Search found 24 matches

by allenb
July 30th, 2022, 11:25 am
Forum: Coffee Roasting
Replies: 0
Views: 115

Siemens Sirocco Power Level Adjustment

{image} I came across a post by DucaiMann in 2019 regarding modding a Sirocco to allow control of power level. I'm sure by now you have already done all the modding desired and located the power level adjust potentiometer which is accessible via the small opening behind the timer dial. While the Sir...
by allenb
May 6th, 2018, 10:50 am
Forum: Coffee Roasting
Replies: 57
Views: 6363

Drum Speed

Good question. A stab at this would be that there might be a sufficiently hot layer of air close to the skillet or whirly pop's surface. Scorching and tipping also happen in convective-only roasters when there is insufficient agitation. I agree. In giving more thought to how much conductive heat tra...
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by allenb
May 1st, 2018, 8:56 pm
Forum: Coffee Roasting
Replies: 57
Views: 6363

Drum Speed

From what I gathered from the paper, regardless of how many times a bean may come in contact with the drum surface, due to the extremely small contact area, it would be impossible to transfer the amount of heat needed to be much of a factor. To make sure we're on the same page, I was referring to an
by allenb
April 30th, 2018, 8:31 pm
Forum: Coffee Roasting
Replies: 57
Views: 6363

Drum Speed

After reading Mbb's post citing Boltzmann and Planck and the impossibility of an IR emitter or drum surface in this case, at a surface temperature between 450 and 600 F, to be able to transfer enough energy to pull off a roast, I contacted a reputable infrared heater manufacturer product rep/enginee...
by allenb
April 29th, 2018, 8:58 pm
Forum: Coffee Roasting
Replies: 57
Views: 6363

Drum Speed

Hi Jim. As far as the 450 to 600 F internal drum surface temp (6-10 microns), my own IR thermometer measurements through a large front opening in my 1 lb drum roaster (6-10 microns is the wavelength of any emitter at that temperature). As far as IR being dominant, convection second then conductive. ...
by allenb
April 29th, 2018, 5:56 pm
Forum: Coffee Roasting
Replies: 57
Views: 6363

Drum Speed

#16:Post by renatoa ยป Apr 27, 2018, 4:58 pm Renatoa Posted: "Actually the conductive part of the roast is another myth that has no support if analyzed thoroughly". "The radiant coming from the drum wall, and convective from the beans tumbling in the air are much more important than pure conductive h...
by allenb
December 6th, 2014, 8:15 pm
Forum: Coffee Roasting
Replies: 11
Views: 1306

Sirocco Roaster Missing Parts

It would be a real long shot for the grinder hopper to work as a roast chamber on your Sirocco. Can the metal base be easily removed? If it can then the angle of the unit would need to be just right to not bottom out before making a seal. The diameter of the bottom would need to be close
by allenb
November 30th, 2014, 4:44 pm
Forum: Coffee Roasting
Replies: 11
Views: 1306

Sirocco Roaster Missing Parts

The glass roast chambers are almost impossible to find as most Sirocco owners know it's only a matter of time before their's ends up in pieces. So even the few who have more than one will usually hoard them to have a backup. After breaking mine a few years ago I was lucky to find a scientific glass ...
by allenb
July 6th, 2014, 8:38 pm
Forum: Coffee Roasting
Replies: 12
Views: 3122

What is this roaster?

Unimax 2000 {link} {link}
by allenb
May 14th, 2014, 8:35 pm
Forum: Coffee Roasting
Replies: 122
Views: 8492

2014 HB Home Roasting Competition Discussion Thread

Big thanks to Jim, Henry and all else who helped organize and manage this event! Also, thanks Henry for encouraging me to participate. Allen Bartee