Bahrain World Trade Center | Popular Science: "The first skyscraper to integrate large-scale wind turbines suspends three 1,200-megawatt units between its matching 787-foot office towers. The turbines, which were completed in April, supply 15 percent of the electricity for the two buildings—roughly the same amount used by 300 homes.
To maximize energy output, the tapered towers funnel wind between them, creating a negative pressure zone behind the buildings that draws more air through the gap. This suction effect increases wind speeds by up to 30 percent at each of the 95-foot-long rotors to boost electricity production. It also redirects wind gusts hitting the tower by up to 45 degrees off center so that they hit the turbines at a nearly perpendicular angle for optimal electricity generation."
Monday, November 24, 2008
Is ‘Greenery’ Only for the Good Times? - Green Inc. Blog - NYTimes.com
Is ‘Greenery’ Only for the Good Times? - Green Inc. Blog - NYTimes.com: "The credit crunch also is expected to interrupt the cycle of investment that had been underway in lower carbon forms of energy, including projects for renewable energy and new nuclear reactors. Analysts now are warning that the lack of new, lower carbon generation capacities now will trigger higher CO2 emissions in the future — certainly higher than would have been the case without the current turmoil."
Saturday, November 22, 2008
Friday, November 7, 2008
Measuring for Solar Panels with Satellite Photos
Three Simple Start-Ups Hoping to Change the World - Bits Blog - NYTimes.com: "Buying solar panels for your house takes a lot of time and effort. The installer has to visit your home, often more than once, to measure and fit the panels to your roof, all just to give you a quote. When you visit Sungevity’s Web site and enter your address, it uses satellite and aerial imagery to measure your roof and delivers a quote within 24 hours, often in 15 minutes, said Danny Kennedy, its co-founder and president. It charges 10 percent less than most installers, saving the consumer money and time."
Wednesday, November 5, 2008
Saturday, November 1, 2008
A Thin Film Solar Installation Revisited : CleanTechnica
A Thin Film Solar Installation Revisited : CleanTechnica: "If Magco earns $9,000/year, they’ll regain their investment in almost 24 years. That’s about US$43.88 per square foot on this installation. If you only calculate the installation cost and optimal energy production, the price per watt comes out around $8/watt.
Keep in mind that these are pre-rebate figures. State and national renewable energy programs can go a long way towards reducing these costs. Maryland does have a solar energy rebate program. More on that as the information becomes available."
Keep in mind that these are pre-rebate figures. State and national renewable energy programs can go a long way towards reducing these costs. Maryland does have a solar energy rebate program. More on that as the information becomes available."
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