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A refrigerator in a hospital removes 40 kW of heat from a sp

  1. Sep 23, 2015 #1
    • Thread moved from technical Engineering forums, so no HH Template is shown
    A refrigerator in a hospital removes 40 kW of heat from a space used for blood storage. The coefficient of performance of the refrigerator is 8. What is the work (kJ) required to operate the refrigerator continuously for one day?

    What I attempted to do:

    W in = Qin/COP therefore, Win = 40kW(24hr)/8 = 120 kJ

    but that is wrong..
     
  2. jcsd
  3. Sep 23, 2015 #2

    billy_joule

    User Avatar
    Science Advisor

    You have a unit error:

    (kW)*(Hr) ≠ kJ

    A conversion factor on the LHS is required..
     
  4. Sep 23, 2015 #3
    ahh i got it! thanks!
     
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