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Thread: Absorbing and releasing heat

  1. #1 Absorbing and releasing heat 
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    Hello,

    Can any one recommend a material that is good at absorbing heat between 40-70c and the slowly releasing it. It can't be liquid. Would be grateful for the advice. cheers


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  3. #2  
    Forum Isotope Bunbury's Avatar
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    Depends what you mean by good at absorbing heat. If you mean fast, then a material that absorbs quickly is going to release quickly too.

    If fast heating isn't important you should look for a material with a low thermal diffusivity. Non-metallic materials might be best, such as concrete, packed sand or even wood.


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  4. #3  
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    Sodium sulfate decahydrate-- Glaubers salt great for heat storage.

    Wood?? you gotta be kidding!
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  5. #4  
    Forum Isotope Bunbury's Avatar
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    Quote Originally Posted by fizzlooney
    Sodium sulfate decahydrate-- Glaubers salt great for heat storage.
    Glauber's salt's heat storage property comes from latent heat of fusion - solid to liquid and back, so doesn't fit the specification "can't be a liquid".

    Wood?? you gotta be kidding!
    Ever been in a log cabin on a cold mountainside hours after the fire's gone out? Mmm toasty!

    http://en.wikipedia.org/wiki/Thermal_diffusivity
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  6. #5  
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    Ok - beryllium- highest heat capacity around- don't think you can afford it!
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  7. #6 Re: Absorbing and releasing heat 
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    Quote Originally Posted by juli
    Hello,

    Can any one recommend a material that is good at absorbing heat between 40-70c and the slowly releasing it. It can't be liquid. Would be grateful for the advice. cheers
    Don't know off the top of my head of what's best, but you can buy Sheetrock used for interior wall construction, that has parriffin in the form of C25H52 in it. It melts but is held in place with the gypsum, and retain heat well, releasing it as it returns to a solid.

    Modern energy efficient houses are constructed this way.
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  8. #7  
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    It would help if you explained what you are trying to do. how many BTUs are you dealing with? Main factors are heat capacity, mass , and thermal conductivity.
    i have a partially earth sheltered home.
    Actually a large bin full of round river rocks works quite well for applications such as home heating. stone has a relatively good heat capacity.
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  9. #8 Re: Absorbing and releasing heat 
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    what is the best heat absorbs and released material
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