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Topic: Drum & forced air >was Re: +Sumatra and a Newbie (17 msgs / 427 lines)
1) From: Mike McGinness
From: "Rick Farris" 
<Snip>
here,
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No, but I can emulate it quite well with extremely slow bean movement and 15
to 25min controlled Rosto roast:-) Which actually leads to a question I've
been meaning to ask. Commerical drum roasters like a Dietrich have
adjustable forced air circulation through the drum. (Not for bean movement I
don't think, drum does that. Heat distribution I believe.) Do the Alp & or
HotTop have forced air moved through the drum during roast and if so is it
adjustable? Are BBQ drum roaster builders incorporating this feature?
(haven't heard it mentiond)
MM;-) aka Kona Konnaisseur miKe mcKoffee
Dual Variable Transformer Rosto Roasting
Rocky grindin' - Miss Silvia brewin'
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2) From: Ben Treichel
Actually I've been wondering what makes a drum roaster, a drum roaster. 
Is it the contact with the hot metal? But then what about SS screen 
drums? They all use hot air to heat with (no contact). Or is it the 
smoke re-circ that adds a bit of a differnt flavor?
Ben
Mike McGinness wrote:
<Snip>

3) From: floyd burton
Still not quite clear what a BBQ roaster is-to me they are those things that
are used to smoke meat.  But here goes on my gas grill roaster-it is a
char-broil and the thing has 3 ea 15K btu output burners-when just above the
lowest settings they get my grill up to 475 and when on high can get it to
over 500F.  There is a large opening in the back of the grill which is just
above the roasting drum and the hot air and smoke pour out of this
opening-so yes there is a significant amount of air flow thru this thing.
Don't know what additional air flow would do-am able to get just into second
crack in 16.5 minutes.  The brew made from my second batch is very good
despite being very inexpensive beans-can't wait till I learn enough to try
some really good SM beans. In a few weeks will write this adventure and post
with pics on Ed's site.  What fun.

4) From: floyd burton
This is a multi-part message in MIME format.
Good question-do all commercial drum roasters have holes in the drum?  Don't
think the hothow's do-they are cast and no easy way to make small holes in
cast.  But the ends are relatively open I think.  Hmm  My drum is solid with
a maybe 75 holes about 1/8" in diameter so beans won't fall out.  Course I
have some small gaps in the ends but not large enough for beans to fall
out-so this drum must roast mostly by contact while the SS screen drums are
mostly heated by air.  Wonder what difference this would make-if any.

5) From: Ed Needham
Dan Nathan used a fan in his Meco/Frontgate BBQ grill roaster.  it was a
Dremel Occasional Fan inserted into the grill.  He said, "I like the fan.  I
can live with the fan.  But it's one more thing to mess with."http://www.k-point.com/page/drumroaster2.htmScroll down about half way.
Ed Needhamhttp://www.homeroaster.comed
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6) From: Ed Needham
That is a rhetorical question, right?  You're just thinking out loud, and
really don't want an answer, right?  Geesh, why not ask which is the best
coffee .
The answer 'has' to be 'all of the above'.  Metal contact, air circulation,
agitation, smoke, air temperature, etc.
Blowing forced air though a bean mass is way different than tumbling beans
through gently flowing heated air.  I'd like to figure out a way to build a
cast iron drum.  Maybe that will be my next project...hmmmm.
Ed Needhamhttp://www.homeroaster.comed
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7) From: Ed Needham
Reply #2
In my BBQ grill roaster, turning at 30 RPM, I'm thinking the four 1 1/2" high
stirring vanes, the length of the drum, and the coffee beans themselves
probably move quite a bit of air even without a fan.  I need to try it when
the roaster is cold to see how much airflow there might be.  I bet it's
fairly significant.
Ed Needhamhttp://www.homeroaster.comed
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8) From: dewardh
Ed:
<Snip>
I was just waiting for you to ask . . .  . . .http://www.pscipco.com/Deward
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9) From: Rick Farris
This is a multi-part message in MIME format.
Exactly.  There is no way in the world that a fluid bed roast is in any way
the same as a drum roast, no matter what the overall timing.
-- Rick

10) From: Mike McGinness
From: "Rick Farris" 
<Snip>
way
<Snip>
Are you so sure? Have you compared roasts side by side? All "fluid bed"
roasters and they're designs are not the same. The Rosto does not fluidize
up from the bottom but rather from the center pillar giving the beans a slow
circular motion. Not the customary fluid bed shooting up bean spout dance.
The stainless steel roasting chamber applies part of the heat to the beans.
The Rosto recirculates part of the air exhaust back through the roast
chamber.
MM;-) aka Kona Konnaisseur miKe mcKoffee
Dual Variable Transformer Rosto Roasting
Rocky grindin' - Miss Silvia brewin'
<Snip>
Is
<Snip>
They
<Snip>
I'vebeen
<Snip>
Silvia
<Snip>
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11) From: AlChemist John
Sometime around 03:53 PM 1/16/2003, Mike McGinness typed:
<Snip>
Mind you, you really did not ask me but my non bbq drum roaster is 
incorporating forced air for the sake of improved (but not excessive) heat 
transfer and chaff removal.
--
John Nanci 
AlChemist at large
Roasting and Blending by Gestalt
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12) From: Ed Needham
Yeah, yeah, yeah...rub it in.  You and your bad SF roaster .
Ed Needhamhttp://www.homeroaster.comed
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13) From: Mike McGinness
Are you saying our Alchemist has a SF? How'd I miss that most covetous fact!
MM;-) aka Kona Konnaisseur miKe mcKoffee
Lowly Dual Variable Transformer Rosto Roasting
Rocky grindin' - Miss Silvia brewin'

14) From: AlChemist John
Sometime around 16:05 1/17/2003, Ed Needham typed:
<Snip>
??  Science Fiction roaster??
--
John Nanci 
AlChemist at large
Roasting and Blending by Gestalt
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15) From: AlChemist John
Sometime around 17:56 1/17/2003, Mike McGinness typed:
<Snip>
It probably has something to do with the fact that I missed it too :-)
I was referring to the drum roaster I am designing and building.  What were 
you referring to Ed?
--
John Nanci 
AlChemist at large
Roasting and Blending by Gestalt
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

16) From: Ed Needham
Now I've got to figure out which homeroaster it was that bought the small SF
roaster.  I thought it was you.  Possibly someone on alt.coffee.  I now
remember you talking about that back in November in a rotisserie RPM thread.
Ed Needham
To Absurdity and Beyond!http://www.homeroaster.comed
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17) From: Rick Farris
Mike asks:
<Snip>
Why yes, in fact, I have. :-)
-- Rick
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