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10/17/2021 12:40 PM
Welcome, Ploni

10/15/2021 2:19 AM
merlot85, maycondelpiero and hoeltz, Welcome !

10/14/2021 10:06 AM
Thanks for the addition to the group. Seriously considering building a drum roaster along the lines of oldgrumpus's. Love the design and craftsmanship.

10/14/2021 4:00 AM
Morning, ar3mia ! and... coffee drink

10/12/2021 11:55 AM
Evan Slack and CupOfJoe, Welcome !

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Using a ring (regenerative) blower
progen
Has anyone used a ring or regenerative blower for their DIY fluid bed build and can you let me know the specs and batch weight?
renatoa
You mean the blower itself, or the air recirculation solution ?

Any full metal turbine blower should be appropriate for this job, if the motor is outside the turbine can, and cooled by an impeller.

From what I read, if the intake air for heater is 70 C degrees, the power required to perform the roast is halved. To have a reference, the air exhausted by my cyclone is 80 C degrees.

Hope it helps.
progen
Hi Renatoa, I meant for the loft blower itself.
CK
Here's a beauty! Sputnik3.
Fasten your belts and prepare for takeoff.



progen
Any idea of that blower's rating?
renatoa
Isn't the same as for a cold air unit ?
The fact the air is hot affects the power consumption only, I think... the airflow should be the same, to get same lift...
So the standard FB design guidelines are preserved.
CK

Quote

progen wrote:

Any idea of that blower's rating?


Not sure, but it is easily used for their 320 grams charge weight... it was shown running at 18% on the LCD2004 in the bottom video. I think it's always better to over design prototypes because it gives more headroom for experimenting on larger capacities.
progen

Quote

CK wrote:

Quote

progen wrote:

Any idea of that blower's rating?


Not sure, but it is easily used for their 320 grams charge weight... it was shown running at 18% on the LCD2004 in the bottom video. I think it's always better to over design prototypes because it gives more headroom for experimenting on larger capacities.


Thanks so much for that. I did manage to contact one of them and the blower was a 750 watt 1hp one. A blower of that rating can be had at around USD160 - 170 in my country. USD70 more if I want it right away because I live within walking distance of two blower specialists.

My aim is to build a 1.2 - 1.5kg green weight roaster so that should be plenty of power.
renatoa
I would try first a 500W leaf blower, they are very cheap, less than $20 here.
When attempted to use mine for 500 grams beans cooling the result was a tornado of beans in my whole kitchen... Shock

But... it's hard to find if the blower has metal turbine for these models... so the regen part is under question sign.
progen

Quote

renatoa wrote:

I would try first a 500W leaf blower, they are very cheap, less than $20 here.
When attempted to use mine for 500 grams beans cooling the result was a tornado of beans in my whole kitchen... Shock

But... it's hard to find if the blower has metal turbine for these models... so the regen part is under question sign.


Those blowers are even cheaper in my country. Can get a 750w one for USD10. When you used your 500w one, was it on full power?
renatoa
The model I tested has a simple on-off button, not a proportional trigger, so yes, at full.
Was just a capability test, immediately after purchase, just unpacked.
progen
Thanks for the information, Renatoa. I did look at many of them but decided to spend a bit and get a regenerative blower since it was on sale. 750W 1HP for slightly below USD150 to my doorstep. I was looking at the three phase one actually but with the VFD, it'd have come up closer to USD250 and I already had the inline dimmer so I went with the single phase version instead.
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