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: 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


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    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.

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