1. Mechanical Energy Storage
Ali Shazan Gulrez
A3EE56

2. Three Types of Storage Pumped hydroelectric storage (PHS)
Compressed air energy storage (CAES)
Flywheels

3. 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

4. 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

5. Flywheels Captures energy in a rotating Mass
Flywheel is charged using electric motor
Electric generator extracts energy

6. 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

7. 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)