Heat gun and thermos coffee roaster

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By John Edgar Park
Posted 2010/09/24 @ 9:31 am
Category General

No doubt this guy in this video made some awful, over-roasted charcoal, but the rig shows promise. I really like the use of the thermos as an insulated chamber. With some tuning of the heat control (thermocouple probe and variac for the coils maybe?) you could probably get this slowed down to a more reasonable six-to-eight minute roast before first crack.

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5 Responses to Heat gun and thermos coffee roaster

Alan Blue on September 24th, 2010 at 10:10 am said:

“you could probably get this slowed down to a more reasonable six-to-eight minute roast before first crack.”

The part that amused me is that I was thinking “A piece of HVAC flexible ducting to recycle the hot air would make it -faster-.”

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- John Park on September 24th, 2010 at 10:23 am said:
  
  Haha! Slow down everybody!!
  
  Reply ↓
Dave on September 24th, 2010 at 11:17 am said:

Simply putting a power rectifier diode in series with the heating coil would probably be enough for a “Low” setting.
With a switch across the diode, the heat gun would retain its full original function.

Dave

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philliposophy on September 24th, 2010 at 6:57 pm said:

It’s a good idea to heat and then cool the coffee as fast as possible. 1:50 is obviously way too long, but this was probably shown as a proof of concept: from green to charcoal in a minute 50.
The thermos idea is great for heating quickly, but the cooling cycle should not take place in the same vessel. What cools hot coffee down _really_ fast is a few metal pans that’ve been in the freezer for a while.
Done right, this person’s set up could be amazing.

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Rahere on September 28th, 2010 at 9:27 pm said:

Connect the two tpgether and it’ll be starting to look more and more like a 12648430-cycle Stirling engine!

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