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  1. #1
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    Confused Mini greenhouse temperature controll

    So, i started this project with growing chilli-peppers.

    I shall make a mini greenhouse, and i have figured out artificial sunlight and ventilation, i am also planning on adjusting the temperature so it can go both above and below the surrounding temperature.

    I will try to hold the daytime temp at 70F and the night time at 55F by using peltier eliments.
    The greenhouse shall have 24/7 ventilation (except if the humidity gets too low).

    The problem is that i dont know how to keep the temperature up while having 24/7 ventilation...

    I have thought of a watercooling based system, where the peltier modules warms/cools a water loop which warms/cools a radiator at the ventilation intake, but its got to be a easier way?

    Please help.
    Thanks

  2. #2
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    heat recovery ventilator (HRV)
    Col 3:23


    questions asked, answers received, ignorance abated

  3. #3
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    I usually see hanging unit heaters in greenhouses. I've also seen boilers for a water loop in the dirt.

  4. #4
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    Unhappy Not enough room

    Quote Originally Posted by Red Man View Post
    I usually see hanging unit heaters in greenhouses. I've also seen boilers for a water loop in the dirt.
    As i mentioned its a mini greenhouse (dimensisons(LxWxH): 45x30x40)

    I dont think i have room for any of the things you just said

  5. #5
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    LxWxH in cm

  6. #6
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    Oh, that is mini! What can you fit in there, one pepper plant?

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  8. #7
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    17x11x16" roughly

    Peltier heaters? If you're rich enough to run those dont skimp on the rest of the controls. The pull AMPS and you realize they have a COLD side opposite the HOT side, too, right?
    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"
    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

  9. #8
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    Quote Originally Posted by HVAC_Marc View Post
    17x11x16" roughly

    Peltier heaters? If you're rich enough to run those dont skimp on the rest of the controls. The pull AMPS and you realize they have a COLD side opposite the HOT side, too, right?
    Yeah i know that, but i cant think of any other cooling solution (minimum 60F)

  10. #9
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    Quote Originally Posted by Eirikki View Post
    Yeah i know that, but i cant think of any other cooling solution (minimum 60F)
    small aquarium chiller with glycol filled tubing running around inside the mini house

    http://www.drsfostersmith.com/produc...FQqJaQod9jAEgg
    Last edited by HVAC_Marc; 10-03-2016 at 12:18 PM.
    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"
    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

  11. #10
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    Hmm

    Quote Originally Posted by Red Man View Post
    Oh, that is mini! What can you fit in there, one pepper plant?
    Actually 9, its just for seed to 25cm growth, the rest happens outside, the plant is then more "robust"

    Quote Originally Posted by HVAC_Marc View Post
    small aquarium chiller with glycol filled tubing running around inside the mini house
    It whould work... but is a very expensive solution
    And i probably should mention that i dont care about the power draw, only the equipment price because i dont pay the electrical bill, i live in a college, and they dont monitor our power draw.

  12. #11
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    Quote Originally Posted by Eirikki View Post
    It whould work... but is a very expensive solution
    And i probably should mention that i dont care about the power draw, only the equipment price because i dont pay the electrical bill, i live in a college, and they dont monitor our power draw.
    Are you stealing the peltiers? they're expensive too, for high wattage versions. And, they will know, when they start blowing breakers and all of a sudden have a MAJOR power increase.
    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"
    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

  13. #12
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    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
    -------


    Quote Originally Posted by Eirikki View Post
    Yeah i know that, but i cant think of any other cooling solution (minimum 60F)
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  14. #13
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    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
    -------
    pretty much what i suggested...

    my dad did this for a small aquarium. it doesnt work as well as you think it might.
    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"
    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

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