Mechanical Energy Storage Ali Shazan Gulrez A 3
- Slides: 7
Mechanical Energy Storage Ali Shazan Gulrez A 3 EE 56
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/News. Rel/NR 2001/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 60 k rpm Kinetic Energy 1/2 mv 2
Flywheels Vs. Batteries FLYWHEELS BATTERIES Not effected by Shattering due to overload temperature changes No Memory Effect Made more environmentally friendly Easy energy content identification Safety devices add lots of mass Gyroscope (duel FES systems)
