1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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

    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?


    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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook