Revise: Sources of Energy and Environmental Impacts
The energy crisis, renewable and non-renewable energy sources, and the environmental consequences of how we generate energy.
D = Dβ(1+r)α΅ β energy demand compounds like interest.
Dβ=500MW, r=5%, t=10 β Dβ814.4MW.
Renewable/non-renewable and primary/secondary are two separate axes.
Electricity from coal: secondary, sourced from a non-renewable.
E = mq β total energy from mass Γ calorific value.
2kg coal, q=30MJ/kg β E=60MJ.
P = Β½ΟAvΒ³ β wind power grows with the CUBE of speed.
r=20m, v=10m/s β Pβ754kW.
Growth by a constant PERCENTAGE, not a constant amount.
Used to plan new generating capacity years ahead.
"Renewable" describes replenishment speed, not cleanliness.
Burning wood is renewable but still has environmental impact.
Different fuels have very different calorific values.
Coal, oil, and natural gas each have their own q.
Site selection matters enormously because of the cubic v term.
Doubling wind speed multiplies power by 8Γ.
Emission factor differs by fuel type.
National carbon footprints sum this across every fuel used.