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Heat transfer

  1. Jan 18, 2012 #1
    hi im new here

    a query about heat transfer-
    there are layered walls with different conduction coefficient.
    the last layer is maintained at freezing point while the first is at room temperature
    my question is will the ice not melt at the last layer considering that its temperature is maintained?

    thanks
     
  2. jcsd
  3. Jan 18, 2012 #2
    Since heat is trasferred from hot to rather cold material and room temperature and outer-layer wall's temperature is constant, Ice should melt.

    There must be some "heat source" inside the room. (I recognized that room temperature is higher than freezing point.)

    Then Ice covering outer wall get exactly same amount of heat that heat source is making inside the room.
     
    Last edited: Jan 18, 2012
  4. Jan 18, 2012 #3

    Drakkith

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    Staff: Mentor

    If whatever is maintaining the temperature of the inner layer is able to pump the heat out as fast as it can come in then no, the ice will not melt.
    Edit: What exactly are you describing? Is this like a sealed container with the inside at freezing temperature, or something else?
     
  5. Jan 18, 2012 #4
    yes a closed enviroment with a hyothetical system maintaining the temeratures at the ends. the layers of the confinements of a house is its most practical application.
     
    Last edited: Jan 18, 2012
  6. Jan 18, 2012 #5

    Drakkith

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    Staff: Mentor

    Then yeah, if your heat pump can keep up with the rate of heat absorption into the inside, then the temperature will stay the same. Better insulation results in having to do less work as there will be less heat transfer per unit of time.
     
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