Efficiency, Cogeneration and Energy Conservation 5/08.

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Presentation transcript:

Efficiency, Cogeneration and Energy Conservation 5/08

The First Law of thermodynamics The energy going in must equal the energy leaving When energy is transferred heat is wasted energy

Energy Efficiency is the percentage of energy that does useful work

Calculation % efficiency = useful energy out / useful energy in multiplied by 100 More than 40% of all commercial energy in the US is wasted

Hybrid cars Small efficient gasoline engine Electric motor when needed Convert braking energy to electricity Turn off when idling Lightweight and aerodynamic

Cogeneration Production of two useful forms of energy from one source

Energy Conservation Mostly common sense, that for a little effort will save lots of money