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Conductive Heat Loss in a house

  1. Sep 22, 2009 #1
    1. The problem statement, all variables and given/known data
    If only conductive heat loss was significant for a house, then by what percentage would you lower the heat loss if the temperature was reduced inside from 73°F to 67°F, when the outside temperature is 21°F? (Hint: Try using a ratio.)

    2. Relevant equations

    3. The attempt at a solution
    I do NOT want the solution just need to know what formula i should use to find the answer.

    possibly a example problem but NOT the answer please, i want to learn how to do it.
  2. jcsd
  3. Sep 22, 2009 #2


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    Homework Helper

    The heat loss is proportional to the temperature difference.
    So as an equation you would write Power = k * (Tinside-Toutside)
    The value of K would depend on your units for temperature, the material the house is made of and it's insulation - the important point is that k does not change.

    Remember as well that you need T in absolute units.
  4. Sep 22, 2009 #3
    But because the power is proportional to the temperature difference you can express the temperatures in Celcius as well as kelvin.Both give the same answer.
  5. Sep 22, 2009 #4
    Thanks you guys are awesome
  6. Sep 28, 2009 #5
    Could someone give me the answer the this problem? I have a similar problem and need help.
  7. Sep 29, 2009 #6
    so what would the value of k be then? thats what i cant figure out.
  8. Sep 29, 2009 #7
    i have Power=k(19.4C-(-6.1C))

    k isnt given in the problem?
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