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Thread: Airconditioning

  1. #9

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    Joe, are you talking about a water cool system that cools computer or lab equipment
    George McKay

    In The End We are All Dead
    Florida

  2. #10

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    No, I wasn't planning on using water plates and pump. Simple is easier for this method, I'm just going to blow a fan across a peltier cooled heat sink mounted through the top of the tank.

    joe
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  3. #11

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    "...3. If you're using artificial lighting then use ventilation on the lights! This is a must if you're using any high output lighting (i.e. metal halide or high-pressure sodium) and is reccommended even if you're using flourescents ... just direct a fan to blow under the lights on the top of the terrarium. This will make a dramatic difference in the temperature in the terrarium. If you want to get the most value for your money then also direct the hot air out of a window ... this will ultimately reduce the ambient temperature around the terrarium...."

    My highland terrarium is about 120cm x 60cm x85cm. I use a 70W high pressure sodium light and I have to HEAT(!!&#33[img]http://www.**********.com/iB_html/non-cgi/emoticons/wink.gif[/img] it during the days if no sun hits the terrarium. Temperature raises only about 2C because of the 70W high pressure sodium light and this is placed directly upon the terrarium (with no glass betewenn the lamp and the plants).

    Good high pressure lights do NOT (!!!!!&#33[img]http://www.**********.com/iB_html/non-cgi/emoticons/wink.gif[/img] produce more heat than flourescent lights if they have the same wattage. (where should the heat come from [img]http://www.**********.com/iB_html/non-cgi/emoticons/confused.gif[/img])

    Highland plants need cold nights but usually quite warm days and so heat is for me (here in Germany) absolutly no problem during _the day_

    I have very big problems with cooling at night, because in summer ambient night time temperature in my room sometimes is more than 20C. Evaporation cooling will drop the temperature not more than 1-2C, an experiment with peltier elements was absolutly desastrous (temperature didn't drop more than 1C but it consumes a lot of power).

    My advice would be a cold room if possible. Heating during the day is _a lot_ easier than cooling during the night.

    If you have to cool the terrarium I would highly recommend superb insulation.

    Martin

  4. #12

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    Martin, the trick with peltier chips is to have an excessively large heat sink on both sides and large fans. They can cool quite wll, but it does take a bit of designing. Exactly what was your setup?

    joe
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  5. #13

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    Hi,

    I DID use very large heat sinks and fast running fans on both sides of the peltier element to get the heat and coldness away (the heat away from the terrarium of coarse ;-) )

    It didn't work. Maybe it is satisfieing with a smaller and better insulated terrarium than mine but you will still ahve the problem with water condensing at the cool side. Thsi is lowering humidity and also permanent dropping of ice-water isn't very good for the plants.

    Martin

  6. #14
    Tony Paroubek's Avatar
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    Loss of humidity is an issue with any type of artificial cooling system. Any time you have warm humid air flowing over a cold surface you will get condensation.

    SO if you plan on using an air blown remote (outside the terrarium) peltier or standard compressed gas type refridgeration you should also plan on a humidifier system with humidistat control in the return line to the terrrarium. If the evaporator or peltier are within the terrarium itself it is less of an issue as any moisture will simply drip back into the bottom of the terrarium and you will get a more natural cycle of condensation/evaporation.

    Lots of good ideas here but I would like to add more. Converting a chest freezer, refridgerator, or for a smaller scale a peltier cooled icechest. The hinged door/lid can be replaced by a piece of glass or plexiglass. The rest of the unit is very well insulated which will cut down on cooling expense dramatically.
    Tony
    Is that a Nepenthes in your pocket or you just happy to see me?

  7. #15

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    Tony, excellent idea, I have already priced medium sized fridges and found them to cost around $120 at home depot. Good price large enough for most any collection. I'm yet to find one that I think would look good laying on its back, but I'm looking. Must explore all options before investing.

    joe

    I do however strongly recommend this method to others as it is very easy and cost effective in both initial purchase and overall energy cost.
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  8. #16
    Tony Paroubek's Avatar
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    I would contact Jeff at Plantswithattitude.com
    He grows his ultrahighland plants in a converted chest style freezer. I am sure he would have some suggestions based on his experiences with this type of set up.
    Tony
    Is that a Nepenthes in your pocket or you just happy to see me?

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