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Post by satamax on Oct 5, 2019 11:55:08 GMT -8
Hi everybody!
On my 220mm batch workshop Heather, i have approximately 11 m³ of bell so far. With the oven modification, lately. I have my chimney temps, which has risen from 90/95 mid burn, on the first burn. To 120/125 at the same time in the first burn.
Do you think i could add 2.7 m² of flue in a bench upstairs?
Stack effect convection will still happen between bottom bell's exit, and upstairs, 3.5 meters above. At 120c. After the bench, i will have about 3 meters of chimney.
Thanks guys.
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Post by peterberg on Oct 6, 2019 0:23:13 GMT -8
It might be that the gas velocity has gone up due to the modification. In general I've found stack temperature of 60 ºC within 20 minutes from starting cold is enough to prevent a chimney stall. In mid burn between 80 and 100 ºC as highest temperature works for me 100% of the time.
With the above in mind, in your setup there's some slack left. Whether or not a 2.7 m² bell bench is too much is anybody's guess. Maybe you could try it and have a tune-able feature built in? Something like a plunger tube to the rest of the chimney?
Whatever you do, please keep all passages wide and spacey so you won't create unwanted friction.
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Post by satamax on Oct 6, 2019 0:48:54 GMT -8
Hi Peter.
Thanks a lot for the reply.
Well, for the tuneable feature. I am thinking about a small bypass between second bell and the chimney, before it goes upstairs.
When i reach , let's say, 120 out of the upstairs bench, i would switch the full bottom bell on.
Something along that way.
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