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Post by Donkey on May 11, 2008 1:58:00 GMT -8
Just wondering if something like this could be passively aspirated (no blower)??  |
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Post by Donkey on May 11, 2008 2:37:13 GMT -8
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Post by canyon on May 11, 2008 10:22:34 GMT -8
I think so. Just not sure what the advantage would be, although being a pyro I'd love to fire and tinker with such designs as well. The basic model rocket from the book is a downdraft pyrolizer already tuned for the purpose of clean combustion and positive pressure generation to harvest the heat effectively after. A downdraft gasifier is generally tuned for later combustion in an internal combustion engine. What would a naturally aspirated version be used for? If it needed to generate positive pressure to go through a mass bench I would think it would be very challenging to balance. Would the Aprovecho rocket feed be used to start(light) the secondary combustion and maintain secondary air flow after that or would you constantly be stoking the horizontal feed tube? Many heat generating gasifier designs I've seen have a propane torch or something similar to start flame in the secondary combustion area until it is up to temp to maintain flame. I love this sketch and post stuff. My wife's printer I think has a scanner but I'm not sure I can get there from here!  |
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Post by Donkey on May 11, 2008 13:28:44 GMT -8
The idea came from a sauna that I want to (someday) build. I want to stick wood in the thing outside and have the hot spot in the center, looking quite a lot like a Native American sweat lodge.
It quickly becomes apparent that the burn tunnel is far too long for this design.. The two stage gassifier could solve this problem, effectively stretching the burn tunnel out as far as it needs be. It seems to me that this may come up in other designs as well and it poses a challenge that could be fun to chew.
The Aprovecho feed would be used for starting draft and providing secondary flow, yes. There would probably be some kind of plug for it with an opening tuned for secondary air. I am (as usual) trying to stay away from propane use (or any other petro-chem fuel).
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Post by Donkey on May 11, 2008 13:32:09 GMT -8
Oh, umm.. I just sketched this one directly in Photoshop, no scanner necessary. I love my Wacom tablet!  If you dont have Photoshop and dont want to buy it, there is always Gimp. |
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Post by canyon on May 12, 2008 21:27:58 GMT -8
This super stretch rocket idea makes plenty of sense for the remote stoke sauna. Thanks for explaining the inspiration for the design as I was thinking you might of been using up the last of that special refracting cement bag. I too plan on building a round sauna but with half sauna/ half changing room with the heat riser in the sauna and feed tube in the changing room using a basic rocket. I only wish ten years ago I'd heard the sound advice to build your sauna as the first building (maybe after an outhouse depending upon) so I wouldn't have to dream of building mine sometime soon while hiking a mile to my neighbors sauna once a week! But then again if I'd built it first ten years ago it wouldn't be rocket fired!  Wacom tablets and Gimp? Man this stuff is too out there for me.  |
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