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Thread: Peltier cell questions

  1. #17

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    Sorry, missed your post about the waterblocks.

    Yes, they are more expensive, but they work 10 times better. You see, its all about surface area. If you have a larger surface area to move air accross, then you get a larger amount of heat transfer. Same reason there is a radiator in your car, only difference is, this is the reverse. You would have to buy a pump (for this application you don't need a high flow pump, some $20 job from your local pet store works fine) and you can get a heaterblock from autozone for $15 and you could probably find a waterblock on e-bay for the same.

    I am actually going to set up a highland tank using this idea, the best thing is the waterblock has 4 holes in it with tension screws that you can screw directly into your heatsink/fan. Basically sandwiching the pelt inbetween for better contact.

    Basically, the waterblock is cooled by the pelt, water is pumped into a radiator which then cools the copper fins, air blows accross the fins and into your tank.


    Casper

  2. #18

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    Hello Casper,
    Thanks for the input!! I am no electrician, so I don't know squat about grounding things, I plan on doing what I did for my air circulation fan, just sauter it to a standard power supply converter (AC I think) like you can get at Radio Shack... Also, I didn't notice last time I was in there, but does anyone know of they sell heatsinks? Thanks again!!

    [img]http://www.**********.com/iB_html/non-cgi/emoticons/biggrin.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/alien.gif[/img]
    P.S. Copper, I don't know whether I want MAXIMUM squeeze out every last drop of cold, because I only want between 55-45*F, but maybe I do, because I don't know to much about them... I am still working on ideas for figure 2... Thanks!! [img]http://www.**********.com/iB_html/non-cgi/emoticons/biggrin.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/alien.gif[/img]
    I am back..

  3. #19
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    Not sure about the arrangement. Putting them in the hood sounds easiest but might conflict with light placement. You mention 2 tubes but might want to consider 4 tubes for highland Nepenthes. They will enjoy the extra light.

    My other thought is to get things operational and monitor temps etc. Don't want to be freezing the plants if the peltiers work better than expected!

    Tony
    Is that a Nepenthes in your pocket or you just happy to see me?

  4. #20

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    I may do a comprimise at 3 tubes, currently they are on one in a 24 gallon tall, and are pretty darn colorful, and I don't want it to be to much of a difference, although I think that they could take a little more... Also, remember that the tank is only 13" tall, so they would be darn close to the lights since their pots are about 4" tall. Also, there are reflectors on three sides of the tank, so the light is bouncing around well. Also, when I'm gone I often put a reflective cover on the front to help out with the light reflection... (BTW, I am referring to my current tank, but would do the same with this one...) THANKS AGAIN!! [img]http://www.**********.com/iB_html/non-cgi/emoticons/biggrin.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/alien.gif[/img]
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  5. #21

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    How soon are you building this?

    If its going to be a few weeks, I can try to do an experiment for you. I have the watercooling system here, but I need to get another HS/F and a pelt.

    About the ground. A lot of people will pull the 3rd prong out of a plug to fit it in a 2 prong timer (the cheap kind) DO NOT DO THIS WITH A POWERSUPPLY AND PELTS!! Basically, if there is a short, instead of catching fire, the electricity gets sent back to the plub and it trips a breaker. Pelts draw as much power as the power supply can possibly give it, which in turn heats the power supply up, and with a cheap power supply in very rare cases it can melt the wires and short out (not a problem if its grounded)

    Same thing with your lights, especially if you have them inside your terrarium, they should be grounded.

    I did actually use the cheap timers and pull the grounds off my surge protecter to use it, but I spliced the 2 grounds together and hooked em to a bare plug so its still grounded to the house. (I didn't check the timer, and didnt feel like going back to home depot)


    Casper

  6. #22

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    Ok, thanks for the offer, but I plan on doing this sooner... Anyways, what is the power supply only comes with 2 prongs? I guess I could find one with three... Also, since I only plan on running this 30 mins to an hour at a time, and all of my (many) electronics (both current and upcoming) are and still will be hooked up to a 6-way surge protector, which I was under the impression was the same thing as a master grounding system for everything plugged into it... (which is a lot, currently 5 or six, but will be 9 or 10... At least we have breakers for every individual outlet, and they are on a surge protector... BTW, the most things actually running at once will be onl 5 or six, not counting the opposite timer turning on/off the other things that will then be off. So basically, I'm not to worried about it, because my current setup has endured many a hail storm and tornado (read power outage) no problem... Any more suggestions? THANKS A MILLION BAZILLION QUADRILLION!! P.S. I am just going to try what is mentioned in Figure 2, and see if it works, hopefully well enough for a 15-25*F drop... Thanks again!! [img]http://www.**********.com/iB_html/non-cgi/emoticons/biggrin.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/alien.gif[/img]
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  7. #23

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    Well, here's an update:
    Today or tomorrow I will order two peltiers and two heatsinks (unless anyone thinks that it is ultra-neccessary to have three...) Than, after I get power supply, thermal grease, etc., I will do some experimenting on positioning of peltiers, fan, etc, and I am hoping that I can get the results that I am looking for out of two peltiers, if not, I will order a third... Any last suggestions? Thanks for all of your help thus far!! [img]http://www.**********.com/iB_html/non-cgi/emoticons/biggrin.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/alien.gif[/img]
    P.S. I will update you again once I setup, experiment, etc... I hope that this will:
    A. Make more people find it easier to cool highlanders(including me)
    B. Help you setup one of these setups for yourself. [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img]
    I am back..

  8. #24

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    I just have two things to comment:

    1) Peltiers are much less efficient than compressors (ie conventional refrigerators)

    2) The setup with water cooling, etc is cool, but an old chest freezer modified as described in an earlier issue of ICPS Carnivorous Plant Newsletter will probably be easier, cheaper and work better ... and be much cheaper to operate (better insulated, better efficiency).
    There's no 'a' in perlite.

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