Don't blame Afridi
0 Comments - 20 Jul 2010
       Shahid Afridi trains on the eve of the Asia Cup, Dambulla, June 14, 2010 Afridi's resignation and Butt's promotion could actually be good for Pakistan cricket © AFP Related Links News : Salman Butt named captain for rest of England tour News : Shahid Afridi to retire from Tests Players/Officials: Salman Butt | Shahi...

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Afridi aims for World Cup glory
0 Comments - 20 Jul 2010
       Shahid Afridi called the shots in the field for Pakistan, including a fine catch at mid-on, Australia v Pakistan, 1st Twenty20, Edgbaston, July 5, 2010 Shahid Afridi wants to concentrate on repeating Pakistan's 1992 heroics © Getty Images Related Links News : Salman Butt named captain for rest of England tour News :...

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Friday, May 14, 2010

Active solar

Active solar technologies are employed to convert solar energy into usable light, heat, cause air-movement for ventilation or cooling, or store heat for future use. Active solar uses electrical or mechanical equipment, such as pumps and fans, to increase the usable heat in a system. Solar energy collection and utilization systems that do not use external energy, like a solar chimney, are classified as passive solar technologies.

Solar hot water systems, except those based on the thermosiphon, use pumps or fans to circulate water, an anti-freeze mixture, or air through solar collectors, and are therefore classified under active solar technology. The solar collectors can be nonconcentrating or 'flat-plate', or of various concentrating designs. Most solar-thermal collectors have fixed mounting, but can have a higher performance if they track the path of the sun through the sky. Solar trackers, used to orient photovoltaic arrays or daylighting, may be driven by either passive or active technology.

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