Environment Technology

Environment Technology

Donald Sadoway: The missing link to renewable energy

Posted by admin on April 28, 2012 in Renewable Energy with 25 Comments


http://www.ted.com What’s the key to using alternative energy, like solar and wind? Storage — so we can have power on tap even when the sun’s not out and the wind’s not blowing. In this accessible, inspiring talk, Donald Sadoway takes to the blackboard to show us the future of large-scale batteries that store Renewable Energy. As he says: “We need to think about the problem differently. We need to think big. We need to think cheap.”

TEDTalks is a daily video podcast of the best talks and performances from the TED Conference, where the world’s leading thinkers and doers give the talk of their lives in 18 minutes. Featured speakers have included Al Gore on climate change, Philippe Starck on design, Jill Bolte Taylor on observing her own stroke, Nicholas Negroponte on One Laptop per Child, Jane Goodall on chimpanzees, Bill Gates on malaria and mosquitoes, Pattie Maes on the “Sixth Sense” wearable tech, and “Lost” producer JJ Abrams on the allure of mystery. TED stands for Technology, Entertainment, Design, and TEDTalks cover these topics as well as science, business, development and the arts. Closed captions and translated subtitles in a variety of languages are now available on TED.com, at http://www.ted.com/translate

If you have questions or comments about this or other TED videos, please go to http://support.ted.com

Duration : 0:15:16

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Global Warning

Posted by admin on April 28, 2012 in Global Warming with 24 Comments


Video on Global Warming
Narrated by Leonardo Dicaprio

Duration : 0:4:43

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Environment Protection

Posted by admin on April 28, 2012 in Environment Protection with 3 Comments


Video of Environment Guards

Duration : 0:7:25

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Clean Energy in Britain — a win for UK and global business

Posted by admin on April 28, 2012 in Clean Energy with 2 Comments


The UK is shifting to a low carbon economy, and the resultant opportunities, for UK businesses and overseas investors to the UK, are vast. Ed Davey, Minister for Energy and Climate Change, and Lord Green, Minister for Trade & Investment are featured in this video, along with major players in British Clean Energy, including inward investors. Produced for the Clean Energy Ministerial, London, April 25 – 26 2012.

Duration : 0:4:50

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renewable energy?

Posted by admin on April 28, 2012 in Renewable Energy with 3 Comments


ok, so I’m preparing a speech on Renewable Energy. Primarily solar energy. . . . can anyone give me some facts and figures to incorporate, perhaps some angles I havn’t thought of yet? I plan on appealing to the emotional side of saving the environment and the logical side of saving money on your monthly energy bill (it’s to be a persuasive speech) . . . so perhaps the efficiency rating of solar panels, or that average energy produced by wind? or even better if someone has some figures on the california rebates given for solar panel installation. Thanks for the assistance 😀

Solar Cell – Renewable and Cleanest Energy Source:

Solar cell is a semiconductor device that converts the energy of sunlight into electric energy. These are also called ‘photovoltaic cell’. Solar cells do not use chemical reactions to produce electric power, and they have no moving parts.

Photovoltaic solar cells are thin silicon disks that convert sunlight into electricity. These disks act as energy sources for a wide variety of uses, including: calculators and other small devices; telecommunications; rooftop panels on individual houses; and for lighting, pumping, and medical refrigeration for villages in developing countries. In large arrays, which may contain many thousands of individual cells, they can function as central electric power stations analogous to nuclear, coal-, or oil-fired power plants. Arrays of solar cells are also used to power satellites; because they have no moving parts that could require service or fuels that would require replenishment, solar cells are ideal for providing power in space.

A. Most photovoltaic cells consist of a semiconductor pn junction, in which electron-hole pairs produced by absorbed radiation are separated by the internal electric field in the junction to generate a current, a voltage, or both, at the device terminals. Under open-circuit conditions (current I = 0) the terminal voltage increases with increasing light intensity, and under short-circuit conditions (voltage V = 0) the magnitude of the current increases with increasing light intensity. When the current is negative and the voltage is positive, the photovoltaic cell delivers power to the external circuit.

B. Characteristics of a Solar Cell – The usable voltage from solar cells depend on the semiconductor material. In silicon it amounts to approximately 0.5 V. Terminal voltages is only weakly dependent on light radiation, while the current intensity increases with higher luminosity. A 100 cm² silicon cell, for example, reaches a maximum current intensity of approximately 2 A when radiated by 1000 W/m². The output (product of electricity and voltage) of a solar cell is temperature dependent. Higher cell temperatures lead to lower output, and hence to lower efficiency. The level of efficiency indicates how much of the radiated quantity of light is converted into useable electrical energy.

C. Cell Types: One can distinguish three cell types according to the type of crystal: monocrystalline, polycrystalline and amorphous. To produce a monocrystalline silicon cell, absolutely pure semiconducting material is necessary. Monocrystalline rods are extracted from melted silicon and then sawed into thin plates. This production process guarantees a relatively high level of efficiency.

The production of polycrystalline cells is more cost-efficient. In this process, liquid silicon is poured into blocks that are subsequently sawed into plates. During solidification of the material, crystal structures of varying sizes are formed, at whose borders defects emerge. As a result of this crystal defect, the solar cell is less efficient.
If a silicon film is deposited on glass or another substrate material, this is a so-called amorphous or thin layer cell. The layer thickness amounts to less than 1µm (thickness of a human hair: 50-100 µm), so the production costs are lower due to the low material costs. However, the efficiency of amorphous cells is much lower than that of the other two cell types. Because of this, they are primarily used in low power equipment (watches, pocket calculators) or as facade elements.

D. Efficiency: Solar cell efficiencies vary from 6% for amorphous silicon-based solar cells to 42.8% with multiple-junction research lab cells. Solar cell energy conversion efficiencies for commercially available multicrystalline Si solar cells are around 14-16%. The highest efficiency cells have not always been the most economical — for example a 30% efficient multijunction cell based on exotic materials such as gallium arsenide or indium selenide and produced in low volume might well cost one hundred times as much as an 8% efficient amorphous silicon cell in mass production, while only delivering about four times the electrical power.
To make practical use of the solar-generated energy, the electricity is most often fed into the electricity grid using inverters (grid-connected PV systems); in stand alone systems, batteries are used to store the energy that is not needed immediately.

E. Advantages of solar energy: Solar cells are long lasting sources of energy which can be used almost anywhere. They are particularly useful where there is no national grid and also where there are no people such as remote site water pumping or in space. Solar cells provide cost effective solutions to energy problems in places where there is no mains electricity. Solar cells are also totally silent and non-polluting. As they have no moving parts they require little maintenance and have a long lifetime. Compared to other renewable sources they also possess many advantages; wind and water power rely on turbines which are noisy, expensive and liable to breaking down.

Rooftop power is a good way of supplying energy to a growing community. More cells can be added to homes and businesses as the community grows so that energy generation is in line with demand. Many large scale systems currently end up over generating to ensure that everyone has enough. Solar cells can also be installed in a distributed fashion, i.e. they don’t need large scale installations. Solar cells can easily be installed on roofs, which mean no new space is needed and each user can quietly generate their own energy.

F. Disadvantages of solar cells: The main disadvantage of solar energy is the initial cost. Most types of solar cell require large areas of land to achieve average efficiency. Air pollution and weather can also have a large effect on the efficiency of the cells. The silicon used is also very expensive and the problem of nocturnal down times means solar cells can only ever generate during the daytime. Solar energy is currently thought to cost about twice as much as traditional sources (coal, oil etc). Obviously, as fossil fuel reserves become depleted, their cost will rise until a point is reached where solar cells become an economically viable source of energy. When this occurs, massive investment will be able to further increase their efficiency and lower their cost.

For further information please refer
http://www.environmentengineering.blogspot.com

Global warming?

Posted by admin on April 28, 2012 in Global Warming with 7 Comments


Global warming is viewed as a real problem. Many believe that the switch has already flipped. I don’t know, but maybe the solution lies not only in measures to reduce the output of green house gases but in active measures to reduce the amount of green house gases in the atmosphere.

Global warming describes an increase over time of the average global temperature at the surface of the Earth, which has risen by 0.6 ± 0.2°C since the late 19th century. Global warming theories attempt to account for the rise and assess the extent to which the effects are due to human causes. Most of the warming of the last 50 years is attributed to increases in the greenhouse effect caused by human-generated carbon dioxide (CO2); solar variability and other natural causes also play a role.

Climate models predict that temperatures will increase (with a range of 1.4°C to 5.8°C for change between 1990 and 2100). Much of this uncertainty results from not knowing future CO2 emissions, but there is also uncertainty about the accuracy of climate models. Climate commitment studies predict that even if levels of greenhouse gases and solar activity were to remain constant, the global climate is committed to 0.5°C of warming over the next one hundred years due to the lag in warming caused by the oceans.

Although the discussion of global warming often focuses on temperature, Global Warming or any climate change may cause changes in other things as well, including the sea level, precipitation, weather patterns, etc. These may affect human activity via floods, droughts, heat waves, changes to agricultural yields, etc

What do you think of the new Environment Protection tax in the USA, which will increase the price of gas?

Posted by admin on April 28, 2012 in Environment Protection with 3 Comments


I wondered what people think of that new Environment Protection bill, that has just been through Congress and will include an additional tax to provide for measures against pollution and to develop new research projects for alternative energies. In my view, it’s basically a good thing, but it seems a bit strange that they would do it so shortly before the elections.

About time some of the money we pay for gas goes to a good end and not into the pockets of the marketers and producers. Face it people we have to pony up and do this ourselves, government is delusional about alterntive energies.

How can we overcome the influence of Big Oil and move to clean energy?

Posted by admin on April 28, 2012 in Clean Energy with 6 Comments


I notice that Bil Oil is already big time attacking the suggestions of Gore that we move to Clean Energy sources within 10 years.
Of course the oil companies have puppet strings on congress, etc.
So are we ever going to be able to move to cheaper cleaner energy sources? Are car manufacturers controlled by big oil also?
Is there any way to fight the big oil companies and move on to cleaner energy sources?

There is really no Big Oil…just big consumers.

When you give your car away, and opt for an electric car…unplug everything you own and go totally solar..then you are ready to move to clean sources.

But as long as we consume, they will produce.

Renewable Energy

Posted by admin on April 24, 2012 in Renewable Energy with 25 Comments


A short video that I made for science when I was In Year 10, Hope you enjoy :)

Thanks so much to those who have watched this video, which has reached over 67,000 views!

Duration : 0:3:26

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The Most Terrifying Video You’ll Ever See

Posted by admin on April 24, 2012 in Global Warming with 24 Comments


Over 8 million total views. Now there’s a book:
“…superbly crafted…A must read.” -Gen. Anthony Zinni, US CENTCOM Commander (Ret.)

“This book trumps most of our accounts of the Global Warming crisis.” –author Bill McKibben

“Al Gore should share his Nobel peace prize.” -The “New Scientist”

“This is a tremendous book and well worth anyone’s time to read…. You’re in for a treat—Craven is funny as well as exceptionally clear, and wise.” –Kim Stanley Robinson, Hugo and Nebula Award-winning author of the Mars Trilogy and Science in the Capital

“This is a terrifically thoughtful book…. Cravens book shines an illuminating floodlight on how we think about global warming.”
–Ross Gelbspan, author, “The Heat Is On” and “Boiling Point”

On Amazon: http://snurl.com/kjpvp

Greg Craven (that’s me!), the creator of “The Most Terrifying Video” never intended to write a book. It just sort of happened. All as a result of the two-year back-and forth I’ve had with the YouTube community about this video and its follow up marathon “How It All Ends.”

So now “What’s the Worst That Could Happen? A Rational Response to the Climate Change Debate” is available from Amazon and other sellers through the links at www.gregcraven.org, as well as your local bookstore (I hope!).

Check it out if you’re intrigued by the argument in this video.

On Amazon: http://snurl.com/kjpvp

Trailer for the book: http://www.youtube.com/watch?v=7e10ZNpogv4

What the critics are saying: http://www.gregcraven.org/en/the-book/endorsements-and-criticisms

Download a 25-page preview: http://www.gregcraven.org/en/the-book/download-preview-of-whats-the-worst-that-could-happen

In the press: http://www.gregcraven.org/en/the-book/press-coverage-for-the-book
———-

THE REASON THE COMMENTS ARE CLOSED ON THIS VIDEO is that most of the criticisms of what’s presented here have been addressed by the bruisingly thorough 7-hour How It All Ends video project, the discussion is happening over there. I spent months combing through literally tens of thousands of critical comments to find every single objection, criticism, “Yeah but,” and “You missed a spot” that I could to this video.

You might find the results interesting, and hopefully, helpful: http://www.youtube.com/view_play_list?p=92EE5DBE2987982F

You can post comments there. But to tell the truth, the conversation has moved even farther along, since the criticisms to those videos gave rise to the book, which now has its own discussions going at http://www.manpollo.org/forums/index.php.

Duration : 0:9:33

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