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Thread: Peltier Elements!

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    Question Peltier Elements!

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    so are these things worth it?
    AND whats the difference between a 80W, 172W and a 266W???

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    HEXUS webmaster Steve's Avatar
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    If you don't know what the wattage means you REALLY need to read up on them before you start thinking about using one.

    Sure, they get things mighty cool, but:

    They use a lot of power,
    They cause condensation,
    You need watercooling along with them otherwise there's no point.
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    80W and 172W and 266W are just different powers. W as in Watts as in power, also that means there gonna be dragging that much (slighly more) from the power supply so alot of people have stand alone powersupplys to power just there watercooling. Higher in theory the colder/hotter the sides'll get.

    I presume if there is a condensation risk then you just use Dilectric grease.

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    Grease and insulation foam sponge thing are the way to counter condensation. I forget the special name of the foam, though.

    You'll need around a 220W pelt, and an adequate wc system in order to cool an AMD chip. I'm not sure about pentiums, but I think it's around 172W+. Higher the better, though.

    You're best looking at places like extremecooling.com for pelt advice, though.

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    why is it they ONLY work with water cooling?

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    Because one side gets really cold and one side gets really hot. You have to have a way to remove the heat from the hot side and fans won't do it.

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    You need watercooling because a 200watt pelt creates 200 watts in the form of heat - and it needs to go somewhere. No air cooler can shift that much.

    Furthermore, pelts don't tend to run at 12V so you need a standalone PSU of some sort (you can mod a second ATX PSU in some cases, but it depends on what you want from the pelt, and what wattage it is.)
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    200 Watt TEC + 35W 2500 - m = ???

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    Quote Originally Posted by Theo
    . I forget the special name of the foam,
    Neoprene - AKA wetsuit material

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    Quote Originally Posted by kez
    You need watercooling because a 200watt pelt creates 200 watts in the form of heat - and it needs to go somewhere. No air cooler can shift that much.

    Furthermore, pelts don't tend to run at 12V so you need a standalone PSU of some sort (you can mod a second ATX PSU in some cases, but it depends on what you want from the pelt, and what wattage it is.)
    LIES! http://forums.procooling.com/vbb/sho...5&postcount=19

    It would be fully possible to do that with air cooling on a cpu, but needs high airflow, and lots of surface area on heatsink.
    I recon a SLK800 is capable of 172w given a 100cfm of 10-20C air ducted from outside, with the hot air ducted away... A suitable fan would be a 80mm delta 12v high cfm fan, ran at 24v. Ear protection would be advised however.
    There wouldnt be much space for condensition proofing for the motherboard though... I might have to try air cooling 172w+ pelt when I get round to making a waterchiller, phase change would be more efficent though..
    Last edited by SilentDeath; 13-03-2004 at 05:13 AM.

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    These TECs are only that wattage if you run them on a 15v supply. If you're using 12v the wattage will be about half.

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    Just done a quick bit of Ohms Law
    A 226w TEC @ 15v will be a 144w TEC @ 12v (approx)
    I know I know... a Pelt ain't a pure constant resistive load, but it's near enough

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    Senior Member SilentDeath's Avatar
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    half is 113W. Running at 12v is 180W, which is quite a big difference....
    Also there are easy'ish ways to adjust the voltage of PSU's to give the full 15v...

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    Quote Originally Posted by |SilentDeath|
    half is 113W. Running at 12v is 180W, which is quite a big difference....
    Also there are easy'ish ways to adjust the voltage of PSU's to give the full 15v...
    No, it's 144w @ 12v not 180w
    You're under the mistaken impression that if the voltage is reduced, the current stays the same. If you halve the voltage across a resistor, you don't halve the power, you quarter it.

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