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dpurdy

Energy Resources: Wave power - 1 views

home.clara.net/...wave.htm

wave pollution sustainable

shared by dpurdy on 03 Nov 11 - Cached
  • Ocean waves are caused by the wind as it blows across the sea. Waves are a powerful source of energy.
  • How it works There are several methods of getting energy from waves. One of them works like a swimming pool wave machine in reverse. At a swimming pool, air is blown in and out of a chamber beside the pool, which makes the water outside bob up and down, causing waves.   At a wave power station, the waves arriving cause the water in the chamber to rise and fall, which means that air is forced in and out of the hole in the top of the chamber. We place a turbine in this hole, which is turned by the air rushing in and out. The turbine turns a generator.
  • Once you've built a wave power station, the energy is free, needs no fuel and produces no waste or pollution.
  • ...4 more annotations...
  • Not expensive to operate and maintain.
  • Needs a suitable site, where waves are consistently strong.
  • Some designs are noisy. But then again, so are waves, so any noise is unlikely to be a problem.
  • Is it renewable? Wave power is renewable.
dpurdy

What is wave energy? | Pelamis Wave Power - 4 views

www.pelamiswave.com/...what-is-wave-energy

wave what pollution sustainable co2 form

shared by dpurdy on 03 Nov 11 - No Cached
  • What is wave energy? Waves are generated by the passage of wind across the surface of the sea.  Energy is transferred from the wind to the waves.  Waves travel vast distances across the ocean and at great speed and the energy is concentrated near the water surface.  The energy within a wave is proportional to the square of the wave height.  Therefore a two-meter high wave has four times the power of a one-meter high wave. The longer and stronger the wind blows over the surface of the sea, the higher, longer, faster and more powerful the sea is.
  • Although wave energy is a form of concentrated wind energy, as it has often travelled over large distances it is regularly out of phase with the local wind conditions.  Wave energy can therefore help to balance output variability from other renewable sources and maximise the efficient use of the electricity networks.   Wave energy is also more predictable than many other forms of renewable energy, such as wind or solar, and can be forecast accurately up to five days in advance.
  • Wave energy is clean and renewable!  It is one of the last renewable energy forms which mankind has yet to harness, and its potential is huge.
  • ...1 more annotation...
  • Wave energy could play a major part in the world’s efforts to combat climate change, potentially displacing 1 – 2 billion tonnes of CO2 per annum from conventional fossil fuel generating sources.
dpurdy

Biomass Energy Home Page Biomass Energy: Cost of Production - 0 views

www.oregon.gov/...Cost.shtml

cost

shared by dpurdy on 03 Nov 11 - No Cached
  • The cost of producing ethanol varies with the cost of the feedstock used and the scale of production. Approximately 85 percent of ethanol production capacity in the United States relies on corn feedstock. The cost of producing ethanol from corn is estimated to be about $1.10 per gallon.
  • Because a gallon of ethanol contains less energy than a gallon of gasoline, the production cost of ethanol must be multiplied by a factor of 1.5 to make an energy-cost comparison with gasoline. This means that if ethanol costs $1.10 per gallon to produce, then the effective cost per gallon to equal the energy contained in a gallon of gasoline is $1.65. In contrast, the current wholesale price of gasoline is about 90 cents per gallon.
  • A major hurdle facing commercial biodiesel production is the cost of producing the fuel. Vegetable oil seed procurement, transport, storage and oil extraction accounts for at least 75 percent of the cost of producing biodiesel. The cost varies depending on the feedstock used. For example, based on the market price for industrial rapeseed grown in Washington and Idaho, the estimated cost of producing biodiesel is $2.56 per gallon of rapeseed methyl ester. Recent estimates put the cost of production in the range of $1.30 per gallon (using waste grease feedstock) to $2.00 or more per gallon using soybean oil.
  • anonymous on 28 Sep 13
     
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sokolkyl00

Solar Power - Advantages and Disadvantages - Sustainable Development Information - 0 views

www.sustainabledevelopmentinfo.com/r-advantages-and-disadvantages

solar sustainable

shared by sokolkyl00 on 20 Sep 13 - No Cached
  • By converting the power of the sun into electricity, solar energy is clean, green, will never run out and, after the initial cost of the solar panels, is entirely free
  • The sun is constant – it will always be there and is therefore a reliable, utterly renewable source of energy.
  • As it does not rely on the burning of harmful fuels to generate electricity, solar power is non-polluting – it does not contribute to global warming or greenhouse gas emissions.
bakereli00

What are Biofuels? - 0 views

www.biofuelsassociation.com.au/...what-are-biofuels

biofuel form

shared by bakereli00 on 20 Sep 13 - No Cached
  • Biofuels are liquid fuels which have been derived from other materials such as waste plant and animal matter. There are two main types of biofuels – bioethanol and biodiesel. Bioethanol is used as a replacement for gasoline and biodiesel is used as a replacement for diesel.
kilburnzac00

How Solar Works | Solar Panel Installation Los Angeles - 0 views

www.gosolarcenter.com/How-Solar-Works.aspx

sustainable co2 cost solar

shared by kilburnzac00 on 23 Sep 13 - No Cached
  • Solar energy is an infinitely renewable resource that uses the sun's rays to generate electricity for use in your home. By going solar, you can reduce your energy costs and lower your dependence on fossil fuels, thereby making your own contribution to a cleaner environment. Generally, the solar energy systems we use work as follows:
geczyluk99

A Pollution-Free Hydrogen Economy? Not So Soon | MIT Technology Review - 0 views

www.technologyreview.com/...e-hydrogen-economy-not-so-soon

hydrogen economy co2 pollution

shared by geczyluk99 on 24 Sep 13 - No Cached
  • There’s a much cheaper way to produce hydrogen: spray steam on white-hot coals and out comes mostly hydrogen gas (40 percent) and carbon monoxide (50 percent), a mixture known appropriately as “water gas.” It’s the least expensive way to make hydrogen. Unfortunately, the carbon monoxide produced along with it is highly poisonous. To extract the last bit of energy, the carbon monoxide can be burned, and that turns it into the greenhouse gas carbon dioxide.
  • Electric cars powered by hydrogen fuel cells don’t produce greenhouse-enhancing carbon dioxide. But producing hydrogen does-and if we want to reduce our petroleum dependence, we’re going to have to reconcile ourselves to that fact.
sokolkyl00

Switch to Clean Energy | A Student's Guide to Global Climate Change | US EPA - 1 views

www.epa.gov/...clean-energy.html

co2 solar

shared by sokolkyl00 on 25 Sep 13 - No Cached
  • When we get electricity from renewable energy sources like wind and solar power, we avoid the carbon dioxide emissions that would have come from burning fossil fuels like coal, oil, or natural gas.
waiteric00

How much CO2 does solar energy produce? | Ecooutfitters.net - 0 views

www.ecooutfitters.net/...o2-emissions-with-solar-panels

co2

shared by waiteric00 on 23 Sep 13 - No Cached
  • Let’s not hide the fact that manufacturing solar panels requires resources, fossil fuels that release CO2 emissions and add to our carbon footprint. However, it’s been shown in numerous studies that solar panel production releases nowhere near as much CO2 and other greenhouse gases as electric generated from coal, oil, natural gas, etc. (And you still need to produce the equipment to generate electricity from those sources as well.)
thibodeaueth00

HowStuffWorks "10 Incredible Wind Power Facts" - 0 views

science.howstuffworks.com/...10-wind-power-facts3.htm

wind

shared by thibodeaueth00 on 23 Sep 13 - No Cached
  • 8: One Megawatt of Wind Energy = 2,600 Fewer Tons of Carbon Dioxide So, with all the noise about clean energy, what kind of improvement are we really talking about with wind? Consider that every year 1MW of wind energy can offset approximately 2,600 tons of carbon dioxide (CO2) [source: NREL], and the interest comes into focus. The simple math is less fossil fuel consumption equals less CO2. And measuring carbon reduction has become a key benchmark for monitoring the progress of alternative energy adoption.
olsentri00

Energy Article, Energy Conservation Information, Future Fuels Facts -- National Geographic - 0 views

science.nationalgeographic.com/...after-oil-energy.html

National Geographics Website ttl__:windpower.09_google_solar_web.ngg

shared by olsentri00 on 24 Sep 13 - Cached
  • olsentri00 on 24 Sep 13
     
    Written by Michael Parfit Republished from the pages of National Geographic magazine Freedom! I stand in a cluttered room surrounded by the debris of electrical enthusiasm: wire peelings, snippets of copper, yellow connectors, insulated pliers. For me these are the tools of freedom. I have just installed a dozen solar panels on my roof, and they work.
olsentri00

Wind Power: A Lucrative Renewable Energy Source - 0 views

sites.duke.edu/...comparison

solar wind

shared by olsentri00 on 24 Sep 13 - No Cached
  • olsentri00 on 24 Sep 13
     
    There are many renewable energy sources out there right now, continuing to develop in their technology and production. All of these resources have very high capital cost inputs that are hard to compete with cheap natural gas. However, these new resources are abundant, some even limitless, and unlike natural gas, fuels and oil, they will be around for a long time.
gordonaus00

Wind energy has been around for thousands of years. But man is now finding ever more ingenious uses for this renewable energy source. - 0 views

www.miningoilgasjobs.com.au/...wind-energy.aspx

wind form convert thousands man

shared by gordonaus00 on 24 Sep 13 - No Cached
  • Wind Energy The answer is blowin’ in the wind How is man going to keep up with increasing energy demand while the amount of available fossil fuel diminishes? The answer could be wind power, the capturing of the energy contained in gusts of wind. What is wind Energy?
  • Man has been using wind energy for thousands of years. Windmills, sails and even kites are all devices designed to harness the awesome power produced when the wind blows. Even modern aircraft benefit from wind power. Pilots flying westward usually expend much effort trying to make sure they place themselves in the jet stream, the hundred mile per hour wind caused by the earth spinning. Now engineers are able to convert such power into electricity, pump it into grids and provide energy for homes.
hertznerkar00

What is U.S. electricity generation by energy source? - FAQ - U.S. Energy Information Administration (EIA) - 1 views

www.eia.gov/...faq.cfm

wind current

shared by hertznerkar00 on 25 Sep 13 - No Cached
  • What is U.S. electricity generation by energy source? In 2012, the United States generated about 4,054 billion kilowatthours of electricity.  About 68% of the electricity generated was from fossil fuel (coal, natural gas, and petroleum), with 37% attributed from coal. Energy sources and percent share of  total electricity generation in 2012 were:  Coal 37% Natural Gas 30% Nuclear 19% Hydropower 7% Other Renewable 5% Biomass 1.42% Geothermal 0.41% Solar 0.11% Wind 3.46% Petroleum 1% Other Gases < 1%
wooddan99

geothermal CO2 emissions - 0 views

www.energyadvocate.com/air_geo.htm

geothermal co2

shared by wooddan99 on 25 Sep 13 - No Cached
  • Somewhat surprisingly, the hot air that carries the heat from the earth at geothermal sites also contains carbon dioxide, CO2, the Greenhouse Gas that sends anti-technologists into a frenzy.  The suite of 20 geothermal sites from which Southern California Electric is obligated to buy electricity produces 730 tonnes of CO2 for every gigawatt-hour (GWh) of electricity produced.  Across the spectrum of all natural-gas power plants in the US, the average CO2 production is 519 tonnes per GWh.  That is, the geothermal power plants, which burn no fossil fuels whatsoever, produce 41% more CO2 than the run-of-the-mill natural gas power plant for the same amount of electrical energy produced.
crandallmad00

Tidal Energy : Advantages and Disadvantages - 0 views

www.ianswer4u.com/...dal-energy-advantages-and.html

tide wave

shared by crandallmad00 on 30 Sep 13 - No Cached
  • Advantages of Tidal Energy1)  It is an inexhaustible source of energy. 2)  Tidal energy is environment friendly energy and doesn't produce greenhouse gases. 3)  As 71% of Earth’s surface is covered by water, there is scope to generate this energy on large scale. 4)  We can predict the rise and fall of tides as they follow cyclic fashion. 5) Efficiency of tidal power is far greater as compared to coal, solar or wind energy. Its efficiency is around 80%. 6)  Although cost of construction of tidal power is high but maintenance costs are relatively low. 7)  Tidal Energy doesn’t require any kind of fuel to run. 8)  The life of tidal energy power plant is very long. 9)  The energy density of tidal energy is relatively higher than other renewable energy sources.
  • Disadvantages of Tidal Energy 1)  Cost of construction of tidal power plant is high. 2)  There are very few ideal locations for construction of plant and they too are localized to coastal regions only. 3)  Intensity of sea waves is unpredictable and there can be damage to power generation units. 4)  Influences aquatic life adversely and can disrupt migration of fish. 5)  The actual generation is for a short period of time. The tides only happen twice a day so electricity can be produced only for that time. 6)  Frozen sea, low or weak tides, straight shorelines, low tidal rise or fall are some of the obstructions. 7)  This technology is still not cost effective and more technological advancements are required to make it commercially viable. 8)  Usually the places where tidal energy is produced are far away from the places where it is consumed. This transmission is expensive and difficult. Tidal Energy is thus a clean source of energy and doesn’t require much land or other resources as in harnessing energy from other sources. However, the energy generated is not much as high and low tides occur only twice a day and continuous energy production is not possible.
  • crandallmad00 on 30 Sep 13
     
    Lets now discuss the advantages and
hollale00

Ethanol: What Is It? - Ethanol - University of Illinois Extension - 0 views

web.extension.illinois.edu/ethanol

ethanol

shared by hollale00 on 30 Sep 13 - No Cached
  • Ethanol is a grain alcohol that can be blended with gasoline and used in motor vehicles. Many gasoline stations provide a blended fuel, which typically is 10 percent ethanol and 90 percent gasoline.
deepat00

How Geothermal Energy Works - 0 views

www.conserve-energy-future.com/HowGeothermalEnergyWorks.php

fossil fuels geothermal convert

shared by deepat00 on 07 Oct 13 - No Cached
  • The amount with in the earth’s surface contains 50,000 times more energy than all the oil and natural gas resources in the world.
  • To get that heat, water is pumped down an “injection well”. Then it filters through the cracks in the rocks where they are at a high temperature. The water then returns via the “recovery well” under pressure in the form of steam. That steam is captured and is used to drive electric generators.
ackleysam99

The Disadvantages Of A Solar Generator | LIVESTRONG.COM - 1 views

www.livestrong.com/...dvantages-of-a-solar-generator

cost

shared by ackleysam99 on 22 Oct 12 - No Cached
  • Solar power generators offer a no-emission alternative to ones that use fossil fuel. These generators come in small, portable sizes for temporary power or larger arrays for permanent energy production.
  • availability of sunlight given local weather conditions and the resilience of the photovoltaic cells when purchasing a solar generator.
  • Most photovoltaic cells rely on silicon crystals to generate power. Demand for silicon has driven its price higher, meaning a solar generator can require a sizable initial investment. In fact, SolarBuzz notes that 45 percent of solar cell cost comes from the silicon wafer. Typical 2 kilowatt solar generators cost from $16,000 to $20,000.
  • ...2 more annotations...
  • Solar generators powerful enough to supply electricity for a whole home also require a lot of space, with roof-mounted panels needing at least 50 square feet and possibly as much as
  • 1,000 square feet. Lack of Durability
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