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JackH
01/04/2019 10:55 AM
2 years today...Miss you Ginny!

JETROASTER
01/04/2019 4:24 AM
A little shout for the G'ster. 2 yrs. roar

allenb
12/27/2018 5:14 AM
Hi Brandon, please disregard the "please update". I think we're all up to speed now. The need for cache clearing get's me every time! limb

NetriX
12/26/2018 11:36 AM
Update? pouring Merry Christmas back atcha

allenb
12/26/2018 3:07 AM
Merry Christmas Brandon. Please update soon! christmas tree

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6kW Electric Air Roaster
greencardigan
It was from eBay. I don't have the exact ad any more but it was probably this one. Probably the 20cm one but I did order a few sizes and they're not very accurate.
https://rover.eba...3180401632
 
Estrangedinbaja
greencardigan wrote:

Next task is to build a chaff collector so I can roast non decaf without making too much mess.


Hey Greencardigan,
Did you ever figure out how to add a chaff collector to this?
 
greencardigan
I tried and failed! Shock

I bought two of the small aluminium cyclones from ebay but i think I have too much airflow for them to work properly. I was getting a reasonable amount of chaff passing through the cyclones.

I'm now reverting back to a simple mesh basket sitting on top.
.
greencardigan attached the following image:
img_20190110_073149.jpg
 
renatoa
Nice dual setup ! Why not install mesh at the cyclone air exit too, keeping the chaff inside.
Or, another take, why not mount the cyclone as series instead parallel ;) I mean pipe the output of first cyclone to the input of the second.
 
greencardigan
I think my problem was I was forcing too much flow through even with two in parallel. Two in series would be worse I think with greater restriction.
 
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CK
I have a small amount of chaff escaping the exhaust on the transparent roaster as well. My blower is putting about 17-19 cfm through the cyclone. I think that is in the acceptable range for the cyclone specs.

The chaff escape problem may be from not having a large enough (larger diamter) chaff collection container... I'd say 99% is contained on mine, which has about an 86mm inner diameter chaff collector. Renatoa's idea of a mesh sounds good if the collection container can't be modified.
 
renatoa
I am using this cyclone in a turbo oven setup, so air does not enter into cyclone by natural pressure from RC, but must be sucked using an external blower instead.
For this purpose I fitted a 10 cm / 20W inline hydroponics extractor fan that is rated for 140m3/hr ~ 82 cfm, that sounds enormous, but the feeling is not at all comparable with the airflow of a FB. Probably the specs of chinese ebay fan are fake.

Anyway, it does a good job as separation, no chaff thrown out until the chaff level approach the lower exit of the cyclone, that's the moment when it start to see sporadic flakes in the air. I am using a flour sieve in that moment, to cover the fan exit Grin.
 
greencardigan
I don't know what flow rate I get through my beans from my 600W vacuum blower, but the noise of the air whizzing around through the cyclones was probably louder than the roaster itself!
 
CK
Greencardigan, you're right they can be loud. In Canada, our 3/4" threaded copper pipe coupling (male or female) has an outer diameter just under 25mm. One can be placed into the top exhaust and it acts kind of like a muffler... in some way it changes the turbulence on the way out and quiets the whistle or whizzing sounds.

Here's an image with the specs for these cyclones to work as intended.
CK attached the following image:
cyclone_specifications_r1.jpg

Edited by CK on 01/14/2019 12:21 PM
 
renatoa
I don't understand the relationships between power and airflow, if any...
As I wrote, my exhaust fan specs are 20W only and 140 m3/h... completely off versus the cyclone.
So what fan should I use instead, for the best suction parameters ?
 
greencardigan
Here's my alternative chaff collector. It worked perfectly with very close to 100% captured. Sometimes the simple option is best.
greencardigan attached the following image:
screenshot_20190116-173430.jpg
 
renatoa
Hmmm... chaff is not only flakes, but a lot of dust too, almost flour.
I would place this sieve inside of an... "expansion" recipient, or at least inside an exhaust tube.
Will see what mess will build inside that tube, even in one month...
 
greencardigan
True, the smaller dusty bits could get through but I'm not too worried about that. I roast on the verandah of my apartment and just want to stop the larger visible chaff from drifting down onto verandahs below.
 
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