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Old 06-20-2013, 01:06 PM   #1
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Default Immersion coil for fermenter chilling

Hey Y'all,
I've been toying with the idea of a new way to control the temp of my fermenter in the summer .

I use a Blichmann fermenator (14.5 g) and the plan is to buy another one of the
oval hatch-doors for the lid, and insert a stainless tubing coil into the wort.

I plan on buying a PID, and a small fountain pump, and use either
a) switched pump, and a Peltier device chilled water reservoir , or
b) constant pump, and switched Peltier device. (favored)

I wonder about BTUs though

thoughts?

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Old 06-21-2013, 10:36 AM   #2
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With a thermowell and a temp probe/controller running the switched pump, sounds cool.

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Old 06-29-2013, 08:54 PM   #3
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I think a switched pump with a cooled resovoir will probably be a little more efficient, but keeping a fermenter cool with a peltier will be pretty tough. You'll probably have to get it to temperature with another method, and just use the peltier to maintain. Add lots of insulation around the fermenter as well.

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Old 07-01-2013, 03:16 AM   #4
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I really think the key to tight control is going to be a continuous running pump, and a closely controlled (coolant) temp with a PID. Besides, I cant see a PID trying to control a pump.

I could be wrong though, I have no experience with the johnson controls devices, and something like that might be suitable for controlling a pump.

I'm wondering if something like this would do the job for the reservoir ....maybe a PID would do a good job controlling the water temp inside .
http://www.amazon.com/Koolatron-P9-T...ectric+coolers

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Old 08-10-2013, 01:28 AM   #5
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Hey Y'all,
I wanted to update you on this ...
I bought another trap-door for the top of my fermenator, and wound 18 feet of 3/8" copper tubing into a double helix coil (2" inner coil, and 3.5" outer diameter coil).

I bored a couple 3/8" holes in the hatch, and silver-soldered the coil pigtails through the hatch (copper to stainless).

I bought one of the STC-1000 temp controllers and wired that up to an outlet box so I have a heater outlet and chiller outlet.

At this point , I'm chilling the fermenter with ice-water from cooler, via a controller-switched fountain pump. This works well but it's not the final cut.

Next batch:
I plan on running the pump full time, and switching 250 watts of on-the-fly-cooling Peltier devices. Basically, I'll pump out of a 1-2 gallon reservoir constantly, and through a thermoelectric-cooled water block . I hope to see 40f degrees coming out of the water block...this goes straight into the immersion coil inside the fermenter. Then out of the immersion coil and back to the water reservoir.

I'll post some pics when I finish up (and it works)

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Old 08-10-2013, 02:55 PM   #6
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Looking forward to the pics and working results!

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Old 08-10-2013, 07:04 PM   #7
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Hate to burst your bubble but you don't want copper in your beer once fermentation has started

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Old 08-10-2013, 08:30 PM   #8
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Quote:
Originally Posted by OMJ View Post
Hate to burst your bubble but you don't want copper in your beer once fermentation has started
OMG is right, you have to use stainless steel. I am doing this with a brewhemoth. I am using a STC-1000 to control a pump in a cooler that I load with frozen water bottles. It keeps the temp within .3 degrees Celsius.
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Old 08-10-2013, 10:42 PM   #9
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Crap...! The copper completely slipped by my brain. They are right, SS would be much preferred with this application! Otherwise you could risk toxins that wont be cleaned up by the yeast. Copper pre fermentation it beneficial though... Still, interested in the final outcome of your project.

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Old 08-10-2013, 11:07 PM   #10
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Contact Zach at Stainless steel brewing, he made my immersion coil for my fermenter, I went with a reservoir chilled with an aquarium chiller and a pump. I can get the reservoir down to 38 and that can cool the fermenter to 64-62ºF.

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