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By murrkywaters
Posts:  326
Joined:  Wed Sep 02, 2020 2:39 pm
#366520
My setup for highland plants is nonexistant, does anyone have a good design for a highland grow chamber? I was thinking about using peltiers and a water based heat exchanger so I could keep the hot side far away from the plants. Water has a good heat capacity and provides humidity, so I thought it might be a good place to start.

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By murrkywaters
Posts:  326
Joined:  Wed Sep 02, 2020 2:39 pm
#366523
Well, I need a more permanent setup for my helis, and I was thinking of expanding into the world of highland neps over the next year or so. No solid plans yet but having a hamata or edwardsiana is up there in terms of goals. I'd really like to seed grow as much as possible

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By murrkywaters
Posts:  326
Joined:  Wed Sep 02, 2020 2:39 pm
#367647
This is a 4 peltier cooling unit. I've got a water block on the hot side and fans on the cold side

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By murrkywaters
Posts:  326
Joined:  Wed Sep 02, 2020 2:39 pm
#367652
Here is the other side. I was thinking I could use the got side to warm a seedling tray if it's not scalding. Image

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By murrkywaters
Posts:  326
Joined:  Wed Sep 02, 2020 2:39 pm
#367666
Jose, you don't know me or my background, so I want to give you the benefit of the doubt. Please don't just jump on to my posts to be the contrarian, unless you've run the math. There are four TEC1-12706 peltier devices providing me a drop of a theoretical maximum of 8° C below ambient for 20L of space. Since the enclosed space is 1 ft³ or roughly 29 L I can expect probably closer to 5° C with all other imperfections accounted for. Assuming the ambient temperature of the grow tent is 85° F or 29° C that temperature drop should take it down to 24° C during the peak temperature of the day. Factoring in for the greenhouse effect is where the math gets tricky. Fortunately I've been running an experiment over the last week and it turns out keeping a reservoir of water in 32° C weather outside in direct sun resulted in minimum of 4°C increase from the daily minimum 20° C the peltier cooling unit is probably overkill but I have a programmable thermocouple and microcontroller coming so I can set a range for it to operate in. I'm also waiting on a waterproof power supply that can deliver the theoretical 288 W. The real test will be when I power it on. Seeing as there has been reports of success with just two TEC1-12706 units, I think it'll be fine. If you have some disagreements with my math, please show me where my error is. I'm always up to learn something new. Otherwise I'll ask you kindly to find a different outlet for your negativity.



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By jose
Posts:  69
Joined:  Fri Oct 09, 2020 8:18 pm
#367694
Negativity? :roll:

I know several people who have attempted peltier cooled setups without success. Just saying to keep us posted if you have luck
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By murrkywaters
Posts:  326
Joined:  Wed Sep 02, 2020 2:39 pm
#367695
Numbers friend, or your input is useless. What units were they using? How much volume were they trying to cool? How was the chamber insulated? Were the peltier devices set up in a heat pump? Series or parallel? How were the peltier devices mounted? Do you see what I'm saying?

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By jose
Posts:  69
Joined:  Fri Oct 09, 2020 8:18 pm
#367713
No I don’t see what you’re saying because I’m not the one making the peltier cooled setup and I never attempted to. To the best of my knowledge it’s not often successful from what I hear. Specifics I do not know so then my input is “useless.” It’s sad that you think my comment of it not being successful often but telling you to keep us updated as an encouragement is somehow negative
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By murrkywaters
Posts:  326
Joined:  Wed Sep 02, 2020 2:39 pm
#367714
I say that because without those details I'm unable to learn from their failures. It's like telling someone "good luck with your date tonight, people do get divorced, but still good luck" I couldn't do anything with the "people do get divorced" bit. This isn't the first post I've made that you've jumped on to to tell me I'm wrong without telling me why, so forgive me if I seem a little hesitant to accept your words of encouragement.

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