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Post by pabloook on Apr 23, 2017 16:55:47 GMT -8
Hi there. Been building mass heaters, and this starting winter in the southern hemisphere is the fourth i'm dedicating to this activity. Our (see hacono.com) line of work involves J rocket stoves BBR stoves, which have become our preferred type of combustion chamber since 2015, building several BBRs with brick bell, barrel and/or oven. October 2016 we built a BBR10 in San Pedro, Argentina. Last April 2017, we built a BBR13 in Trevelin, Province of Chubut, Argentina. Building such a beast involves a lot of energy and presents new challenges. We'd like to share the experience written in the PDF report you'll find in this link. Hope you enjoy it: www.hacono.com/project/reporte-bbr13-estufa-secadero-madera-en-trevelin/Pablo Kulbaba
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Post by Deleted on Apr 24, 2017 6:43:59 GMT -8
Nice work Pablo,
In your opinion, why was 11,25 times the base value needed for the Riser ? I would have bet on much less for such a big BBR ! It's surely possible that the leaky ashtray door may add to much air, thus creating an overfueling in the Riser.. but why did you add an ashtray?
And why this system of tubes and not an empty brick wall for example ?
Anyway, very impressive beast and it's good to see some detailed reports.
Regards,
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Post by pabloook on Apr 24, 2017 12:03:39 GMT -8
Thanks for the words, Yasin. -In your opinion, why was 11,25 times the base value needed for the Riser? POK: We saw flames (other than plasma) coming out of the riser when it was 7,5B, so we decided to extend it 1 more barrel to contain them. Building such big BBR we knew we might need to trust our guts. -It's surely possible that the leaky ashtray door may add to much air, thus creating an overfueling in the Riser.. but why did you add an ashtray? POK: The ashtray was built because in February we lit the BBR10 so as to check the burn rate, and noticed that if you want to have continuous fire in a BBR (instead of burning batches), you have to deal with ashes and carbon burn. So we decided to add an ashtray so as to be able to remove ashes with the fire going on. In fact, to keep it human scale, we divided the astray in two drawers. So, the left ashtray was built departed from specifications (the metal work was done by someone who already had lots of things to deal with and couldn't give the project the proper attention) so we got that leaky left drawer. This is the BBR10: -And why this system of tubes and not an empty brick wall for example? POK:To make the project real, we had to give a workshop so as to teach people to build their own house scale BBR. With theoretic presentations. The practical part of the workshop was the build of the BBR13. So, to keep it in short time span, we decided to use something fast to be built. That's why pipes. And to hace very fast heat transfer, instead of the inertia of bricks. My guess is this problem might have had different solutions. Regards.
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