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Peltier Junction Heats, Doesn't Cool

  1. Nov 20, 2004 #1

    Mk

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    I have a peltier junction rated at 12V and when ran both sides become hot, what's wrong?
     
  2. jcsd
  3. Nov 20, 2004 #2
  4. Nov 20, 2004 #3

    russ_watters

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    Staff: Mentor

    You need to strap a heat sink to it, otherwise there is nowhere for the heat on the hot side to go except over to the cold side. I bought one a couple of months ago to play with and I got two heat sinks with fans and rubber banded them together with the peltier in the middle.
     
  5. Nov 20, 2004 #4

    Mk

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    Ahh, thanks guys. Yeah, I have a heat sink already from my gutted Pentium 2. If I turn down the voltage, can I feel the coolness of one side? How can you tell which side will be hot, and which will be cold?
     
  6. Nov 20, 2004 #5

    russ_watters

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    Staff: Mentor

    Without a heat-sink, you'll need to be touching both sides the moment the power is applied to tell the difference. But it should work (with a heatsink) at 5V - I used a computer power supply to run mine for testing.
    Unless its marked, you have to turn it on to find out - and trust me, you'll know. It takes less than a second for it to cool 50+ degrees.
     
  7. Nov 21, 2004 #6

    Mk

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    Is there a maximum heat output? Can I turn the voltage up past 12V?
     
  8. Aug 6, 2009 #7
    Most put a thermal switch in that cuts out at 150 degrees F. yes you can go past 12 volt NOT ALL but most 12 volt pelter junctions have a absolute max voltage input of 15.2 volts
     
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