transportation – Additional Renewable-Energy Options •Geothermal energy – Policies for a Sustainable-Energy Future Solar Energy • Radiant energy from Sun – Solar constant: 1,366 watts/m 2 •50% to Earth’s surface: ~ 700 watts/m 2 – Ultimately converted to heat – Enormous amount of energy • Hurdles to overcome – Collection – Conversion – Storage • Photosynthesis – Collects solar energy with leaves – Converts to chemical energy with in chloroplasts Solar Heating: Water • Flat-plate solar collectors – Water circulates in tubes heated by sun • Solar water heaters – Active system •Heated water moved by pumps – Passive system •Natural convection currents •Collector is lower than the tank Solar Heating: Air • Air circulates through collector box – Flat-plate collectors – Homemade devices •Passive: convection circulates heated air • Energy Star program – Energy conservation •Use 40% less energy •Tax deductions • Solar space heating – Building designed as collector •Well-insulated building is the best storage •Landscaping can contribute to efficiency – Earth-sheltered housing •Earth berms against walls •Cover with earth, southfacing windows •Dehumidifiers for moisture problems Solar Production of Electricity 1 2 1 2 3 1 2 4 1 2 5
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2 • Photovoltaic (PV) cells – 4 in. 2 for 1 watt power • How they work – Light dislodges electrons creating electrical current – 15 – 30% efficient • Uses – Calculators, satellites – Net metering •Connected to power grid • Cost – $0.25/kilowatt hour •Grid: $0.12/kWh in CA – Fastest growing technology industry • Inverters – Direct current (DC) b alternating current (AC) Solar Production of Electricity • Photovoltaic (PV) cells – Utilities •Large-scale installations – New PV technologies •Thin-film PV cells with amorphous Si or CdTe •Thinly sliced Si crystals •Glass coated with dyes that transmit energy to solar cells on the edge
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This note was uploaded on 01/12/2012 for the course BIOLOGY 36 taught by Professor Teresafinnern during the Fall '11 term at Riverside Community College.

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Bio36_16_Renewable - 1 2 1 2 3 1 2 4 1 2 5 Overview Ch. 16:...

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