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Wednesday, 9 January 2013

APPLE STUDIES THERMAL STORAGE FOR iTURBINE WIND

Posted on 05:34 by Unknown
Apple's wind turbine technology uses heat, not rotational energy to generate electricity

Mikey Campbell, December 27, 2012 (Apple Insider)

“In a rare non-computing related patent filing…Apple proposes a wind turbine that generates electricity from converting heat energy rather than rotational energy created by the rotation of the unit's blades…[A]n application published by the U.S. Patent and Trademark Office for the "On-demand generation of electricity from stored wind energy," [described] an invention wholly dedicated to solving problems of variability associated with the alternative energy production method.

“The application, filed for in June 2011, notes that most contemporary wind turbines convert kinetic energy from wind into mechanical energy, or in some cases electricity…[W]ind energy is…converted into rotational energy through a drive shaft, which then powers machinery or, more recently, electric generators…[To mitigate wind’s variability] the filing proposes a system that converts rotational energy from the turbine into heat, which is then stored in a ‘low-heat-capacity’ fluid. From storage, heat can be selectively transferred to a ‘working fluid’ that is used to generate electricity during lulls in wind activity.”

click to enlarge

“In some embodiments, heat is generated from the friction created between blades connected to the rotor shaft and the low-heat-capacity fluid, such as mercury, ethanol or an inert gas, in which they are immersed. Thermal energy is stored in an insulated vessel. A thermally insulating component like a radiator or conductive rod can be used to selectively transfer heat from the low-heat-capacity fluid…[to boil water to create steam] which rotates a turbine connected to an electric generator.

“According to the patent application, the ‘on-demand’ electric generation system can reduce costs associated with natural variations in wind supply. Further, the method can be used as a replacement for current conventional energy storage methods such as batteries…Whether Apple plans to deploy such a wind turbine system is unclear, but [it] is investing heavily in alternative energy sources…”

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