Download - Renewable Energy Chapter 18
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Renewable EnergyRenewable Energy Chapter 18Chapter 18
Advanced Placement Environmental Science
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Energy EfficiencyEnergy EfficiencySolar EnergyHydropowerWind PowerBiomassGeothermalSustainability
www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
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Energy EfficiencyEnergy EfficiencyIncreasing energy efficiency of
common devices has economic and environmental advantagesReducing oil importsProlonging fossil fuel suppliesReducing pollution and environmental
degradationSaving moneyBuys time to develop new technologyCreating jobs
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Efficiency of Some Common DevicesEfficiency of Some Common DevicesDevice Efficiency (%)Device Efficiency (%)
Dry-cell flashlight battery 90 Home gas furnace 85 Storage battery 70 Home oil furnace 65 Small electric motor 62 Steam power plant 38 Diesel engine 38 High-intensity lamp 32 Automobile engine 25 Fluorescent lamp 22 Incandescent lamp 4
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Energy Energy EfficiencyEfficiencypercentage of energy input that does useful work in an energy conversion system
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Ways to Improve Ways to Improve Energy EfficiencyEnergy Efficiency
Between 1985 and 2001, the average fuel efficiency for new motor vehicles sold in the United States leveled off or declinedFuel-efficient models account for only a tiny
fraction of car salesHybrid-electric cars are now available and
sales are expected to increaseFuel-cell cars that burn hydrogen fuel will be
available within a few yearsElectric scooters and electric bicycles are
short-range transportation alternatives
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Energy use of various types of transportation
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Ways to Ways to Improve Improve Energy Energy
EfficiencyEfficiency Superinsulated house is more expensive than a conventional house, but energy savings pay back the extra cost
Strawbale houses have the additional advantage of using an annually renewable agricultural residue, thus slowing deforestation
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Ways to Improve Ways to Improve Energy EfficiencyEnergy Efficiency
Existing homes can be made more energy efficient adding insulationplugging leaksinstalling energy-saving windowswrapping water heaters installing tankless models buying energy-efficient appliances and
lights
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Energy EfficiencySolar EnergySolar EnergyHydropowerWind PowerBiomassGeothermalSustainability
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Solar Energy Solar Energy Buildings can be heated
passive solar heating system active solar heating system
Solar thermal systems are new technologies that collect and transform solar energy into heat that can be used directly or converted to electricity
Photovoltaic cells convert solar energy directly into electricity
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Suitability of Solar UsageSuitability of Solar Usagebest when more than 60% of daylight hours sunny
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Solar HeatingSolar HeatingPassive system:Absorbs & stores heat from the sun directly within a structure
Active system:Collectors absorb solar energy, a pump supplies part of abuildings heating or water heating needs.
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www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
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Solar Domestic Hot Solar Domestic Hot Water (SDHW)Water (SDHW)
An open circuit hot water system heats the domestic water directly on the roof of the building
The water flows from the heat collector into the hot water tank to be used in the house
Integration of solar energy conservation in homes can reduce energy consumption by 75-90%.
www.iea-shc.orgwww.earlham.edu/~parkero/Seminar/ SOLAR%20AMERICA%5B1%5D.ppt
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Photovoltaic (Solar) CellsPhotovoltaic (Solar) CellsProvides electricity for buildings
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Inside the PV cellInside the PV cellPV cells are made
from silicon alloys PV module
1cm by 10cm cells
36 cells connected
www.earlham.edu/~parkero/Seminar/ SOLAR%20AMERICA%5B1%5D.ppt
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www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
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Solar Thermal TechniquesSolar Thermal TechniquesSolar Two
www.earlham.edu/~parkero/Seminar/ SOLAR%20AMERICA%5B1%5D.ppt
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HeliostatsHeliostats
Heliostats provide concentrated sunlight to the power tower
The reflecting mirrors follow the sun along its daily trajectory
www.earlham.edu/~parkero/Seminar/ SOLAR%20AMERICA%5B1%5D.ppt
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Power TowerPower Tower Sunlight from mirrors
are reflected to fixed receiver in power tower
Fluid transfers the absorbed solar heat into the power block
Used to heat a steam generator
Solar One
www.earlham.edu/~parkero/Seminar/ SOLAR%20AMERICA%5B1%5D.ppt
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www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
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Solar-Hydrogen Solar-Hydrogen RevolutionRevolution
Splitting water can produce H2 gasIf scientists and engineers can
learn how to use forms of solar energy to decompose water cheaply, they will set in motion a solar-hydrogen revolution
Hydrogen-powered fuel cells could power vehicles and appliances
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www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
Energy EfficiencySolar EnergyHydropowerHydropowerWind PowerBiomassGeothermalSustainability
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History of Hydroelectric History of Hydroelectric B.C. - Used by the Greeks to turn water wheels for
grinding wheat into flour, more than 2,000 years ago
1775 - U.S. Army Corps of Engineers founded, with establishment of Chief Engineer for the Continental Army
1880 - Michigan's Grand Rapids Electric Light and Power Company, generating electricity by dynamo, belted to a water turbine at the Wolverine Chair Factory, lit up 16 brush-arc lamps.
www.usd.edu/phys/courses/scst601/ hydroelectric/hydro.ppt
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– By 1940 - 40% of electrical generation was hydropower
– Between 1921 and 1940 - conventional capacity in the U.S. tripled; almost tripled again between 1940 and 1980
– Currently - about 10% of U.S. electricity comes from hydropower.
www.usd.edu/phys/courses/scst601/ hydroelectric/hydro.ppt
History of Hydroelectric History of Hydroelectric
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www.usd.edu/phys/courses/scst601/ hydroelectric/hydro.ppt
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Turbine TechnologiesReaction
fully immersed in fluidshape of blades produces rotation
www.usd.edu/phys/courses/scst601/ hydroelectric/hydro.ppt
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www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
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Tidal Power PlantTidal Power Plant
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www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
Energy EfficiencySolar EnergyHydropowerWind PowerWind PowerBiomassGeothermalSustainability
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Rotary WindmillRotary Windmill
www.usd.edu/phys/courses/scst601/wind_energy.ppt
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www.usd.edu/phys/courses/scst601/wind_energy.ppt
Vertical BladesVertical Blades
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www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
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Energy from WindEnergy from Wind Production of electricity and hydrogen
gas by wind farms is expected to increase
Western Europe currently leads in the development of wind power
Land used for wind farms also can be used for ranching or crops and most profits stay in local communitiesNorth Dakota
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OptimizationOptimizationLow Torque – Rapid Speed
good for electrical generationHigh Torque – Slow Speed
good for pumping waterSmall generator
low wind speedscaptures small amount of energy
Large generatorhigh wind speedsmay not turn at low speeds
www.usd.edu/phys/courses/scst601/wind_energy.ppt
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www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
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Source: American Wind Energy Associationwww.usd.edu/phys/courses/scst601/wind_energy.ppt
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Energy EfficiencySolar EnergyHydropowerWind PowerBiomassBiomassGeothermalSustainability
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Energy from Energy from BiomassBiomass In the developing world, most
people heat homes and cook by burning wood or charcoal
Plant materials and animal wastes also can be converted into biofuels, BiogasLiquid ethanolLiquid methanol
Urban wastes can be burned in incinerators to produce electricity and heat
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Types of Types of Biomass Biomass
FuelFuel
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ConversionProcesses
BiomassFeedstock
– Trees– Forest Residues – Grasses– Agricultural Crops– Agricultural Residues– Animal Wastes– Municipal Solid Waste
Fuels: Ethanol Renewable Diesel Methanol HydrogenElectricityHeatProducts– Plastics– Foams – Solvents– Coatings– Chemical
Intermediates– Phenolics– Adhesives– Fatty acids– Acetic Acid– Carbon black– Paints– Dyes, Pigments, and
Ink– Detergents– Etc.
BiorefineryBiorefinery
- Acid Hydrolysis/Fermentation- Enzymatic Fermentation- Gas/liquid Fermentation- Thermochemical Processes- Gasification/Pyrolysis- Combustion- Co-firing
www.sc.doe.gov/bes/besac/BESACGarman08-02-01.ppt
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Energy EfficiencySolar EnergyHydropowerWind PowerBiomassGeothermalGeothermalSustainability
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Geothermal EnergyGeothermal Energy Geothermal energy can be used to
heat buildings and to produce electricity
Geothermal reservoirs can be depleted if heat is removed faster than natural processes renew it, but the potential supply is vast
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TechnologyTechnologyGeothermal Heat Pumps
shallow ground energyDirect-Use
hot water can be piped to facilitiesPower Plants
steam and hot water drive turbinesdry steam plantsflash steam plantsbinary cycle plants
www.usd.edu/phys/courses/scst601/ geothermal/GeothermalEnergy.ppt
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Dry Steam Power PlantsDry Steam Power PlantsHydrothermal
fluids are primarily steamSteam goes
directly to turbine
No fossil fuels
www.usd.edu/phys/courses/scst601/ geothermal/GeothermalEnergy.ppt
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Flash Steam Power PlantFlash Steam Power PlantFluids above 200
degrees CelsiusFluid is sprayed into
tank at lower pressure
Fluid rapidly vaporizes
Steam drives turbine
www.usd.edu/phys/courses/scst601/ geothermal/GeothermalEnergy.ppt
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Binary Cycle Power PlantBinary Cycle Power Plant
Cooler water (below 200 degrees Celsius)Hot thermal fluid
and a second fluid pass through heat exchanger
www.usd.edu/phys/courses/scst601/ geothermal/GeothermalEnergy.ppt
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BenefitsBenefitsClean Energy
one sixth of carbon dioxide vs. natural gasvery little if any nitrous oxide or sulfur
compoundsAvailability
24 hours a day, 365 days a yearHomegrownRenewable
www.usd.edu/phys/courses/scst601/ geothermal/GeothermalEnergy.ppt
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Environmental EffectsEnvironmental EffectsOnly emission is steamSalts and dissolved minerals reinjectedSome sludge produced
Mineral extractionLittle Visual Impact
Small acreage, no fuel storage facilities
www.usd.edu/phys/courses/scst601/ geothermal/GeothermalEnergy.ppt
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LocationLocationHot geothermal fluidLow mineral and gas contentShallow aquifers
Producing and reinjecting the fluidPrivate land
Simplifies permit processProximity to transmission lines
www.usd.edu/phys/courses/scst601/ geothermal/GeothermalEnergy.ppt
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www.eren.doe.gov/power/consumer/ rebasics_geothermal.html
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FutureFutureOnly tiny fraction is currently
used Dry hot rock heated by molten
magma Drill into rock and circulate
water
www.usd.edu/phys/courses/scst601/ geothermal/GeothermalEnergy.ppt
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Energy EfficiencySolar EnergyHydropowerWind PowerBiomassGeothermalSustainabilitySustainability
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Suggestions to make the transition to a moresustainable energy future.
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