Week 1 - Introduction Flashcards
What is energy?
A quantity associated with the evolution of a physical system in time.
Any closed system described by a time-invariant physical system…
Has a conserved quantity called energy.
What are the stores of energy?
- Kinetic/Mechanical
- Chemical
- Gravitational Potential
- Electromagnetic
- Thermal
- Osmotic Potential
- Electrochemical
- Nuclear
Conservation of Energy Principle
Energy can neither be created nor destroyed, but only changed from one form to another.
Energy storage technologies can…
Balance short and long-term fluctuations in supply and demand.
Potential (E, Volt)
Difference in electrical potential between electrodes.
Capacity (Q, mAh/g)
Amount of electricity stored.
Gravimetric energy density (specific energy) (Wh/kg)
E x Q ; Amount of energy stored per unit weight.
Volumetric energy density (Wh/L)
E x Q ; Amount of energy stored per unit volume.
Energy (Wh ; duration of delivery)…
vs Power (W).
Depth of Discharge (DoD)
How much of the capacity is used during discharge (as a decimal).
Cycle Life
The amount of full equivalent cycles during the device’s lifetime.
Calendar Life
Capacity fade during storage.
Charge/Discharge Rate
Speed of charge/discharge.
Ragone Plots
Diagrams used to compare the amount of stored energy.
Levelised Cost of Electricity (LCOE) Method
Allows power plants with different generation cost structures to be compared with each other. The LCOE is calculated by comparing all costs incurred over the lifetime of the power plant for the construction and operation and the total amount of energy generated.
Levelised Cost of Storage (LCOS)
Used to calculate the lifetime cost of an energy storage technology over the total amount of delivered (discharged) electricity. It includes investment costs, operation and maintenance costs and charging costs.
