Bokakob 2" mini-still column

Vapor, Liquid or Cooling Management. Flutes, plates, etc.

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Yummyrum
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Re: Bokakob 2" mini-still column

Post by Yummyrum » Sat Aug 31, 2019 5:17 am

That all makes sense to me Expat :thumbup:

WithOrWithoutU2
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Re: Bokakob 2" mini-still column

Post by WithOrWithoutU2 » Sun Sep 01, 2019 8:48 pm

Expat wrote:
Sat Aug 31, 2019 3:11 am
WithOrWithoutU2 wrote:
Fri Aug 30, 2019 8:43 pm
Expat wrote:
Fri Aug 30, 2019 7:24 pm
I figure I can create the lieberg with 1/4 tubing running through 3/4 tube. Place caps on it, drill holes, run the 1/4 tubing through it.
3/4 is definitely too large over 1/4. The result won't be all that efficient. Consider 1/2. Cheaper on the material.
Are you saying 1/2 is actually more efficient at cooling a 1/4 tube? I have the 3/4 already, but would get the 1/2 it it would be more efficient.
Yes.

The goal is to maximize the flow of cool water against the surface of the inner tube and delay it's departure so it picks up lots of heat. Given the opportunity, water flow in the cooler will be though the area of least resistance i.e the center and avoid the drag of a surfaces, where you want it. An optimal cooler would force the water flow to stay directly on the surface of the inner tube, and introduce as much turbulence as possible to slow it's passage, even under pressure.

A 1/4" gap is commonly discussed as optimal due to assembly and material tolerance reasons. 1" over 1/2" has similar considerations to what you have planned.

For additional turbulence, many people including me will spiral wrap a piece copper against the outside of the inner tube, and solder in place. This both increases surface area and turbulence, which ups the efficiency further. Makes for tight fit but works great.

In the end, for a bok a PCs efficiency isn't as critical as a pot still liebig but a cooler product means (as mentioned) less loss and easier hydrometer readings.

Just thinking also, the weight of 1/2" with water will be a lot less than 3/4 and therefore the stress on the take connection will be more manageable.
:thumbup: Sounds good. I'll get some 1/2 and run the 1/4 through it.

Vinegar run done. Worked out well. No PC yet so the product was HOT. But I was running as fast as it could collect (about 1 cup every 5 minutes). The vapor condenser was getting about 1.15 liter per minute. A tad on the acceptable low side but I think I can improve it a little with tweaking my plumbing from pump to the condenser.

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