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snwcmpr
09/18/2019 4:09 AM
JavaBob ... You will get more response if you post a question on the forum rather than the shoutbox.

Mathew
09/17/2019 5:50 AM
check out the Hive Roaster!

JavaBob
09/16/2019 4:03 PM
Has anyone used a Leister hot air blower to roast coffee and if so, which model did you use? What was your experience like?

JavaBob
09/16/2019 3:53 PM
Source for customable borosilicate glass cylinders for use as a roasting chamber?

shoron
09/06/2019 7:25 AM
how to make medium raw colored beans to dark ?

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Drum Roaster Heat Transfer to Beans
allenb
A discussion has been ongoing at HRO and other sites about what mode of heat transfer is dominant between conduction, convection and infrared from drum wall depending on specific drum roaster designs. I have contended that with single wall drum, with electric or gas heat being directly applied on the outside of the drum, that IR (infrared), radiating from drum to bean, is dominant over the other two modes and that with all drum roaster designs that heat transfer from conduction is always minimal due to the lack of sufficient contact area of coffee beans.

Still needed to be able to determine to what extent this may or may not be the case, is an accurate reading of drum wall temperature at various locations during a roast. If anyone is able to accurately measure this with a reliable and calibrated IR thermometer, please post your results here and any and all discussion related to this topic is desired.

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
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