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Learn about Pumped Hydroelectric Storage, Compressed Air Energy Storage, and Flywheels as efficient ways to store and balance energy. Discover their features, benefits, and comparison with traditional batteries.
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Mechanical Energy Storage Ali Shazan Gulrez A3EE56
Three Types of Storage • Pumped hydroelectric storage (PHS) • Compressed air energy storage (CAES) • Flywheels
Pumped Hydroelectric Storage (PHS) • Used for load balancing of energy • Water is pumped up in elevation during time of low demand • Water flows back down during times of high demand • Turbines recapture the energy. • Currently the most cost effective • way to store large amounts of • electricity • Low energy density calls for large • bodies of water
Compressed air energy storage (CAES) • Large tank is buried underground • During times of low demand electricity compresses air • During times of peak demand compressed air is heated and released http://www.sandia.gov/media/NewsRel/NR2001/norton.htm
Flywheels • Captures energy in a rotating Mass • Flywheel is charged using electric motor • Electric generator extracts energy
Energy held in Spinning Rotor (Steel or Carbon composite) • Steel rotors can spin at several thousand rpm • Carbon composite spin up to 60k rpm Kinetic Energy 1/2mv2
Flywheels Vs. Batteries FLYWHEELS BATTERIES • Not effected by temperature changes • No Memory Effect • Made more environmentally friendly • Easy energy content identification • Shattering due to overload • Safety devices add lots of mass • Gyroscope (duel FES systems)