Energy Efficiency = changing current devices so they

1) do more useful work 2) not converting into low-quality(heat)84% of all commercial 84% of all commercial

energy used is wastedenergy used is wasted

~40% through entropy

~40% by inefficient methodology

•Reduces dependency on oil imports

•Lowers cost/increases net energy yields

•Reduces pollution by reducing emissions of NOx, SO2, CO2

BENEFITS?

% of total energy that does useful work

Common Inefficient Devices:

Incandescent Bulbs

Combustion Engines

•80-90% of our energy comes from fossil fuels

•Oil age rapidly changing to less damaging fuel sources

•Fossil fuels have: Political support & solid infrastructureAlternative Energy –

1) Renewable Energy – solar, wind, hydropower, biomass**

2) Non-renewable Energy – nuclear & geothermal

3-5% = hydropower

7-10% = nuclear power

US Consumption

Fuel Cell = 60%Fuel Cell = 60%

Fluorescent Lt = 22%Fluorescent Lt = 22%

Incandescent Lt = 5%Incandescent Lt = 5%

Steam Turbine = 45%Steam Turbine = 45%

Internal Comb. Eng. = 5-10%Internal Comb. Eng. = 5-10%

Nuclear Power = 14%Nuclear Power = 14%

Coal burning PP = 34%Coal burning PP = 34%

Keep # of steps in energy conversion low

INSULATION!

Congeneration (industry)- using waste heat

(80% efficient, reduce emissions of CO2)

Replace inefficient motors

Switching to high efficient lighting