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Liester Roaster?
mk1
I'm in the middle of building a version of Dan's direct flame roaster. I've also been trying to read all the posts concerning roaster builds, roasting in general etc, (thanks for all the great stuff here y'all) and I suddenly realized I have one of these:
http://www.hotair...c-PID.html
This thing really throws out some heat:
Voltage 120 V/60 Hz
Output 1600W
Temperature Variable Temp. Setting
Produces hot air adjustable from 68F (20C) to 1292F (700C).
Adjustable temperature scale allows for proper selection of temperature to fit your application.
Air flow 230 liters/minute.

I'm thinking I might need additional air flow and I'm interested to know what anyone might think of what the maximum practical batch size would be? Any construction suggestion would be welcome as well.

Mark
Edited by JETROASTER on 12/03/2011 9:25 AM
mk1
Also, this might be a compact replacement for nichrome wire.
http://www.bestma...x?ID=16019

PRODUCT: #5-100-702, 120V 1600W REPLACEMENT HEATING ELEMENT.

MADE IN SWITZERLAND.

1-YEAR WARRANTY.


APPLICATIONS: FITS BAK RION, LEISTER TRIAC-S, TRIAC PID WELDERS.

TECHNICAL DATA:

Voltage: 120 Volts
Power: 1600 Watts
Frequency: 50-60 hz.
Heats to 650C.
CE marked and approved

OPTIONS: 230V 1600W element is also available.
mk1 attached the following image:
heater-100702-large.jpg

Edited by JETROASTER on 12/03/2011 9:40 AM
David
Wow, what a find!

Guestimating from the wattage, I'd say you could easily roast 1-2 lbs with this device, depending on your roast chamber design - insulation, etc.

Air flow control will definitely be a factor in modulating the heat delivered to the beans. You might get by with a passive design, but I would think in terms of incorporating some system of fans and dampers.

Sounds like a great project.
Please keep us posted. Send pictures, too.

David

mk1
David,
My leister has a decent fan but I'll have to cobb up a simple tapered tube of .019 aluminum to see if the 230l/minute can suspend the beans properly. I would guess there is enough heat for 1-2 lbs but probably only enough air flow for sub 1lbs. The really great thing is I believe I could bypass the heat control knob and move control to the TC4C from JimG.

Mark
JETROASTER
I converted that 230 liters to around 8CFM. Not so great for a fluid-bed, but for a drum that might be great. Good Luck!

-Scott
mk1
Thanks Scott, that save me from the test "tube" for a cfm check. I'll go to Dave's surplus site as they have some nice little squirrel cage blowers.

Mark
JETROASTER
This may be obvious but...increasing your CFM will drop your temp accordingly...so, for what it's worth.

Good luck! -Scott
David
I was thinking drum as well, not about lofting the beans.
seedlings
Can you shoot the Lister in some sort of enclosure to gauge how well it will heat a volume of air? I don't quite have a grip on what that device is. Spec'd similar to a heatgun but with much less air flow. Is it like a hair dryer?

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
oldgearhead
For an all electric fluid-bed roaster, I say the rule of thumb is 3000 watts/kilo. My roaster will easily roast one pound in less than 12 minutes
using one 1500 watt element. However, I must recycle more of the RC exit air as the ambient temps get lower. At 40F ambient, I am recycling 40% of the RC exit air. Both Chad(seedlings) and David (dja) use the the same element as I, but they use two and roast twice my batch size...
http://www.graing...Pid=search
--------------------------------------------------------------------------------
No oil on my beans...
mk1
OGH,

Thanks for the info, very helpful, I like the cost of your element compared to the Liester replacement element. How many CFM?

Mark
oldgearhead

Quote

mk1 wrote:
OGH,

>snip<
How many CFM?

Mark

I'm running a generic, 120V, one-horsepower Ametec-Lamb vaccum motor, in the 10-40VDC range. I believe Master Appliance heater elements are used on these roasters:
http://forum.home...ad_id=2207
http://forum.home...ad_id=1761
http://forum.home...ad_id=1905
No oil on my beans...
JETROASTER
I'm not always the sharpest tack in the box...so just for clarity....what kind of machine is being built? -Scott
seedlings
It's hard to beat a $14 heatgun for usefulness, price and availability.

http://www.harbor...96289.html
www.harborfreight.com/media/catalog/product/cache/1/image/370x/9df78eab33525d08d6e5fb8d27136e95/i/m/image_11971.jpg

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
mk1
Scott,
My lights might not be of the brightest kind either, so I can't answer your question just yet. I've been reading through many of the builds here on the forum and am amazed at the creativity and technical know-how. I've been reading a late into the night and usually want to build whatever I've been studying. My first build is the Dan, direct flame variant I've been working on. I'm probably still 3 weeks or so out on an initial trial run.
After that it's a fluid bed or bubble bed fluid roaster and that's what I'm doing the background work on. I really enjoy process and a technical/mechanical challenge, but not to challenging...

Mark
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