Skip to main content

Home/ qmstech2/ Group items matching "from" in title, tags, annotations or url

Group items matching
in title, tags, annotations or url

Sort By: Relevance | Date Filter: All | Bookmarks | Topics Simple Middle
lemairenat98

Tidal Power | BC Sustainable Energy Association - 1 views

www.bcsea.org/...tidal-power

tide cost

shared by lemairenat98 on 11 Mar 13 - No Cached
  • However, estuaries are among the world’s most productive and sensitive ecosystems, and barrages cause large disruptions to their natural processes. We will therefore not further consider barrage based tidal power as a truly sustainable energy resource.
  • While there are non-tidal based ocean currents such as the Gulf Stream, those are usually too diffuse to be a practical energy source. The tides cause water to flow inwards from the ocean twice a day during flood tides, and outwards during ebb tides. Additional monthly and annual cycles vary the strength of this current on a monthly and annual basis. Narrow and shallow constrictions produce the fastest and most powerful movements, whose energy can be captured using submerged turbines.
  • BC Hydro’s 2002 Green Energy Study for BC estimated the realistic energy potential for tidal current energy generation in BC to be 20 TWhrs/year. The estimated cost was 11 cents/kWhr for a large (800 MW) site, and 25 cents/kWhr for a small (43 MW) site. The best sites are in the Strait of Georgia and Johnstone Strait, which are both relatively close to the main centers of consumption.
  • ...2 more annotations...
  • The second type is based on utilizing the fast-flowing marine currents caused by tidal action. While there are non-tidal based ocean currents such as the Gulf Stream, those are usually too diffuse to be a practical energy source. The tides cause water to flow inwards from the ocean twice a day during flood tides, and outwards during ebb tides.
  • Nevertheless, it is a truly sustainable energy source which is also very predictable. It is not subject to the vagaries of weather or climate change, and while the energy varies, it follows a predictable pattern that is known many years in advance.
  • mchughkon99 on 11 Mar 13
     
    oceanic tides 
  • murphymat98 on 11 Mar 13
     
    The second type is based on utilizing the fast-flowing marine currents caused by tidal action....it is a truly sustainable energy source which is also very predictable. It is not subject to the vagaries of weather or climate change, and while the energy varies, it follows a predictable pattern that is known many years in advance.
  • lemairenat98 on 15 Mar 13
     
    " costs are expected to fall to between 5 and 7 cents/kWhr."
bishophan00

Wind Power Information, Wind Power Facts - National Geographic - 1 views

environment.nationalgeographic.com/...wind-power-profile

wind form

shared by bishophan00 on 11 Mar 13 - No Cached
  • Wind is a clean source of renewable energy that produces no air or water pollution.
  • Wind is the movement of air from an area of high pressure to an area of low pressure. In fact, wind exists because the sun unevenly heats the surface of the Earth. As hot air rises, cooler air moves in to fill the void. As long as the sun shines, the wind will blow. And as long as the wind blows, people will harness it to power their lives.
  • The wind spins the blades, which turn a shaft connected to a generator that produces electricity. Other turbines work the same way, but the turbine is on a vertical axis and the blades look like a giant egg beater.
  • ...5 more annotations...
  • At the end of last year, global capacity was more than 70,000 megawatts.
  • And since the wind is free, operational costs are nearly zero once a turbine is erected.
  • Globally, generation more than quadrupled between 2000 and 2006.
  • n the energy-hungry United States, a single megawatt is enough electricity to power about 250 homes.
  • ndustry experts predict that if this pace of growth continues, by 2050 the answer to one third of the world's electricity needs will be found blowing in the wind.
  • barnardnat99 on 11 Mar 13
     
    where wind energy come from
  • conwayjam99 on 13 Mar 13
     
    ". At the end of last year, global capacity was more than 70,000 megawatts. In the energy-hungry United States, a single megawatt is enough electricity to power about 250 homes. "
mcdermottaar99

Generate Your Own Wind Energy - 0 views

www.sustainablestuff.co.uk/GenerateYourOwnWindEnergy.html

wind energy cost pollution

shared by mcdermottaar99 on 11 Mar 13 - No Cached
  • As with installing your own solar energy, installing wind energy will help to reduce carbon emissions, which damage the environment and will save money.
  • It's only downfall is possibly the visual impact it makes on the landscape: A tall 'small scale' generator could attract wide rebuttal from neighbours, and this is worth considering before embarking on a wind generation project. However, if you live in a remote area, which benefits from exposure to the wind, or have neighbours that are happy for you to go ahead with the project, installing wind power can be an economically viable way to capitalise on natural, renewable resources
  • A wind generator will cost in the region of £3'000 - £15'000, at about £3'000 per kilowatt.
  • ...1 more annotation...
  • You can expect a wind generator to pay for itself in little over five years, and with conventional energy prices soaring, the dividends will increase with time.
leonardsar99

How long has solar power been around? - Fort Smith Alternative Energy | Examiner.com - 0 views

www.examiner.com/...ng-has-solar-power-been-around

solar history

shared by leonardsar99 on 11 Mar 13 - No Cached
  • Using the sun's power has been around as early as the 7th century B.C. when people were using it to build fires. It is hypothesized that in 2nd century B.C. Archimedes used the reflective surfaces of bronze shields to burn ships invading Syracuse. However, it was not until 1973 when the Greek navy actually experimented with the notion and successfully burned a wooden ship at 50 meters. Sunrooms were common in houses and public buildings in the 6th century A.D. These were so common that "sun rights" were given to individuals. Swiss scientist Horace de Saussure was credited with building the world’s first solar collector in 1767. For a more descriptive timeline, this timeline lists the milestones in the historical development of solar technology from the 7th century B.C. up to today.
  • Using the sun's power has been around as early as the 7th century B.C. when people were using it to build fires. It is hypothesized that in 2nd century B.C. Archimedes used the reflective surfaces of bronze shields to burn ships invading Syracuse. However, it was not until 1973 when the Greek navy actually experimented with the notion and successfully burned a wooden ship at 50 meters. Sunrooms were common in houses and public buildings in the 6th century A.D. These were so common that "sun rights" were given to individuals. Swiss scientist Horace de Saussure was credited with building the world’s first solar collector in 1767. For a more descriptive timeline, this timeline lists the milestones in the historical development of solar technology from the 7th century B.C. up to today.
  • whalenkil98 on 11 Mar 13
     
    how long has solar energy been around?
sconzomic99

What is tidal energy - How tidal works? - Tidal energy - 0 views

www.solarpowernotes.com/...tidal-energy.html

tide energy cost sustainable

shared by sconzomic99 on 11 Mar 13 - Cached
  • tidal energy uses tidal strength of water and back and forth movement  in seas, rivers or oceans. Tidal power exploits kinetic energy of water that power water turbines with its movement between the wings which rotate the turbine to produce electricity.
  • For producing significant amount of energy out of tidal water turbines, range of tides should be high and substantial amount of water should be there for pushing water through the turbine.
  • It is significantly important to spot the appropriate place which provide suitable and sustainable conditions to produce tidal energy, there are plenty of places around the globe which provide good conditions for installing water turbines and then produce electricity use tidal power of oceans in the location.
  • ...5 more annotations...
  • Once tidal power plant is built its’ electricity is free. It does not emit greenhouse gasses, carbon emission gasses which pollute environment. It does not have any dependency of any fossil fuel including furnace oil, gasses, etc; it needs no oil what so ever to produce electricity. Tidal power technology is renewable energy, which uses tidal and waves of same water for producing electricity over and over again. Tidal power technology like all renewable energy is clean energy and does not leave much impact on environment. Tidal power plants does not require much maintenance, therefore it is maintenance cost free. Tidal energy stations have about 80 % efficiency ratio, where as fossil fuel have approximately 30 % for efficiency levels. Tides in oceans are very predictable, its easy to judge when strong tides are going to show up from water consider weather and other conditions. The better tides and wave strengths of the oceans is, improved the efficiency of the station is. Electricity does not fluctuate on large scale using tidal energy as it happens in solar power technology.
  • Electricity can only be produced when tides are high in the sea, once ocean is calm and does not flow certain level of waves, it cannot produce electricity. Therefore electricity can be produced for only 10 hrs a day in presence of tides.
  • Tidal power plants are not cost effective. Millions of dollars are utilized for developing tidal power which could provide electricity in Megawatts.
  • Once tidal power plant is built its’ electricity is free. It does not emit greenhouse gasses, carbon emission gasses which pollute environment. It does not have any dependency of any fossil fuel including furnace oil, gasses, etc; it needs no oil what so ever to produce electricity. Tidal power technology is renewable energy, which uses tidal and waves of same water for producing electricity over and over again. Tidal power technology like all renewable energy is clean energy and does not leave much impact on environment. Tidal power plants does not require much maintenance, therefore it is maintenance cost free. Tidal energy stations have about 80 % efficiency ratio, where as fossil fuel have approximately 30 % for efficiency levels. Tides in oceans are very predictable, its easy to judge when strong tides are going to show up from water consider weather and other conditions. The better tides and wave strengths of the oceans is, improved the efficiency of the station is. Electricity does not fluctuate on large scale using tidal energy as it happens in solar power technology.
  • not appropriate to risk £15 millions worth of money. This is the main reason why this project is yet start
glinbizzivic98

Geothermal Energy | Center for Climate and Energy Solutions - 0 views

www.c2es.org/...geothermal

geothermal co2

shared by glinbizzivic98 on 11 Mar 13 - No Cached
  • Table 1: Levelized cost of capital electricityInitial Capital InvestmentCost of Power (cents/kWh)*$2400 per KW3.99 - 5.76$2900 per KW4.40 – 6.54$3400 per KW4.81 – 7.33 
  • A price on carbon, such as that which would exist under a GHG cap-and-trade program, would raise the cost of electricity produced from fossil fuels relative to the cost of electricity from renewable sources, such as geothermal energy, and other lower-carbon technologies.
  • glinbizzivic98 on 12 Mar 13
     
    "Geothermal energy can be used for electricity generation, heat pumps, or direct uses. This document focuses only on the traditional, commercially available technologies that produce electricity by exploiting the naturally occurring heat of the earth. Enhanced geothermal systems, which utilize advanced (often experimental) drilling and fluid injection techniques to augment and expand the availability of geothermal resources, are the subject of a separate factsheet (see Climate TechBook: Enhanced Geothermal Systems)."
stewartlas97

Wind - 0 views

www.esru.strath.ac.uk/...wind.htm

shared by stewartlas97 on 13 Mar 13 - No Cached
  • stewartlas97 on 13 Mar 13
     
    "This movement is complicated by several other factors that means wind does not always flow from the equator in the direction of either pole. The rotation of the earth creates a force known as the Coriolis force and this factor along with the temperature differences create winds at high altitudes above the earth on a large scale. These Geostrophic winds play a part in the wind's that affect us in everyday life, but local winds are largely affected by the surface of the earth - which is neither uniform or smooth. The earth has large flat plains (desert regions), areas covered with plant life (rainforests), very uneven regions (mountain ranges) and very smooth regions (seas and oceans), all of which affect the wind near the surface of the earth to varying degrees. These areas of the earth all have different values of roughness, which can impeded the flow of air. Obviously the lower the value of roughness the less the air is impeded."
barnardnat99

Energy Report: U.S. Wind Energy Production and Manufacturing Surges, Supporting Jobs and Diversifying U.S. Energy Economy | Department of Energy - 0 views

www.doe.gov/...ing-surges-supporting-jobs-and

shared by barnardnat99 on 22 Mar 13 - No Cached
  • The report finds that in 2011, roughly 6,800 megawatts (MW) of new wind power capacity was added to the U.S. grid, a 31 percent increase from 2010 installations.  The United States’ wind power capacity reached 47,000 MW by the end of 2011 and has since grown to 50,000 MW, enough electricity to power 13 million homes annually or as many as in Nevada, Colorado, Wisconsin, Virginia, Alabama, and Connecticut combined. The country’s cumulative installed wind energy capacity grew 16 percent from 2010, and has increased more than18-fold since 2000.  The report also finds that six states now meet more than 10 percent of their total electricity needs with wind power.
dpurdy

Energy - Ocean and Wave - 0 views

renet-eu-india.com/energywave.php

wave form

shared by dpurdy on 23 Mar 13 - No Cached
  • More than 70% of Earth's surface is covered by oceans which contain two types of energy: mechanical energy from waves and tides and Thermal energy from solar radiations falling on the ocean surface making them the world's largest solar collectors
dpurdy

Wind turbine - Wikipedia, the free encyclopedia - 1 views

en.wikipedia.org/...Wind_turbine

wind convert history first

shared by dpurdy on 21 Mar 13 - Cached
  • A wind turbine
  • converts kinetic energy from the wind
  • into mechanical energy
  • ...1 more annotation...
  • The first electricity-generating wind turbine was a battery charging machine installed in July 1887 by Scottish academic James Blyth to light his holiday home in Marykirk, Scotland.
conwayjam99

Wind Energy, Noise Pollution - Robert Bryce - National Review Online - 0 views

www.nationalreview.com/...y-noise-pollution-robert-bryce

pollution wind

shared by conwayjam99 on 20 Mar 13 - No Cached
  • “headaches, ear pain, nausea, blurred vision, anxiety, memory loss,
  • conwayjam99 on 20 Mar 13
     
    "headaches, ear pain, nausea, blurred vision, anxiety, memory loss, are all symptoms from the noise of wind turbines 
dittrichcai99

Geothermal Basics Current Use - 1 views

geo-energy.org/currentUse.aspx

geothermal

shared by dittrichcai99 on 18 Mar 13 - No Cached
  • dittrichcai99 on 18 Mar 13
     
    "The geothermal power production in the U.S. today provides enough electricity to meet the electricity needs of about 2.4 million California households. (1) This does not include contributions from geothermal heat pumps and direct heating uses."
dpurdy

Why a hydrogen economy doesn't make sense - 0 views

phys.org/news85074285.html

fuel cell form

shared by dpurdy on 24 Mar 13 - No Cached
  • dpurdy on 24 Mar 13
     
    How inefficient it is to make hydrogen from electricity
dpurdy

How much CO2 does one solar panel create? | MNN - Mother Nature Network - 2 views

www.mnn.com/...o2-does-one-solar-panel-create

solar co2 fossil fuels

shared by dpurdy on 06 Apr 13 - Cached
  • solar panels are at least 20x better on the climate than coal, kWh for kWh.
  • Based on that study, solar PV works out to about 50g of CO2 per kWh compared to coal's 975g of CO2 per kWh, or about 20x "cleaner."
  • dpurdy on 06 Apr 13
     
    Comparison of CO2 from photovoltaics and coal. 
dpurdy

The hidden costs of fossil fuels - and biofuels, too - CSMonitor.com - 1 views

www.csmonitor.com/...-fossil-fuels-and-biofuels-too

fossil fuels pollution cost biofuel

shared by dpurdy on 06 Apr 13 - No Cached
  • Climate considerations aside, damages wrought by ethanol made from corn were usually similar to, or even slightly worse, than damages from gasoline. That’s because of the extra energy needed to convert corn to biofuel.
dpurdy

How Does Tidal Power Work? - Energy Informative - 1 views

energyinformative.org/how-does-tidal-power-work

tidal potential

shared by dpurdy on 03 Nov 12 - No Cached
  • 450 TWh is the estimated yearly potential of electric power that can be produced from tidal energy. In addition to this comes a large and not yet estimated potential in river flows.
  • Tidal stream generators are very similar to wind turbines except their below the water surface instead of above or on land. The turbine and generator converts the movement of water coming from change in tide, the kinetic energy, into electricity. Water is 830 times denser than air and therefore can generate electricity at lower speeds than wind turbines.
smithkai143

Re: How is tidal power converted to electricity? - 0 views

www.madsci.org/...1017154685.Ph.r.html

tidal convert how electricity

shared by smithkai143 on 29 Oct 12 - No Cached
  • Tidal Energy originates from gravitational energy. Imagine you have a damn- like structure built along a river. During the high tide, the water flows into the river, causing the turbine to rotate and thus generating electricity. During the low tide, the water flows from the river to the sea, again, turning the turbine. (An electricity generating turbine consists of rotating wires surrounded by strong fixed magnetic field)
phinneycha99

Energy and kids - 1 views

www.kids.esdb.bg/solar.html

solar how converted

shared by phinneycha99 on 26 Oct 12 - No Cached
  • phinneycha99 on 26 Oct 12
     
    "Photovoltaic cells, like batteries, generate direct current (DC) which is generally used for small loads (electronic equipment).  When DC from photovoltaic cells is used for commercial applications or sold to electric utilities using the electric grid, it must be converted to alternating current (AC) using inverters, solid state devices that convert DC power to AC. "
tuckeremi99

Is Current Wind Growth Sustainable? | Renewable Energy World Magazine Article - 0 views

www.renewableenergyworld.com/...the-big-question1

wind sustainable

shared by tuckeremi99 on 22 Oct 12 - No Cached
  • wind farms are not only capital intensive but also have a long gestation period – could prove to be prohibitive for many potential investors.
  • terms of global policy, governments need to boost investments in onshore and offshore wind generation through the right mix of supportive policies and incentives.
  • wind energy will become even more attractive as it serves as an insurance against future increases in fuel and carbon prices, while reducing our dependency on fossil fuels imported from volatile regions.
  • ...17 more annotations...
  • Both in Europe and in the US, some 40% of all new power generating capacity installed in the past two years was wind energy. If the economic crisis continues, however, the reduction in power demand will start to impact wind energy, simply because of lower demand for new power plants. Nevertheless, the medium and long-term outlook remains very healthy, as political momentum is building towards a low carbon economy, without which humankind will not overcome three of the biggest concerns of our time – climate protection, energy security and the provision of jobs.
  • Wind power’s credentials as a rapidly deployable clean technology have put it at the forefront in the fight against climate change. Neither new nuclear capacity or carbon capture and storage (CCS) will contribute to CO2 reductions within the timeframe that the climate scientists give us. As a no-fuel, no-carbon emissions source of electricity, wind energy will play a big part in reducing carbon emissions before 2020.
  • A key element for policy makers is to dramatically improve competition in power markets, to ensure that investors, rather than consumers, are exposed to
  • The growth in wind power capacity has shown no signs of slowing, even in these tough economic times. For two years running there has been more new wind power capacity installed than any other power generating technology in Europe – including coal, gas and nuclear. In 2009 the European market for wind turbines experienced a 23% growth rate, the same as the average growth rate over the last 15 years.
  • future carbon and fuel price risk.
  • Wind power is a leader now, and will remain so in the future, attracting big investments and creating jobs. There is a boom waiting to happen in offshore wind energy. But, Europe’s ageing electricity grids must be upgraded and extended, and the EU must also pursue a drive to build an offshore grid in the North and Baltic seas that will connect offshore wind farms to the shore, piping vast amounts of CO2-free energy to consumers at affordable prices.
  • cleaner energy
  • he fact that wind is the most cost effective and scalable renewable source of energy.
  • past several years.
  • dynamic growth rate of the
  • Because of the small size of the existing installed base, the offshore wind sector will see higher growth percentages while the number of onshore turbines will continue to outpace those installed offshore.
  • Continued investment in grid infrastructure is critical for growth as well as wind turbine technology investments that improve efficiency and reliability while driving down emissions. Countries with the most efficient and flexible permitting processes will benefit by realizing the installation of the most advanced technology.
  • but renewable sources, and in large part, wind energy, have an extremely important role to play.
  • A fundamental value of wind is that it lowers risk in the overall generation mix by bringing in a fixed electricity cost. You don’t have any fuel risk, so you don’t have these big price spikes that you see when you generate electricity from gas or oil.
  • The wind power market is still intact. Demand for ‘green’ power stations remains unabated and nearly all governments have adopted policies aimed at environmental sustainability.
  • As our industry is still very young, wind power currently contributes only around 1.5% to global electricity supplies.
  • this merely serves to highlight the enormous potential for the future, especially as wind power is not only clean but also inexpensive. This is something that more and more governments and energy companies are realizing.
  • tuckeremi99 on 22 Oct 12
     
    "The growth in wind power capacity has shown no signs of slowing, even in these tough economic times. For two years running there has been more new wind power capacity installed than any other power generating technology in Europe - including coal, gas and nuclear. In 2009 the European market for wind turbines experienced a 23% growth rate, the same as the average growth rate over the last 15 years."Both in Europe and in the US, some 40% of all new power generating capacity installed in the past two years was wind energy. If the economic crisis continues, however, the reduction in power demand will start to impact wind energy, simply because of lower demand for new power plants. Nevertheless, the medium and long-term outlook remains very healthy, as political momentum is building towards a low carbon economy, without which humankind will not overcome three of the biggest concerns of our time - climate protection, energy security and the provision of jobs." "Wind power is a leader now, and will remain so in the future, attracting big investments and creating jobs. There is a boom waiting to happen in offshore wind energy. But, Europe's ageing electricity grids must be upgraded and extended, and the EU must also pursue a drive to build an offshore grid in the North and Baltic seas that will connect offshore wind farms to the shore, piping vast amounts of CO2-free energy to consumers at affordable prices."
jurektho99

Group items matching "history geothermal" in title, tags, annotations or url - qmstech2 | Diigo Groups - 0 views

groups.diigo.com/...search

shared by jurektho99 on 22 Oct 12 - No Cached
  • The word geothermal comes from the Greek words geo (earth) and therme (heat). So, geothermal energy is heat from within the Earth. We can recover this heat as steam or hot water and use it to heat buildings or generate electricity. Geothermal energy is a renewable energy source because the heat is continuously produced inside the Earth. ... Cancel
« First ‹ Previous 141 - 160 of 336 Next › Last »
Showing 20▼ items per page