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Flywheel energy storage uses rotational inertia to store and release kinetic energy. It's used for power smoothing and peak shaving.
Formel
Power = dE/dt (rate of energy change)
Trin-for-trin guide
- 1Calculate: E = 0.5 × I × ω² where I is moment of inertia, ω is angular velocity
- 2Energy stored = change in kinetic energy
- 3Power = dE/dt (rate of energy change)
Løste eksempler
Input
Flywheel I=100 kg·m², ω=500 rad/s
Resultat
E = 0.5 × 100 × 500² ≈ 12.5 MJ energy stored
Significant storage capacity
Almindelige fejl at undgå
- ✕Neglecting bearings friction losses
- ✕Over-sizing flywheel (excessive cost and weight)
Ofte stillede spørgsmål
Why use flywheels over batteries?
Flywheels handle high power (charge/discharge rate); good for short-duration storage.
What limits flywheel speed?
Material strength; excessive speed causes material failure. Typically limited to 20-60% ultimate stress.
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