## Thumper/Slobber Theory

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• Thanks to Warren, David, Deb and Jessie Duke I think I ve finally got this Thumper / slobber business worked out, using the Ethanol-Water equilibrium graph
Message 1 of 5 , May 1, 2000
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Thanks to Warren, David, Deb and "Jessie Duke" I think I've finally got this
Thumper / slobber business worked out, using the Ethanol-Water equilibrium
graph (as shown at http://www.geocities.com/kiwi_distiller/theory.htm ) as a
basis.

Does this sound feasible ?

* Say initial mash is a 10% brew. The vapour coming off is around 93
C and 55% purity. This passes into the thumper keg, and bubbles into a
small amount of cold water in the bottom of it. Initially the water will
absorb much of the alcohol in the vapour, and possibly also much of the
water present too, depending how much contact there is between the steam &
water.

* The liquid in the thumper begins heating up, and also increasing in
% alcohol.
* After some time period, the two will approach equilibrium - say
(absolute guess) 40% alcohol & 84 C.

* Beyond this point, any additional heat coming into the thumper will
be causing alcohol vapour to come out of the liquid, but this is now at 80+
% (eg the 170-190 proof that Deb is getting) because it is effectively
coming off a thumper wash which is at 40%. Thus a second distillation
occurs in the thumper.

Where i was wrong before in my thinking .... I couldn't see how there was
enough heat coming in, to cause the thumper to do the second distillation.
But ... the incoming steam is still at 93 C, whereas the outgoing vapour
only needs to be at 84 C - so it can cool a little, and still be hot enought
to work. In addition, the incoming steam is a greater flowrate than the
outgoing vapour (because of the change in alcohol concentration), so again,
it will have surplus energy.

The incoming steam won't simply just bubble through the liquid and keep on
going (at a low % purity), because of the cooling due to heat losses from
the thumper area. This would then become a control on how pure the final
distillate is - a cooler thumper would give a higher purity final
distillate, provided it didn't too cold (eg stuck below 78 C) and stop
working. This is also why you wouldn't heat the thumper - if you did this,
all you'd get would be very low purity distillate (as per the temperature on
the graph).

The thumper will slowly be filling with liquid (mostly water, but saturated
with alcohol); thus the need to have either an overflow (as described by
Warren) or enough capacity. This liquid will be high in %alcohol, so don't

Gees - took me while to get there, didn't it. Thanks for all your patience
during this,

Tony
• Close :) You fill the thumper about 1/3 full (this would vary with your setup) of your first runnings (lower alcohol content but still around 100 proof give
Message 2 of 5 , May 1, 2000
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-----Original Message-----
From: Ackland, Tony (CALNZAS) [mailto:Tony.Ackland@...]
Sent: Monday, May 01, 2000 9:49 PM
To: Distillers@egroups.com
Subject: [Distillers] Thumper/Slobber Theory

Thanks to Warren, David, Deb and "Jessie Duke" I think I've finally got this
Thumper / slobber business worked out, using the Ethanol-Water equilibrium
graph (as shown at http://www.geocities.com/kiwi_distiller/theory.htm ) as a
basis.

Does this sound feasible ?

*      Say initial mash is a 10% brew.  The vapour coming off is around 93
C and 55% purity.  This passes into the thumper keg, and bubbles into a
small amount of cold water in the bottom of it.  Initially the water will
absorb much of the alcohol in the vapour, and possibly also much of the
water present too, depending how much contact there is between the steam &
water.

*      The liquid in the thumper begins heating up, and also increasing in
% alcohol.
*      After some time period, the two will approach equilibrium - say
(absolute guess) 40% alcohol & 84 C.

*      Beyond this point, any additional heat coming into the thumper will
be causing alcohol vapour to come out of the liquid, but this is now at 80+
% (eg the 170-190 proof that Deb is getting) because it is effectively
coming off a thumper wash which is at 40%.  Thus a second distillation
occurs in the thumper.

Where i was wrong before in my thinking ....  I couldn't see how there was
enough heat coming in, to cause the thumper to do the second distillation.
But ... the incoming steam is still at 93 C, whereas the outgoing vapour
only needs to be at 84 C - so it can cool a little, and still be hot enought
to work.  In addition, the incoming steam is a greater flowrate than the
outgoing vapour (because of the change in alcohol concentration), so again,
it will have surplus energy.

The incoming steam won't simply just bubble through the liquid and keep on
going (at a low % purity), because of the cooling due to heat losses from
the thumper area. This would then become a control on how pure the final
distillate is - a cooler thumper would give a higher purity final
distillate, provided it didn't too cold (eg stuck below 78 C) and stop
working.  This is also why you wouldn't heat the thumper - if you did this,
all you'd get would be very low purity distillate (as per the temperature on
the graph).

The thumper will slowly be filling with liquid (mostly water, but saturated
with alcohol); thus the need to have either an overflow (as described by
Warren)  or enough capacity.  This liquid will be high in %alcohol, so don't

Gees - took me while to get there, didn't it.  Thanks for all your patience
during this,

Tony

• thanks Deb, ... whew !! ... how much does it hold ? Tony
Message 3 of 5 , May 1, 2000
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thanks Deb,

> Close :)
whew !!

> You fill the thumper about 1/3 full
how much does it hold ?

Tony
• How full you fill it depends on the length of your copper pipes going in and out of the thumper. If its too full it either takes too long to heat (or can not
Message 4 of 5 , May 1, 2000
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How full you fill it depends on the length of your copper pipes going in and out of the thumper.  If its too full it either takes too long to heat (or can not possibly be heated by the vapor coming into it) or your thumper liquid is forced into your condenser.

Deb Brewer

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-----Original Message-----
From: Ackland, Tony (CALNZAS) [mailto:Tony.Ackland@...]
Sent: Monday, May 01, 2000 10:54 PM
To: Distillers@egroups.com
Subject: RE: [Distillers] Thumper/Slobber Theory

thanks Deb,

>  Close :)
whew !!

> You fill
how much does it hold ?

Tony

• Our pot is 5 gallons and we cook about 2 1/2 gallons of mash. The thumper is about 1 gallon and we add about a quart of liquid to it. Yield is 2-3 quarts of
Message 5 of 5 , May 1, 2000
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Our pot is 5 gallons and we cook about 2 1/2 gallons of mash.  The thumper is about 1 gallon and we add about a quart of liquid to it.  Yield is 2-3 quarts of 170-190 proof product.  Not sure how good this is but I think we're doing alright considering the method :)

Deb :)

-----Original Message-----
From: Ackland, Tony (CALNZAS) [mailto:Tony.Ackland@...]
Sent: Monday, May 01, 2000 10:54 PM
To: Distillers@egroups.com
Subject: RE: [Distillers] Thumper/Slobber Theory

thanks Deb,

>  Close :)
whew !!

> You fill