April 24 2017 08:12:15


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View Thread » BUILDING A ROASTER » Fluidbed Roaster
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Oreck XL blower and Popper heating with recirc
I finally received some fine screen to use in place of the cloth vacuum filter that pretty much clogs up after each roast and has to be replaced with a clean 5" disc. OGH recommended 120 mesh, but could only find 100 mesh so used that. After two successive roasts this morning, it looks clean enough to go at least 5 or so before cleaning. Big improvement in air flow - Thanks OGH!

For some reason my line voltage at max power has dropped from 115VAC to 111, but at ~1600 watts, I'm still able to steer a 300 gm charge along a target profile for both what I prefer for pour-over / cone brewing and the somewhat darker roast my wife likes for her espresso. She prefers roasts that are just into 2C. In this system, in-chamber cooling is very rapid.

I've attached data log profiles for the two I did this morning along with photos that I hope will illustrate differences in color. I decided to throw in a Charbucks espresso roast shot for comparison. After trying Lavazza Super Crema and some previous roasts I did, she says she now notices the charcoal flavors in the Charbucks she'd been drinking for the past 10 years.

I've been getting up to right around 180F on the blower motor outlet case temperature by the end of each roast running on 100% recirc, nowhere near the resettable thermal fuse or upper limit I set for the microprocessor to monitor. That whole component of the design turned out to have been unnecessary, but I guess it's better to be safe than sorry.
ChicagoJohn attached the following images:
three-roast-comparison.jpg lighter.jpg darker.jpg

Edited by ChicagoJohn on 04/18/2017 08:40
So many beans; so little time....
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