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Thread: 25% Increase in heat dissipation

  1. #1
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    Default 25% Increase in heat dissipation

    New Copper compound

    A scientist discovered a way to cool semiconductors much more efficiently than a traditional copper-based heat-spreader can.





    According to Jag Kasichainula, an associate professor of materials science and engineering at NC State, graphene could be key to improve simple cooling methods.

    The scientists developed a heat-spreader that consists of a copper-graphene composite that was attached to an "electronic device" with an indium-graphene interface film. Tests showed that the increased conductivity by using graphene can dissipate heat about 25 percent faster than pure copper. Kasichainula also noted that graphene is less expensive than pure copper, which could reduce the cost of heat spreaders in the future.
    In a paper published in the April 2012 issue of Metallurgical and Materials Transactions B claims the researcher describes test results in which a 200 micron thin film of copper-graphene deliver a thermal conductivity of 460 watts per meter per kelvin (W/mK), up from just 380 W/mK of electrolytic copper at a temperature of 27 degrees Celsius. The conductivity of copper-graphene increases with lower temperatures and decreases with substantially higher temperatures. Kasichainula said that the conductivity was 510 W/mK at -23 degrees Celsius and 440 W/mK at 77 degrees Celsius.

    Graphene Enhances Efficiency of Heat Spreaders by 25 Percent

  2. The following users thank 2 For this above post:

    aryan51 (14-04-2012), realneil (15-04-2012)

  3. #2
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    Default Re: 25% Increase in heat dissipation

    can't wait till this tek comes to us!!!!! thank kev for the news
    You Raise The Blade You Make The Change


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    Default Re: 25% Increase in heat dissipation

    something doesn't sound right, 510W/mk was at -23c but 440W/mk was at 77C ???

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    Default Re: 25% Increase in heat dissipation

    Quote Originally Posted by Doctor_Death View Post
    something doesn't sound right, 510W/mk was at -23c but 440W/mk was at 77C ???
    Thats beyond my beducation.

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    Default Re: 25% Increase in heat dissipation

    Quote Originally Posted by Doctor_Death View Post
    something doesn't sound right, 510W/mk was at -23c but 440W/mk was at 77C ???
    Quote Originally Posted by Drdeath View Post
    Thats beyond my beducation.
    what so weird about it?
    the material conducts heat better at lower temp and degrading its performance at high temp due to material phase changes. Even with the lost of conductive at high temp, the graphene is still transferring heat better than copper.

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    Default Re: 25% Increase in heat dissipation

    Tony, last time I checked 510 was higher than 440, so why was there close to a 100c increase in temps going from 510 to 440 ?
    Minus 23C at 510 but 77c at 440, it was cooling better at 510W/mK

  8. #7
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    Default Re: 25% Increase in heat dissipation

    the Graphene can conduct heat up to 510W/mK at -23C but only conduct heat up to 440W/mK when the temperature at 77C.
    The conductivity of copper-graphene increases with lower temperatures and decreases with substantially higher temperatures. Kasichainula said that the conductivity was 510 W/mK at -23 degrees Celsius and 440 W/mK at 77 degrees Celsius.
    this is cause by material phase change. Therefore, the graphene is best suit to use with sub-zero cooling setup.

    Pure copper can conduct heat up to 380W/mK at 27C but with copper/graphene, it can conduct up to 440W/mK at 77C.

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    Default Re: 25% Increase in heat dissipation


    These fins are way too close together to properly maintain air flow. At my house they would be clogged with dust in a few weeks.
    A 25% improvement in cooling performance is welcome if it works on traditional cooler designs too.


  10. #9
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    Default Re: 25% Increase in heat dissipation

    forget about all the pics you see in the article, they just use any cooler images for the article. The article was talking about the graphene material, they didn't talk about the cooler.

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    Default Re: 25% Increase in heat dissipation

    25% better cooling is welcome as I see it.

  12. #11
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    Default Re: 25% Increase in heat dissipation

    Quote Originally Posted by realneil View Post
    25% better cooling is welcome as I see it.
    and cheaper too....

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