2012年3月25日 星期日

Apple's Solar Farm: Stewardship or Marketing?

Solar power offers an enticing alternative to traditional energy sources, especially for an industry that is becoming increasingly notorious for its huge and growing power appetite. Apple's Maiden, North Carolina, data center will be powered in part by a huge solar array, but is this solar energy project showing a glimpse of a solar-powered future,See our full range of Flying lanterns, Paper lanterns, skylanternsled, Chinese lanterns, Floating lanterns, Hanging Paper lanterns, Chinese sky ... or is it just a marketing tactic for the computer giant?

According to DatacenterDynamics ("Apple confirms solar farm at Maiden data center"), Apple's Maiden campus will include a 100-acre solar array with a peak output of 20MW, producing about 42 million kWh per year.Browse through our impressive range of goodleddownlight and buy online now. Doing a little math, the yearly output translates to an average output of a little less than 5MW. (If you double that to very roughly account for nighttime hours, the array will provide an average of between 9MW and 10MW during daylight hours.)

According to the U.K.'s Register ("Apple slaps mega-solar panel field on new ENORMO data centre"), the Maiden data center will consume on the order of 50MW to 60MW; some wilder estimates even put it as high as 100MW. In either event, the solar array—as huge as it is—will only cover a maximum of about 10% of this consumption.Lean and luminous, these detachable cflbulbs withstand all weather conditions and pop with color.

Nevertheless, even though the solar array accounts for a relatively small percentage of the facility's expected power needs, it is still significant and will no doubt provide some insight into the feasibility of the sun as a practical large-scale energy source.

Apple's addition of the solar array in North Carolina no doubt scores it some marketing points by enabling it to boast of concern for the environment—and there's no reason to think the company wants to "destroy the planet." But ultimately, making money is what drives business, so Apple is no doubt exploring the potential of solar power as a means of lowering its energy costs. After all, sunlight is free. The infrastructure has an associated cost, as well as maintenance expenses, but the investment offers significant potential returns in the long term.

Let's do some more math. Electromagnetic solar radiation (all frequencies, including visible light) constitutes about 1,350 watts per square meter—the solar constant. This number simply means that if you held up a solar panel that is one square meter in area, you could theoretically get 1350 watts of power—enough to power about thirteen 100-watt light bulbs.

But this number is the solar incidence just outside the atmosphere; what's received at ground level is less,Bellacor offers a large selection of bikelight111 for your yard or patio. owing to losses as the radiation propagates through air (these losses include scattering, such as off clouds, as well as absorption/heating). Atmospheric factors affecting the solar constant are manifold, but let's assume about a 25% average loss, bringing the potential power to about 1,Online shopping from the largest selection of goodcflbulbsgg Products.000 watts per square meter.

To account for nighttime hours, cut that power number in half (and that's being generous): 500 watts per square meter. Now, assume a solar cell can turn half of what it receives into usable power: we're now down to 250 watts per square meter. Thus, a solar panel measuring one meter by one meter (about 10 square feet) would—assuming 12 hours of full daylight and a system to ensure the panel is always directed toward the sun—provide enough power to on average run two or three light bulbs continuously. Not bad, but not great.

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