Ping Harisaki Re: Losses past a shotgun condenser.
Thanks for your kind thoughts and regards.
For your interest I did start with the 10mm strips of copper sheet
being twisted, with one full turn over 200 mm. I did not think this
would be enough twist to give turbulence and so I went for zig zag, as
The zig zag reduced the smell and losses, more than the twist, but not
enough. I did think to increasing the number of bends in the zig-zag
and also putting dens in the copper strip.
I would do an experiment with some heads in the boiler and exchange
out different tube packing. I could use my sniffer/nose to check out
I thought that this type of shotgun condenser was the ultimate. Other
distillers here I have read about use shotguns. I assume with small
tubes and success.
However, it seems I am the first with 13mm tubes.
If all else fails I can always build a new condenser.
Harry don't worry about the water flow it is greater than 7L per
minute and cold. Yes it does recirculate through a large heat exchanger.
--- In Distillers@yahoogroups.com, "Harry" <gnikomson2000@...> wrote:
> --- In Distillers@yahoogroups.com <mailto:Distillers@yahoogroups.com> ,
> "Harry" <gnikomson2000@> wrote:
> > Well my friend, there's only one option left in retro-engineering
> > that shotgun. Fill the tubes with copper mesh (scrubbies or
> > structured). But do it LOOSELY so you don't choke the vapour path.
> > Roll the mesh on a flat surface with your hand so you get a cigar
> > shape just marginally larger than the bore size of your tubes. When
> > pushed/teased into the tubes it will compress and hold in place. You
> > can also stop them from falling down with a small piece of copper
> > wire hooked through the top couple of strands.
> > After this modification, I strongly suggest to increase the volume of
> > water flow in/out the jacket. 6 litres per minute is not
> > unreasonable for this type of condenser, heat exchanging a 1400W
> > power input. Obviously with this volume going through, you will want
> > to recirculate the coolant water, unless you don't mind using 1500
> > litres of water in a spirit run.
> > If the suggested mesh insert fix doesn't do it (as in it's still
> > losing uncondensed vapour), then bite the bullit and make a new
> > condenser. If you choose to again use a shotgun design (would you?),
> > this time crimp the tubes for turbulence BEFORE soldering in place.
> > The shotgun design as a total condenser (overhead or reflux
> > condensers) is not truly satisfactory in my opinion. The big design
> > fault is that the pathway travelled by the vapour is the same pathway
> > travelled BACK by the condensate or liquid and in a small space. This
> > can cause liquid holdup and more problems. Shotguns are simple to
> > fabricate, but lacking in efficiency and performance as you have
> > discovered. Even simple coil condensers are more efficient as the
> > vapour and condensate occupy different areas.
> > Now if you turn the shotgun concept 90° to the vapour direction,
> > reverse the vapour & coolant duties of the shell and tubes, you have
> > a crossflow condenser, and that's a horse of a different colour. See
> > my crossflow design in my Library...
> > http://distillers.tastylime.net/library/BAPHS/
> <http://distillers.tastylime.net/library/BAPHS/> Page 10.
> I've done more research into your problem and have discovered that I was
> on the right track in retro-fitting your shotgun condenser. I've just
> had discussions on this shotgun efficiency subject at the Homedistiller
> forum and I've posted the relevant info there.
> The thing we are looking for is called "Turbulators". Go to this
> post/thread to see what it's all about...
> regards Harry