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Homework Help: Heat removal question, refrigerator.

  1. Feb 18, 2008 #1
    Heat does not naturally flow from a cool body to a hot body. A
    refrigerator, however, does remove heat from the icebox and expels it as
    warm air to the outside world. In terms of enery, what is required to make this process
  2. jcsd
  3. Feb 18, 2008 #2
    Cooling systems typically make use of a phase change of a fluid. I would go into more detail, but wikipedia can take it from here.
  4. Feb 19, 2008 #3

    Andrew Mason

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    Science Advisor
    Homework Helper

    The second law of thermodynamics requires that for heat to flow from a cooler to a hotter reservoir, work must be done on the system. The actual mechanism of by which this is done may vary between devices (e.g. Joule Thompson effect, evaporation, solid state diodes) but the second law is always be obeyed.

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