Energy & Environment I NAME

HW#5

Due Friday, November 2, 2001
  1. Summarize the efficiencies of the important heat engines.

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  2. Write the equation for the COP of a heat pump (in heating mode).

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    The COP of a heat pump (in heating mode) is 2.0. What is the efficiency of this heat pump when it is switched to air conditioning mode?

     

     

     

     

  3. Give the percentages of residential energy used for:

    4. Heating and air conditioning:

    Water heating:

    Lighting:

    Refrigerators:

    Cooking:

    Other appliances:

  4. Define lumen:

 

 

 

 

 

 

 

 

 

 

For incandescent lighting, what percentage of the input electrical energy is converted to the energy of the visible light?