Harry mentioned this some time back...
Shotguns as a final condenser:
Shotguns do perform better as final product coolers, where they
replace the lower performing Liebig condenser design. But they must
be angled at 45° to the vertical for correct product/coolant surface
heat exchange. Think of them as a multi-tube Liebig and you get the
picture. But again this usage is best where the final product is in
liquid form before being fed to the final condenser. If fed as
vapour, then you'll still get that old inefficiency problem because
the length of the thing is too short and the vapour has gone through
before full cooling/condensing can be achieved. The result will be
Now I want to produce a pot still shotgun condenser using 1/4" tubes.
The question I have is: Has anyone done the calculations or ideas regarding the minimum length of the tubes? Sure there are many variables however at a certain length all the tube will be doing is cooling a liquid not dealing with a phase change. The tube will have to do a bit of both of course. At the moment I am thinking 150 mm (6inch) would be OK.
Any input would be most welcome.