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  #11  
Old 07-29-2020, 03:39 PM
Draikan Draikan is offline
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This thread has some pretty good discussion of how you might go about building a chilling system: Peltier Water Cooling Block for Chilling Substrate - Dendroboard
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  #12  
Old 07-29-2020, 04:26 PM
DirtyCoconuts DirtyCoconuts is offline
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i double thank you!

i am now firmly of the mind that i will NOT cool the tank but insulate it well and increase ventilation a small amount to get more of the house air to circulate with the tank air.

then i'll just hope i didn't get any orchid too picky LOL
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Old 07-29-2020, 04:41 PM
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Originally Posted by Draikan View Post
Hey, I'm an electrical engineer with a background in robotics and control systems. I usually work with motion control, but also have experience with temperature, humidity, light, etc. Been keeping miniatures for a couple years after getting hooked on dendroboard. I saw this thread and thought I should jump in!

Others have touched on it already, but cooling is complicated. Temperature, pressure, humidity, and airflow are all related. Try to control or modify one and you probably mess up two others! It is possible though.

The first step is to limit the amount of cooling you need. Drop the ambient temp of the room as much as possible (or use a basement if you can), then insulate the tank as much as possible. Minifridge is a good start, you can also look at wine coolers since they tend to come with a glass door. Cork and great stuff expanding foam are also great insulators, so backgrounds made from these materials will help.

Peltiers really have two problems for this application.
1) They are small compared to the size of the tank you are trying to cool. So they have to remove all the heat leaking in from all the walls of the tank. This is why you need to insulate those walls!
2) They are not efficient coolers. This means that It takes a large amount of electrical energy to remove a small amount of heat energy from the tank. You can think of a peltier cooler like a heat "pump". You give it some electrical energy, and it "pumps" some heat energy out.

Evaporative coolers, and refrigerators can both be more efficient. Heat pump and refrigeration cycle - Wikipedia

I'd recommend looking into aquarium chillers (especially used) as a cheap way to get a lot of cooling power. How you use all that cold water to cool down the air without messing up humidity is another problem!

Hope this is helpful.
Welcome to the Orchid Board! We are always glad to have expert input.

I mentioned the ice chest method because making ice in a freezer built for that is probably a much more efficient cooling method than anything a hobbyist would put together... and physically carrying ice from the freezer to the cooler is probably more efficient than other methods of providing heat sinks....
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  #14  
Old 07-29-2020, 05:33 PM
Draikan Draikan is offline
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Originally Posted by estación seca View Post
Welcome to the Orchid Board! We are always glad to have expert input.

I mentioned the ice chest method because making ice in a freezer built for that is probably a much more efficient cooling method than anything a hobbyist would put together... and physically carrying ice from the freezer to the cooler is probably more efficient than other methods of providing heat sinks....
Thanks! Ah that makes sense. Cooler full of ice/icewater is pretty equivalent to the chilled water coming from an aquarium chiller, but way simpler! Ice water from a cooler would be a great start for chilled tank experiments.
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Old 07-29-2020, 05:50 PM
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Thanks! Ah that makes sense. Cooler full of ice/icewater is pretty equivalent to the chilled water coming from an aquarium chiller, but way simpler! Ice water from a cooler would be a great start for chilled tank experiments.
Check what carnivorous plant people use for growing Heliamphora species. I'm not an expert but I've drooled over them a lot.
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Old 07-30-2020, 12:59 PM
MJG MJG is offline
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Wow, just have to say thank you for great information all of you are providing! This thread is so helpful.
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