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renatoa
03/29/2024 1:55 AM
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HGDB imitating drum-roaster profile
kahveuno
I like to share my HGDB (heatgun dogbowl) temperature profile.
I used HGDB method for nearly 6 months, before I build my drum roaster. I tried several roasting profiles with the HGDB method and the profile I was using in my recent roasts was aiming to imitate a drum roaster profile.
My heatgun has an electronic temperature control which allows me to adjust the blowing air temperature in 10 degrees centigrade steps.
For my particular setup,
* dogbowl has a mass of 300gr
* roasting batch is 125gr or less
* heatgun power is 2000W(max)
* airflow of the heatgun is always at maximum setting
* ambient air temperature is between 20C and 25C
And the profile for the heatgun air temperature is:
* start at 400C
* check the color of the beans (check for yellow)
* usually yellow occurs at or before 2 minutes.
* drop temperature to 200C, keep for 3 minutes
* after 3 minutes, increase temperature 30C (i.e 230C @5minutes approximately)
* repeat same after 3 minutes (260C @8minutes approximately)
* at 11 minutes make it 290C and keep it at 290C until the end of the roast.
* my manual logs show that first crack occurs somewhere after 13:30 minutes and second crack around 16 minutes.
* I usually stop before second crack using the smell/smoke (not too much smoke)
* dump the beans and cool

This profile gives a high heat at the beginning, which is similar to a preheated drum. The tasting results were usually not as bright and complicated as a drum roaster profile but satisfactory.
https://twitter.com/#!/KahveUNO
 
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