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Homeroasters.org » BUILDING A ROASTER » Fluidbed Roaster
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Oreck XL blower and Popper heating with recirc
ChicagoJohn
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....
 
ChicagoJohn
With a 20A autotransformer to boost my line voltage up to 120VAC now, I am working my way up to see what the maximum capacity will be. Today I did a 340 gm Sumatra Mandheling from Happy Mug from a cold start and because the 1C was quite a bit later than I'd been seeing (374F), I decided to take it a bit longer to about where my wife prefers them for espresso. I did a print-screen on the eee-PC I'm using for data logging.

Maximum blower exhaust temp reached 180F where it's been running for several previous trials. I used 1.7kW; 14A at 120VAC with about 3A for the OreckXL motor. There is a 20A fuse in the autotransformer and the breaker on this circuit is also 20A.

So everything is looking pretty good and I'll try and make a YouTube video this coming week. Thanks again to all for sharing your experience and ideas which I was able to use to get this far.
ChicagoJohn attached the following image:
sumatra-mandheling-happy-mug.jpg

So many beans; so little time....
 
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