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Using Energy Efficiently

Energy & Transformations. Using Energy Efficiently. Efficiency of Technologies. Using new energy-efficient technologies are crucial to our future. Fossil fuels are depleting causing increased costs.

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Using Energy Efficiently

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  1. Energy & Transformations Using Energy Efficiently

  2. Efficiency of Technologies • Using new energy-efficient technologies are crucial to our future. • Fossil fuels are depleting causing increased costs. • Typically more expensive up-front, their maintenance costs and lifetime are typically longer than less-efficient technologies.

  3. Efficiencies of Technologies

  4. Efficiencies of Technologies

  5. Gasoline Automobile Mechanical Energy

  6. Electric Automobile 7x More efficient than Gasoline!!

  7. Overall Efficiency • As seen in the automobile diagrams, every energy transformation results in energy losses. • Most processes involve more than one energy transformation which requires the calculation of overall efficiency.

  8. Example #1 • Running an electric hair dryer on hydroelectricity in Ontario has the following efficiencies: • 95% efficient energy generation • 95% efficient hair dryer • Draw an energy flow diagram for the situation. • Calculate the total efficiency of the hair dryer.

  9. Example #2 • A gasoline driven car has the following efficiencies: • 97% efficient oil extraction process • Oil refined to gasoline with 95% efficiency • Transportation of gasoline with 94% efficiency • Engine is 24% efficient • Transmission is 76% efficient • Draw the energy flow diagram. • What is the overall efficiency of the car?

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