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Star tattoo designs foot, standing angel tattoo, star tattoo forearm, star flower tattoo, star tattoo designs on foot
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star tattoo designs foot -> star tattoo on neck |
Posted: 10 17 2009 Post subject: star tattoo knee |
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| @rizzo2008:A solar generator on the top of the roof would not be able to produce enough hydrogen to fuel even a single car; factor in the losses through the solar panels (current panels are about 18% efficient, the 41% efficient silicon PV material isn't cost effective yet), and the losses during electrolysis, etc. and you have a dismal conversion ratio.Hydrogen is extremely poor as a storage medium when it comes to energy density. It is incredibly energy dense on a MJ/kg metric, but a kilogram of hydrogen takes up a huge volume; volumetrically, hydrogen is one of the lowest density ways of storing energy.If our goal is energy independence and sustainability, renewably generated electricity is the way to go, and batteries still serve this role better than hydrogen, even though they have much lower energy density. This is because on the basis of acreage of land, solar electricity is more efficient than biofuels by far:http://www.ecogeek.org/component/content/article/1 ...http://www.ecogeek.org/biofuels/752But I agree, in the short run, nothing beats fuel in an efficient engine. |
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