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Conductive heat transfer through basement wall

  1. Dec 10, 2012 #1
    1. The problem statement, all variables and given/known data

    In an electrically heated home, the temperature of the ground in contact with a concrete basement wall is 13.8oC. The temperature at the inside surface of the wall is 20.8oC. The wall is 0.118m thick and has an area of 9.43m2. Assume one kilowatt*hour of electrical energy costs $0.10. How many hours are required for one dollar's worth of energy to be conducted through the wall?

    2. Relevant equations
    q=KAdeltaT/L


    3. The attempt at a solution (1.7)*(9.43)*(20.8-13.8)/0.118=950.99 W $1=10000Whr
    10000/950.99=1052 hrs....not working though???
     
  2. jcsd
  3. Dec 10, 2012 #2
    Where did you find your k value? And is it in the correct units?

    -Mark

    PS: You did mean to write 10.52 hrs I hope?
     
  4. Dec 10, 2012 #3
    yes i mean to write that, I got 1.7 from online source, but someone else also used 1.5 but neither of those works?
     
  5. Dec 10, 2012 #4
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