- Interesting about the sensitivity. I found that my gate valve in my VM
setup was also quite sensitive but easily manageable nonetheless. e.g.
quarter turn for foreshots, 1.5 tns for etoh.
Agree about inter-relatedness. If one thing gets changed you have to
do several more runs to re-learn the best parameters. Even just
stuffing a scrubber into the reflux coil seems to have altered my run
characteristics. I think I have probably got most things sorted now so
just have to get to maximum efficiency.
--- In Distillers@yahoogroups.com, "Mark" <markgofast@h...> wrote:
> The output valve off of the Bokakob SR separator was just too darn
> sensitive. 80% of max output came at 1/2 turn open.
> So, I added two cross tubes almost at the top of the column -
> plumbed in series with the main condensor - and fed with a 1 GPM
> pump drawing from a 30gallon trashcan of water (I probably don't
> have to, but I exchange the water once during the run). The main
> condensor is an 18" long cold finger with 8 fins soldered
> longitudinally to increase the surface area - and a couple of teased
> out scrubbers just to make sure that no vapors escape.
> Based on notes and max output vs. input power graphs, the cross
> tubes are providing 60% reflux at typical power levels. Now, a
> small change in the SR valve does not cause big changes in the
> What still amazes me in this "sport" is how one little change can
> affect all the other parameters. I'm still experimenting with
> insulated vs. bare columns. Right now, it looks like the purity vs
> output curve is higher with bare columns (inherently more reflux?),
> but it's almost the same curve as an insulated column IF the power
> is reduced (??? column choking???). And, darn little still
> operation data generated with water can be used for alcohol
> distillation. alcohol is multiphase, water is liquid/steam. The
> Cp's and specific heat of vaporization are very different.
> And another thing...... oh shoot. I'm rambling on and on and on
> --- In Distillers@yahoogroups.com, "Lindsay Williams" <linw@x> wrote:
> > What was the reason for having the cooling tubes if you could
> > reflux with the ER setup?
> > Cheers,
> > Lindsay.
> > --- In Distillers@yahoogroups.com, "Mark" <markgofast@h...> wrote:
> > >
> > > On my secondary still I had to add scrubbers around the cross
> > > to obtain some decent reflux. I figure the scrubbers increase
> > > surface area of the cross tubes and kill more steam than the
> > > tubes alone.
> > >
> > > This same still also has the Bokakob SR separator mounted above
> > > cross tubes to allow 0 to 100 reflux.
> > >
> > > Mark