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Homework Help: HELP Thermodynamics question

  1. Jun 26, 2011 #1
    HELP!!! Thermodynamics question

    1. The problem statement, all variables and given/known data
    Which would you chose between paraffin & wood to make heat storage? Why?
    specific heat of paraffin = 2900 J/kgC
    specific heat of wood = 1750 J/KgC

    2. The attempt at a solution

    They say that the answer is paraffin but I don't know why. Could anyone help me to deal with this problem?
  2. jcsd
  3. Jun 26, 2011 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    Re: HELP!!! Thermodynamics question

    For effective heat storage you want the temperature of the substance to decline as slowly as possible as heat is removed.

    Paraffin is also good because it has a very high latent heat of fusion, so if you heat it above its melting point it will stay at same temperature (ie its melting point) for a long time as the heat flows out of it.

  4. Jun 30, 2011 #3
    Re: HELP!!! Thermodynamics question

    Thank you very much :)
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