Mechanical Energy Storage

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Presentation transcript:

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 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)