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DOE Flywheel Energy Storage Part I: Uninterruptible Power Supply Systems (1 credit hours/1 HSW Hours)
In a flywheel, energy is stored by causing a disk or rotor to spin on its axis.  Advances in power electronics, magnetic bearings, and flywheel materials coupled with innovative integration of components have resulted in direct-current flywheel energy-storage systems that can be used as a substitute or supplement to batteries in uninterruptible power supply (UPS) systems.  
Although generally more expensive than batteries in terms of first cost, the longer life, simpler maintenance, and smaller footprint of the flywheel systems makes them attractive battery alternatives. 
 
This 1 hour course describes flywheel technology, its variations, and installation requirements.  Next a description is given of the market for flywheels, advice for choosing appropriate applications, and descriptions of the experiences of several users.  One application is highlighted as a case study, followed by an illustrative life-cycle cost comparison of batteries and flywheels.
' US Department of Energy
  • Students will learn that flywheels have potential use anywhere batteries are currently used in UPS systems.
  • Students will know the advantages flywheels have compared to batteries.
  • Students will understand the difference in cost and operating characteristics between low speed and high speed flywheels.
  • Students will know about flywheels’ improved UPS system reliability and reduced life-cycle costs compared to batteries.
  • Students will be familiar with examples of successful flywheels currently in use

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