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COP refrigerator vs COP Heat Pump

  1. Jan 28, 2012 #1
    1. The problem statement, all variables and given/known data
    I just want to know when do I use the formula for COP refrigerator vs COP Heat pump. If the heat is absorbing something then what formula do I use


    2. Relevant equations



    3. The attempt at a solution[/b}
    Uh I just trying 2 figure out the concept so Idk how 2 solve it lol
     
  2. jcsd
  3. Jan 28, 2012 #2
  4. Jan 28, 2012 #3

    Andrew Mason

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    Science Advisor
    Homework Helper

    If you think of COP as: output/input you will avoid confusion. If it is a heat pump, the output is the heat flow to the hot reservoir. If it is a refrigerator the output is the heat flow from the cold reservoir. The input is the work done.

    So, for a refrigerator: COP = output/input = Qc/W

    and for a heat pump: COP = output/input = Qh/W = (Qc + W)/W = Qc/W + 1

    AM
     
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