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

  1. #25
    Av8tor1's Avatar
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    Paul,

    I remember the thread, I also remember us talking about heat issues but forgot/didnt recall you using a peltier...

    very kewl...
    Butch

  2. #26
    Not Growing Up! GrowinOld's Avatar
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    Butch,

    Yea, it was low profile!
    I am still working up an improved version, and have learned a lot from my first prototype.

    Well, good luck.
    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

  3. #27
    BANNED
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    Cool!

  4. #28
    Av8tor1's Avatar
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    30w Peltier Trials...

    #1 Last night
    Conditions: 10 gallon empty aquarium with top covered in styrofoam.

    Results: 5f drop from ambient after a couple hours. Maintained temp differential from ambient but no further drop.

    #2 This morning

    Conditions: 10gal aquarium, top covered with styrofoam and bottom covered with used CP substrate to a depth of approx 2"
    4 of 4"x4"x4" net pots filled with sphagnum placed in chamber (could hold about 10-12)

    Results: Temp drop significantly faster, after one hour 6.3f drop from ambient.
    (Trial still running)

    To be continued... still want to see what filling the usable area up with pots will do. Then try the same trial with insulated sides and rear
    At first glance a 6.3f temp drop doesnt seem like much, but if we also have a 5f rise from the lights (very probable) then our total delta T is already over 11f

    Paul, since you have "been there and done that" mate, any words of wisdom?

    Av

  5. #29
    Av8tor1's Avatar
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    30w peltier trials.... continued

    Still working on increasing efficiency of the module assembly

    Sorry for the cheesey cell phone image, but it's all i have handy

    Notice the ice formation on the cool... errr cold side
    Ambient room temp 70F

    Cheers'
    Av

  6. #30
    Not Growing Up! GrowinOld's Avatar
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    Tip of the week:

    Insulation is a bigger friend than you could possibly imagine!

    Thermal mass takes time to release its stored heat, so every day the battle must be fought, unlike a refrigerator which stays closed most of the time. (We don't bring everything to 72 degrees every day, but on these unite we expect to.) It is not that the units are bad in and of themselves, but we are asking a lot from them.

    For me it has become a balancing act. Make a list of all the variables and you will understand what I mean. I have a Peliter unit on a chamber about the size of a 20+ gal tank. A LOT depends on ambient temps.

    And Insulate! Insulate! Insulate! And then Insulate some more!
    If you add enough insulation until it looks bulky and ugly, and then add more!... you will be close to the amount you are gonna need! (Like people are finally finding out with insulation, it saves a lot of energy and makes up for its cost in no time!)

    Av, lots of time, study, experiments and effort and that's all I have for you right now!
    By the way, what is your motivation for this project?

    Hope some of this helps!
    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

  7. #31

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    That puppy looks nice it's working like a charm there Butch! Next project is too make it cool a 12 pack

    Quote Originally Posted by GrowinOld View Post
    Insulation is a bigger friend than you could possibly imagine! And Insulate! Insulate! Insulate! And then Insulate some more!
    Sounds like we're halfway there. I'm wondering if insulating the outside of the tank would help any? Insulation/glass/insulation. I'm guessing though that at some point we reach a plateau since this is just going to be a 20 gallon tank.

    Quote Originally Posted by GrowinOld View Post
    By the way, what is your motivation for this project?
    Heheheheheh......

  8. #32
    Av8tor1's Avatar
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    Paul,

    My goal was to make a "feasible" 30w/10 gallon UHL tank... Yann wanted to try pushing the envelope. So we are going to try the 30w module with a 20 gallon tank.

    I'll be honest, I still dont know if it will work.... as you stated there is a lot of thermal capacity to deal with. Yann has insulated the sides, rear and bottom of his tank and the top will be removable Plexiglas.

    My last recommendation (if needed) would be to make the front glass a sealed "double pane" by framing the inside perimeter of the front glass with strips of insulation foam as a spacer, then silicone in a secondary Plexiglas layer

    The fact that the 30w module I built will now freeze over in 70f ambient temps does give me a warm and fuzzy feeling.... but of course that is with minimal airflow.

    I have no doubts about a 30w/10gallon, but we shall see how this works...

    I still have a 70w assembly to finish... Ive got the power supply, etc etc etc... that will be my next trial

    That may be my "tepui" tank

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