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allenb
OfflineAdmin
· 04/02/2020 4:50 AM
Morning Ed, I haven't done any green coffee hoarding yet but am hoping the supplies don't end up like the toilet paper isles!

snwcmpr
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· 03/31/2020 2:53 PM
Hey Ed. Thanks. roar

homeroaster
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· 03/31/2020 11:21 AM
Hey quarantined home roasters! I hope you have great coffee! If they have a run on coffee, I hope you're set with your great home roast! Find me on Facebook! Ed Needham

snwcmpr
Offline
· 03/25/2020 11:49 AM
New Rochelle in the news. I think of you every time I hear it. ... Please stay safe.

allenb
OfflineAdmin
· 03/21/2020 7:36 AM
Good morning homeroasters morning Everyone is hopefully staying healthy through this. Hang in there and stay safe!

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Burner or Heating element BTU's/KW
allenb
Here's a rough first draft of a chart showing batch size versus an estimate of BTU's/Kilowatts needed. This is not based off of any scientific or mathematical models but is from examples of various roasters in production from several companies.

Dan's factor of 1.52 when increasing batch size times 2 seems to be close with some in the list.

These numbers are taken only from drum roasters with powered exhaust and typical fluidbed roasters. Infrared to bean roasters will probably require less kw per lb. if not using powered exhaust.

Please post any additional examples you find out there and I'll add it to the list or alter any numbers that are way off.

Fluidbed--------------------Drum

lbs--- BTU's---KW---------lbs---BTU's---KW
1-----10200--3kw---------1----6800----2kw
2-----17000--5kw---------2----10200---3 kw
5-----25500--7.5kw-------5----17000---5kw
8-----34000--10kw--------8
10----40800--12kw-------10---35700---10.5kw
12----47600--14kw-------3k

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
oldgearhead
If you can reclaim enough RC heat to maintain 150F at your blower inlet,
you will only need 1.2-1.5 KW to roast one pound to full-city in 12-13 minutes:
1) Drying = 4 minutes @ 1200 watts + 20% reclaim
2) Ramp to First Crack = 4-5 minutes @ 1700 watts + 40% reclaim
3) Finish = 4 minutes @ 1360 watts + 20% reclaim
oldgearhead attached the following image:
dsc_7371.jpg

No oil on my beans...
 
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