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  1. #14
    Join Date
    Sep 2002
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    Doesn't work well for what reasons? And with what negative factors to it's operation?

    PHM
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    Quote Originally Posted by HVAC_Marc View Post
    pretty much what i suggested...

    my dad did this for a small aquarium. it doesnt work as well as you think it might.
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  2. #15
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    Sep 2016
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    Unhappy Still expensive solution

    Quote Originally Posted by Poodle Head Mikey View Post
    Sure.
    Put a 50' coil of 1/4" plastic tubing inside a refrigerator.
    Put some coils of copper tubing inside the greenhouse.
    Connect the two loops together and fill them with water.
    Use a small aquarium pump or metering pump or something to circulate the water.
    Regulate the greenhouse temperature by adjusting the refrigerator thermostat.

    You could do it even cheaper and easier with a 2-3-5 gallon plastic bucket of water in the refrigerator. Drop in a submersible pump and bring the return line back from the greenhouse loop and direct that water back into the bucket.

    PHM
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    Yes but then you have to buy a refridgerator...

  3. #16
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    Sep 2016
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    Thread Starter

    Lightbulb

    Whould this solution work?

  4. #17
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    Sep 2016
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    Thread Starter
    (The radiator blows air into the greenhouse)

  5. #18
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    Sep 2016
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    Thread Starter

    Thumbs up


  6. #19
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    Sep 2016
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    I would turn on and off the peltier elements to regulate the temp

  7. #20
    Join Date
    Sep 2002
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    Just take the keg out of the one you already have. <g>

    PHM
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    Quote Originally Posted by Eirikki View Post
    Yes but then you have to buy a refridgerator...
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  8. #21
    Join Date
    Mar 2013
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    Billington Heights, NY
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    Quote Originally Posted by Poodle Head Mikey View Post
    Doesn't work well for what reasons? And with what negative factors to it's operation?

    PHM
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    There's not enough heat transfer on the tubing. *MAYBE* if the tubing was frozen in a block of ice but i think that's much more than an average bar fridge can do. My dad tried building a coil loop column with a fan circulator inside the fridge but it just didnt help much. It was for a 10 gallon aquarium with a single halide light above.

    The Peltier idea, while interesting, just doesnt have the capacity to do what the OP wants to do. A greenhouse has a massive load and loss. He's not going to have enough circuits to run ALL this electrical load. A basic $3 Peltier is 100 Watts at 12 Volts. That's 8.3 Amps for ONE Peltier unit. He's probably going to need at least 25 units to maintain the temps in the greenhouse. So, how many auto battery starter/jumpers can he run in his dorm room on one circuit? And add to that - pumps, fans, etc. The chiller is a much better solution.

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