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Homework Help: Thermal Conductivity

  1. Apr 13, 2010 #1
    1. The problem statement, all variables and given/known data

    A wall is insulated with glass wool of thermal conductivity K = 0.046 W/m oC. What is the rate of heat loss (in W) through an area 1.0 m wide by 1.5 m high, insulated with a layer of glass wool 20 cm (.2 m) thick, if the temperature difference across the layer is 20.0 oC?

    2. Relevant equations

    I think I'm just doing something wrong algebraically. I'm using Q/deltaT = KA * delta T/L

    3. The attempt at a solution

    Finding the area first (l*w?) = 1.0 m * .2m = .2m


    (0.046 * .2) * (20/.2) = .92 degrees
  2. jcsd
  3. Apr 14, 2010 #2


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    Do your units match up?
  4. Apr 16, 2010 #3
    I got it right :-) Sorry, I'm a noob. I was plugging in the wrong Area, and it was causing my number to come out wrong.

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