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Thread: Possible cooling breakthrough!

  1. #9

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    Actually, the purpose of the setup is to make sure that i can keep the terrarium at least at outside temperatures at night. My room is the top floor, western corner, with windows facing SSW and WNW. It gets awfully warm in here when the sun is shining, and takes a while to cool down.

    I couldn't say how much the evaporation from the reservoir lowers the temperature from ambient, especially since the temperature and humidity vary all the time (Boston weather). When it's hot it's usually also pretty humid, so probably not very much.

    I have a deactivated lab equipment cooler that may or may not be functional. I plan to set it up to cool the water in the reservoir to 10C at night starting in a couple weeks. So far this 'summer', it's been getting to 15C in the terrarium at least every other night. Daytimes it can occasionally rise to 28C or even a bit higher if it's a hot day.
    There's no 'a' in perlite.

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  2. #10

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    I would be very curious to find out how well that setup would work here with the low humidity and air-conditioned house... I also am trying to figure out ways to cool the air that contains the fog, perhaps with one of these lab chillers? How expensive do you think they run? (I know yours was a gift)
    Or I could use my peltier setup to cool the enclosure that houses the fogger, then have cold fog blow through? Does that sound like it could win a few more degrees?
    Thanks,
    ~LM~
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  3. #11

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    There are some on Ebay (search for NesLab). Probably more money than you want to spend. It's definitely not the cheapest way to do what you're trying to do.

    Unless you're trying to reach ultrahighland temperatures, if you live in an air-conditioned house, simple evaporative cooling should be adequate.

    Taking air to be a diatomic, ideal gas, and making a bunch of other assumptions, i estimate that to decrease the temperature 8*C from an initial temperature of 20*C and relative humidity of 30%, you'd have to increase the relative humidity to 80% (relative at 12*C, of course). That seems to make evaporative cooling a little too effective to my intuition, so maybe i messed up. But anyway, there ya go. The point is that evaporation of water is a very effective way to cool something. Who needs more than 10*C change?

    I did, however, not consider the heat added to the water as the ultrasonic humidifier 'atomizes' it. That will obviously reduce your net cooling somewhat.

    If you want to cool the the water first, that will be of some use, but there's really no comparison with the effect you can get from evaporation of water.

    Make sure you're not cooling the saturated air after humidifying it... that way you're just putting in work to condense some of the water, instead of cooling it further.
    There's no 'a' in perlite.

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  4. #12

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    I'll have to take the condensation facts into consideration... I already grow and cool my ultrahighlanders wonderfully, but I always like to try new things, so we'll see how well it works... The growchamber is generally about 70-80% humidity, so I don't know how much room there is for cooling, but since it is force-fed air it might be different. If any of you are car maniacs like me, a simple way to put this is that it functions similar to a supercharged (forced induction) engine. I think this is getting way outta hand... I'M LOVING IT!! [img]http://www.**********.com/iB_html/non-cgi/emoticons/biggrin.gif[/img]
    ~LM~
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  5. #13

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    Cool plan, but you're gonna need lots of space for that + equipment $. I already have the mister, now I just need the 2 fans and the PVC pipe. I thought of something like that (a random cooling device with fans + mister placed) anywhere, but didn't actually get it into a system like your. Good job! Might try it if can afford... [img]http://www.**********.com/iB_html/non-cgi/emoticons/new/smile_m_32.gif[/img]

    Jason

    Ps. I thought evaporative cooling only cuts the temps by only a few degrees C?

  6. #14

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    Thanks for the comments Jason!

    While that is true, with lights off, temps fall 1-2*C, then the AC cools another 2-3*C, with the evaporative reducing even a few more. Certainly I won't use this for my villosa, rajah, aristolochiodes, etc., maybe some people can use it for slightly less demanding areas...

    Also, PVC is relatively cheap, as are the fans. You should be able to buy two fan setups for aroun $18 USD, and enough PVC for about $5 USD.
    Thanks
    ~Lithopsman~
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