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bullerjan stoves

 
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Location: Port Hadlock, United States
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I read and article on instructables.com about bullerjan stoves. i was wondering if there was a way to make it part rocket and part pipes around the outside to sent more heat into a room like it does.
https://www.instructables.com/id/Homemade-Bullerjan-Stove
might be interesting to see who can make it work.
 
master pollinator
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lorrie hughes wrote:I read and article on instructables.com about bullerjan stoves. i was wondering if there was a way to make it part rocket and part pipes around the outside to sent more heat into a room like it does.
https://www.instructables.com/id/Homemade-Bullerjan-Stove
might be interesting to see who can make it work.




I am not sure, but I really like the design. It work well in my Tiny House if it was scaled down in size.
 
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Location: Wellington, New Zealand
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What advantage does this have over a rocket stove? It just seems to be a metal combustion chamber lined with vermiculite that uses metal pipes to convect the heat into the room.  How is it improving the efficiency of combustion?
 
lorrie hughes
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Location: Port Hadlock, United States
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put the pipe idea on the outside of the rocket stove somehow incorporate them together
 
Graham Chiu
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Location: Wellington, New Zealand
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I'm unclear as to whether that would be a good idea.  The combustion chamber of a rocket stove should be heavily insulated with fire brick, or ceramic fibre, to ensure maximum combustion of volatiles.  The only time people surround the combustion chamber  with metal pipe is to provide heated secondary air for secondary combustion.  We know that the burning of wood is polluting so we don't want to reduce the efficiency of combustion by drawing heat off the primary combustion chamber.
 
Travis Johnson
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To me it seems the Rocket Mass Heater and Bullerjan Stoves are polar opposites.

A rocket mass heater by design is used to heat a mass that radiates it slowly, where as the bullerjan stove is designed to better radiate heat without having to have a fan on top of it.

In my experience, trying to marry the two of them would be counterproductive. That is because, generally in life, when you try to do so, you get a product that does neither action well. Like sheep for example. I have dual purpose sheep, they have better fleeces then meat-only type of sheep, but are also smaller then meat breeds of sheep in carcass size. Wool sheep have even better fleeces, and meat sheep are bigger in size. Mine sheep do both better, but not the best.

In this case I think a person has to determine their lifestyle and make a choice of stoves based upon that.

For me, despite heavily researching them, a Rocket Mass heater would not work for me, but the Bullerjan Stove would. But that is me, my home, and my lifestyle. For others it is different.
 
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I think it would be necessary to locate such bullerjan-style air heaters well away from the hottest parts of the RMH, for obvious reasons. Even if the heat wasn't sufficient to slag the metal, it wouldn't take much for RMH-temperature burns to overheat even a moderate space.

I think they might be of use a bit into the mass part of the RMH, where you'd unplug the tubes for some airflow to heat the air in the room, taking the heat energy from the mass. Once the air temperature is sufficiently high, the tubes get plugged so as to not make it too hot.

For an RMH, I like the idea of having a thin ceramic or clay tile structure that creates an air space within, with closable vents at floor level, and at the top of the clay or ceramic "screen." This would add a ceramic air heater to the RMH riser casing, taking excess heat from the outer mass of the RMH by warming the air.

-CK
 
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I love that stove design.  I just emailed the link to a machinist friend.  I don't know how to weld well enough to build this, so I offered to buy all the parts for two if he will build them for us.  Crossing my fingers...
 
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