Energy Storage Flashcards
(11 cards)
What is the primary function of battery storage?
Stores chemical energy, converts to electricity
Battery storage has a limited life span and may have environmental impacts.
What is a significant limitation of battery storage?
Limited life span
This affects the long-term viability of battery storage systems.
What does the term ‘energy density’ refer to?
How much energy stored per unit of mass
Energy density is a crucial parameter in evaluating energy storage systems.
Describe the basic principle of a flywheel energy storage system.
Rim discs attached to a shaft that spins continuously to store mechanical energy
Energy is extracted via a generator.
How does the speed of a flywheel affect the energy stored?
Faster spins = more energy stored
Energy loss due to friction can occur.
What happens to the energy density of a flywheel if the material density increases?
The energy density of the flywheel will decrease
This reduces the maximum energy stored.
What type of materials are preferable for energy storage in flywheels?
Lighter materials with high tensile strength
They store more energy effectively.
What is the basic working principle of pumped storage?
Water pumped to high reservoir (potential energy), released downhill through turbines to generate electricity
This method is known for its large-scale energy storage capabilities.
True or False: Pumped storage involves the use of batteries to store energy.
False
Pumped storage uses water and gravity rather than batteries.
What is a disadvantage of using flywheel energy storage?
Energy loss due to friction
This can reduce the efficiency of the energy storage system.
calculate the energy density of a material
density = 7800 kgm^-3
tensile stress = 1000 x 10^6 Nm^-2
K = 1
Wmax = K o(max) / 4 x p
ans = 32.05 kJ/m^3
