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IBM Solar Concentrator Can Produce12kW/day, Clean Water, and AC
Lucas123 writes IBM Research and Switzerland-based Airlight Energy today announced a parabolic dish that increases the sun's radiation by 2,000 times while also producing fresh water and air conditioning. The new Concentrator PhotoVoltaics (CPV) system uses a dense array of water-cooled solar chips that can convert 80% of the sun's radiation into useful energy. The CPV, which looks like a 33-foot-high sunflower, can generate 12 kilowatts of electrical power and 20 kilowatts of heat on a sunny day — enough to power several average homes, according to Bruno Michel, the project's lead scientists at IBM Research in Switzerland.
That is so annoying every time I see it. It produces 12 kW.
The author is clearly an idiot since the article is riddled with errors in both units and facts, but most likely it produces a PEAK of 12 kW. For solar energy, it is much more useful to state both the peak and averaged power. But by far the most important information (which the article omits) is the cost per kwHr. Anyone can stick a mirror on a pole. Doing it cost effectively is harder. Without knowing the cost, there is no way to tell if this is actually useful, or just a silly stunt.
That's the first thing I saw. "generates 12KW" and the big red BS flag pops up. They do, deeper in the PR, say something about 2KWh per day electrical. But one look at this thing and I can't see how it can come close to cost of production of normal solar panels rolling off a production line, nor make up for the difference with its supposed synergistic design.
I doubt many of these ever "see the light of day". At best, some third world niche.
The article is pretty terrible on the details. It seems that this CPV device is intended to be built near the ocean, and use salt water for cooling; the water can then be run through a desalinization system.
According to Wikipedia there are several desalinization processes available that use heated water and a membrane. http://en.wikipedia.org/wiki/Desalination#Desalination_powered_by_waste_heat
The article is vague on how the CPV system provides cooling, but the CPV system produces heat as a byproduct, and it is possible to use extra heat for cooling. There are refrigerators that run on propane, with no motors. (There is a sort of pumping of coolant that relies on gravity.
There are a lot of places in the world that get lots of sunlight, are near salt water, and could use more fresh water. So this sounds like a good idea, but it isn't going to be installed everywhere.
lf(1): it's like ls(1) but sorts filenames by extension, tersely
According to the article, it's 40 square meters, and the Sun gives up a max of 1.3KW per square meter, which means it has a maximum of 52KW output at 100% and a clear sky. 80% would be about 41KWh per hour. If you assume 3 good hours, that's over 100KWH per day or $5 of $0.05/KWH energy. Almost $2k per year.
Only if you stick the gun point blank to someone's head. otherwise a .22 won't penetrate the human skull.
Don't bet your life on that.
First things first, let’s see what percentage of observed gunfights ended in a fatality for the person on the receiving end.
The graph is pretty clear on this: .22 caliber firearms are just as deadly in a gunfight as any other handgun caliber. In fact, it beat the average (far right). Surprisingly, every caliber that begins with a 4 (.40 S&W, .45, .44 Mag) performed worse than the .22 caliber firearms in terms of putting the opponent in the dirt for good.
http://www.thetruthaboutguns.c...