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: Heat Transfer (Conduction) problem

  1. Feb 27, 2007 #1
    1. The problem statement, all variables and given/known data

    Find the amount of thermal energy that flows per day through a solid oak wall 10.0 cm thick, 3.00 m long, and 2.44 m high, if the temp of the inside wall is 21.1 C while the temp of the outside wall is -6.67 C.

    2. Relevant equations

    Q= k(A)(T2-T1)t/d

    coefficient of thermal conductivity for the oak is 1.47 x 10^-1


    3. The attempt at a solution

    This is a review question in my textbook and it shows:

    =

    (0.147 J/m s C) (24.0 m squared) (21.1 C - (-6.67 C))(24 hr)(3600 s/1 hr)
    _______________________________________________________________
    (0.100 m)




    I understand the problem and the application, I am just unsure of how to get the area, A, for these problems. ....how did the 24 m^2 come about?
     
  2. jcsd
  3. Feb 27, 2007 #2

    AlephZero

    User Avatar
    Science Advisor
    Homework Helper

    Hmm.... the question says the area is 3.00 * 2.44 = 7.32 m^2.

    I think the "24 m^2" is a typo.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook