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Thread: To peltier or not to peltier, that is the question

  1. #17
    Av8tor1's Avatar
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    Free downloadable thermoelectric handbook

    http://www.lairdtech.com/temhandbook

  2. #18
    Carnivorous plant enthusiast vraev's Avatar
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    fantastic mate. If in the future I have to downscale my setup to something small and for a couple of plants...I would seriously do this....or more likely...get it done. lol!

  3. #19
    Av8tor1's Avatar
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    Building a small peltier unit for a fellow CP'er

    The first step is constructing/preparing the heatsinks and thermal spacer.
    The primary causes of premature Peltier module failure is having it under sheer stress and/or moisture problems.
    While it can handle compression loading it is very vulnerable to sheer.
    It's important that there is enough "meat" in the heatsinks to prevent this problem. The bolt holes must also be close to the module for the same reason.
    The thermal space is also thick enough for structural strength and separation the two temperature regions. All contact surfaces are true within +/- 0.001"

    AMD socket 754 heatsinks were ideal for this project and required very little modification, the thermal spacer had to be custom made though.








    Disregard the black tape, for demo purposes only



    Now just waiting on some #10-32 x2.5"stainless steel socket head bolts to arrive. Regular bolts would rapidly corrode due to galvanic conditions

    Once everything is bolted in place, the module region will be coated with a heavy coat of epoxy for moisture protection. Then mounts will be added and everything in the middle insulated with high density foam.

    Av

  4. #20

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    Looking sharp! Those heatsinks look like they'll fit MUCH better than the ones previously. Looks like that this baby going to be purring pretty soon

  5. #21
    Av8tor1's Avatar
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    bullet proof.... oh and not pictured is the pulse width modulation control unit I added for ya
    You will have adjustable fan speed control on the cool side

    (had one laying around from a project I built a couple years ago...)


  6. #22
    Carnivorous plant enthusiast vraev's Avatar
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    That is fantastic mate. Let us know about its effciency.

  7. #23
    Av8tor1's Avatar
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    Pure efficiency (usable output/input ) will still be crap... hard to turn do-do into ice cream
    Buttttttttttt on such a small scale this level of inefficiency is acceptable as long as it works, so temperature drop is the metric to judge it by.

    If it will drop the temp 10-15f overnight I will consider it a success (this trial is based upon a small 30w module... so it can run 8-12hrs w/o much danger of over cooling, power supply demands stay reasonable and resultant heat remains acceptable)

    As the technology stands today, I personally don't see peltiers being a viable option for anything over a 5 or 10 gallon microchamber...

    Av

  8. #24
    Not Growing Up! GrowinOld's Avatar
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    AV,
    I have had a chamber for a bit over a year and a half, and while it cools
    it isn't the most ideal system as you noticed.
    I am still hoping to get it working better, but it isn't the best route to go so far.
    (I think I have pics out on my "terrarium" on the forum from about a year back.)

    Glad to see you are having fun doing it!
    It is nice and "clean" & simple compared to compressor systems,
    but indeed it does lack in the efficiency dept!

    Take care
    Paul
    Experience is the best teacher. At least it used to be.
    But then, common sense isn't so common anymore, is it.


    http://www.terraforums.com/forums/sh...d.php?t=113866

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