Very cheap solar power
in [Physics]
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From: jimp on 10 Feb 2010 20:58 In sci.physics habshi(a)anony.net wrote: > Wind and solar technology made up over half of Europe?s new > electricity generating capacity in 2009, as the number of new coal and > nuclear facilities fell > More wind capacity was installed in Europe during 2009 than any other > electricity-generating technology, according to statistics released > today by the European Wind Energy Association (EWEA). > > Wind accounted for 39 per cent of increased European energy capacity, > ahead of gas (26 per cent) and solar (16 per cent). In contrast, the > nuclear and coal power sectors decommissioned more megawatts of > capacity than they installed in 2009, with a total of 1,393 MW of > nuclear and 3,200 MW of coal decommissioned. "Deputy chairman of Russia's Gazprom argues plans for renewable energy are irrational and should be replaced by more gas-fired power stations" http://www.guardian.co.uk/business/2010/feb/09/scrap-windfarms-says-gazprom -- Jim Pennino Remove .spam.sux to reply.
From: Matt on 14 Feb 2010 00:44 On Sat, 6 Feb 2010 02:19:40 -0000, jimp(a)specsol.spam.sux.com wrote: >You are still an idiot. The "idiot" proclamations are Uncle Al-ish and wear thin quickly. http://www.biblegateway.com/passage/?search=Psalm%201:1-3&version=NIV Blessed is the man who does not ... sit in the seat of mockers. Al is not a role model for conversational style. He comes across as a misanthrope. Brilliant and often informative; but a misanthrope, nonetheless.
From: jimp on 14 Feb 2010 12:15 Matt <30days(a)net.net> wrote: > On Sat, 6 Feb 2010 02:19:40 -0000, jimp(a)specsol.spam.sux.com wrote: > >>You are still an idiot. > > The "idiot" proclamations are Uncle Al-ish and wear thin quickly. > > http://www.biblegateway.com/passage/?search=Psalm%201:1-3&version=NIV > Blessed is the man who does not ... sit in the seat of mockers. > > Al is not a role model for conversational style. He comes across as a > misanthrope. Brilliant and often informative; but a misanthrope, > nonetheless. Al comes across as intelligent, educated, and with a very thin skin when it comes to fools and babbling cretins. -- Jim Pennino Remove .spam.sux to reply.
From: habshi on 18 Feb 2010 07:41 What happens when you put iron chains in water in sunlight? Would the iron absorb the heat and keep the swimming pool warm at night , so that it heats up faster during the day? excerpt http://www.sciencedaily.com/releases/2010/02/100216140259.htm The silicon-wire arrays absorb up to 96 percent of incident sunlight at a single wavelength and 85 percent of total collectible sunlight. "We've surpassed previous optical microstructures developed to trap light," he says. Atwater and his colleagues -- including Nathan Lewis, the George L. Argyros Professor and professor of chemistry at Caltech, and graduate student Michael Kelzenberg -- assessed the performance of these arrays in a paper appearing in the February 14 advance online edition of the journal Nature Materials. Atwater notes that the solar cells' enhanced absorption is "useful absorption." "Many materials can absorb light quite well but not generate electricity -- like, for instance, black paint," he explains. "What's most important in a solar cell is whether that absorption leads to the creation of charge carriers." The silicon wire arrays created by Atwater and his colleagues are able to convert between 90 and 100 percent of the photons they absorb into electrons -- in technical terms, the wires have a near-perfect internal quantum efficiency. "High absorption plus good conversion makes for a high-quality solar cell," says Atwater. "It's an important advance." The key to the success of these solar cells is their silicon wires, each of which, says Atwater, "is independently a high-efficiency, high-quality solar cell." When brought together in an array, however, they're even more effective, because they interact to increase the cell's ability to absorb light. "Light comes into each wire, and a portion is absorbed and another portion scatters. The collective scattering interactions between the wires makes the array very absorbing," he says. This effect occurs despite the sparseness of the wires in the array -- they cover only between 2 and 10 percent of the cell's surface area.
From: jimp on 18 Feb 2010 12:12
In sci.physics habshi(a)anony.net wrote: > What happens when you put iron chains in water in sunlight? They rust away. > Would the iron absorb the heat and keep the swimming pool warm at > night , so that it heats up faster during the day? No, but painting the pool walls to absorb heat during the day and closing the pool with a cover at night to reduce evaporative cooling does, both of which have been around for at least a half century. You are still an idiot. -- Jim Pennino Remove .spam.sux to reply. |