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Thread: Peltier Cooling System

  1. #1

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    Hello all,
    Well my electrical questions topic had goten WAY too long, so here is a new topic with a better title. Anyways, I have setup a Peltier cell "sandwich" where there is:

    --------------------Heatsink-------------------------------
    --------------------Peltier Cell-----------------------------
    --------------------Heatsink(coldsink)----------------------

    Anyways, it has been effective, cooling form about 75*F day to 65-63*F at night. My goal was below 60, so not bad, because I am still experimenting... It is currently all on top blowing in like so:
    Peltier sandwhich
    ----------------------------(lid)

    (don't you love dashes and letters) [img]http://www.**********.com/iB_html312/non-cgi/emoticons/wow.gif[/img] [img]http://www.**********.com/iB_html312/non-cgi/emoticons/wink.gif[/img]

    Anyways, I am considering cutting the lid so the cold side can be inside of the tank, hot side outside. I am sure this would be most effective, but I am wondering if there are any other good tweaks so I can save my lid...

    Yes, the heatsinks do have fans... The growchamber is equivilent (sp?) to a 55 gallon long tank, but is made from acrylic. With my ultra-fine mist, I get about 59-60*F. Factor in ice bottles, and I'm a happy [img]http://www.**********.com/iB_html312/non-cgi/emoticons/laugh.gif[/img] camper.

    Thanks a million for any input!! [img]http://www.**********.com/iB_html312/non-cgi/emoticons/unclesam.gif[/img]
    Caio!
    Lithopsman
    I am back..

  2. #2

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    It's sort of like holding the refrigerator door open to cool down the room... [img]http://www.**********.com/iB_html312/non-cgi/emoticons/tounge.gif[/img]

    You should definitely consider mounting the peltier through the lid. Alternatively, you could mount it in a separate small tank like the setup homer has for ventilation. Then you can make sure the cool air is well-distributed within the grow chamber.

    Is caio the same thing as ciao in a different language?
    There's no 'a' in perlite.

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  3. #3
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    Cool

    Hmmm. I do have an extra heat sink, ATX powersupply, and fan. I might just be able to pull off a peltier system for cheap. Just need to get the peltier, another heatsink(cold side), and I should be ready to go. Only question is, would my *tropical* species like N. gracilis like to be chilled down to the 50's at night? At least for the winter? Choices, choices...

  4. #4

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    Come on, Homer, what kind of talk is that? It sounds to me like a perfect excuse to split your neps into lowland and highland tanks. [img]http://www.**********.com/iB_html312/non-cgi/emoticons/wink.gif[/img]
    There's no 'a' in perlite.

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  5. #5

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    Homer, come on! Please tell me that you are kidding, if not I apologize for assuming... N. gracilis is a lowland tropical, andas such it likes constant warm temperatures. As for highlanders like my setup is for, it seems to be working GREAT!! [img]http://www.**********.com/iB_html312/non-cgi/emoticons/biggrin.gif[/img]

    @D. muscipula: The ciao spelled caio was just a spelling mistake... But theoreticly(sp?) it is the same.
    [img]http://www.**********.com/iB_html312/non-cgi/emoticons/wink.gif[/img] [img]http://www.**********.com/iB_html312/non-cgi/emoticons/rock.gif[/img] [img]http://www.**********.com/iB_html312/non-cgi/emoticons/tounge.gif[/img] [img]http://www.**********.com/iB_html312/non-cgi/emoticons/unclesam.gif[/img]
    I am back..

  6. #6
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    Exclamation

    Well, I was thinking of riding the gracilis hard to see what its made of, but I might not since the gracilis has spouted new growth near the base [img]http://www.**********.com/iB_html312/non-cgi/emoticons/laugh.gif[/img] and I'm getting some tropical drosera (Petiolaris) any day now [img]http://www.**********.com/iB_html312/non-cgi/emoticons/smile.gif[/img] Since they are all going to be in the same tank, it might as well be hospitable to tropcial lowland CP's.

    I don't have room or the motivation at this point in time to construct a new highland tank or peltier system... i'll just be happy with the ventilation system, pygmy terrarium and new plants. [img]http://www.**********.com/iB_html312/non-cgi/emoticons/wink.gif[/img]

  7. #7

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    I am working on something similar for my N. rajah. I am currently using a styro cooler with the guts of a mini cooler's thermoelectric cooler. I can get a temp drop from 73 to 60 degrees. However, I cannot get the system cooler nor can I get the temps above 73 without overheating the cooler. I have thought about putting the thermo on a timing to turn off and on every 30 minutes.

    Any ideas on how to warm up the cooler? I have a compact flourescent lamp sitting directly over the opening I have cut on the top. This opening is covered with a clear acrylic sheet.
    Nick

    Careful where you crawl, it might be a trap!

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  8. #8

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    Nick you need a thermostat to be able to do that. In fact if you look around on the net you will probably find a control circuit for the peltier that lets you heat and cool with it.

    I have been playing around with peltiers to cool a terrarium I am working on for Golden Mantellas. I find that two Peltiers stacked cool-to-hot, then wired in series is more effective then two stacked or side by side in parrell, and drraws half as much current. Just thought I'd share that tid bit. In my final design I think I will use 8 peltiers assembled into 4 two-stage Peltiers. It should draw right at 10 amps.

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