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How to transfer cold energy instead of heat?

  1. Aug 15, 2011 #1
    How to transfer "cold" energy instead of heat?

    My question is pretty basic. I am looking to radiate cold with the same concept of heat dissipation. For example on a peltier thermoelectric module gets hot on one side and cold on the other. A heatsink will help dissipate the heat from the hot side, but could I also add a heatsink to the cold side, blow air over it and feel a cold breeze? Or does cold not work through a heatsink the same way? I'm sure it does to some effect but is that the most efficient way u think? Any help would be greatly appreciated
     
  2. jcsd
  3. Aug 15, 2011 #2
    Re: How to transfer "cold" energy instead of heat?

    The heat sink could transfer the cold temp to the passing air cooling it down and warming your cold surface through conduction. However radiation only works one way, it reduces the temperature by radiating the energy away in EM waves.
     
  4. Aug 15, 2011 #3
    Re: How to transfer "cold" energy instead of heat?

    I have a little enclosure that I need to drop the inside temperature of somewhat considerably. My idea is to blow this cold air through the heatsink on the cold side into the enclosure and pull cycle the inside air out of the inclosure and through the hot side heatsink to dissipate the heat coming off the hot side and out into the open air. Like an exhaust. Just trying to make sure the cold side heatsink would actually transmit that cold through it and transfer it by blowing air through it. I just didn't know for sure if air over a cold heatsink would actually transfer efficiently. Or if there was some other more efficient way of pulling the "cold" coming off the flat surface of the peltier chip and into the enclosure.
     
  5. Aug 15, 2011 #4

    Drakkith

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    Re: How to transfer "cold" energy instead of heat?

    Other than cold simply being a lack of heat and not a quantity in itself, meaning you cannot "radiate" cold like you can heat, your idea is sound. It is exactly how any AC unit works. The blower sends air over the coils which are much cooler than the air and absorb heat, cooling the air and hence your house or car or whatever.
     
  6. Aug 15, 2011 #5

    Drakkith

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    Re: How to transfer "cold" energy instead of heat?

    It might be more efficient to continually cycle the cold air into the enclosure, back to the cold side heat sink, and then back into the enclosure.
     
  7. Aug 15, 2011 #6
    Re: How to transfer "cold" energy instead of heat?

    That's more or less how I have it in my head so I'm glad you said it.

    I appreciate you guys weighing in. Hopefully this little setup can get the desired results. I guess all I'm making in the end is a tiny airconditioner :)
     
  8. Aug 15, 2011 #7

    Drakkith

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    Re: How to transfer "cold" energy instead of heat?

    Yep!
     
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