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Rocket Ratios for through the wall system?

 
Roberto pokachinni
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posted 8 years ago
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Hey there.  It's been a while since I started a thread, so I figured I'd give it a go again.  

I have an idea to put a sauna beside a insulated greenhouse with the feed tube and the mass bench being in the greenhouse, while the burn tunnel would pass under the shared wall so that the heat riser and barrel would be in the sauna on the other side of the wall.  There would also be a couple of windows in that wall to let excess sauna heat into the greenhouse, if desired.  This system would also keep the sauna clean of debris.  

So my question is, because the burn tunnel has to go under a wall, clearly it will be longer than normal to keep the barrel away from the wall, and because of that I'm assuming that the heat riser will have to be taller to match it with the ratios of a rocket stove.  I've seen double barrel systems so I'm thinking that this will probably have to be the case.  But what are the ratios?    

"Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it's the only thing that ever has."-Margaret Mead "The only thing worse than being blind, is having sight but no vision."-Helen Keller

 
Glenn Herbert
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posted 8 years ago
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Standard recommended J-tube proportions are 1:2:3 or (more recently) 1:2:4 feed tube:burn tunnel:heat riser.
 
Roberto pokachinni
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posted 8 years ago
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Thanks Glen!  

"Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it's the only thing that ever has."-Margaret Mead "The only thing worse than being blind, is having sight but no vision."-Helen Keller

 
Jeff Stainthorp
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posted 8 years ago
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Any progress Roberto? I'm planning a very similar project, I'd love to see how your design is coming along!
 
Roberto pokachinni
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I'm still in the gathering of materials and information.  I've got snow on the ground, and will be waiting for spring/summer to break ground on the project.  

"Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it's the only thing that ever has."-Margaret Mead "The only thing worse than being blind, is having sight but no vision."-Helen Keller

 
thomas rubino
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posted 8 years ago
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Roberto: Nice idea. Consider making the wall between greenhouse & sauna out of brick or stone , allowing your barrel to be much closer and having a shorter burn tunnel , that may allow you to go with one barrel instead of two.  You can space up that one barrel with bricks getting the room you need for a 50"- 60" riser.   With two barrels in your sauna you could have roof overheating issues .

For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!

 
Roberto pokachinni
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posted 8 years ago
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Thanks for the compliment on the idea Thomas, and thanks as well for the suggestions.  Yeah, I was thinking of stone for that wall... actually stone for the lower part of the sauna as well (been gathering and stashing stone at various places during slow moments at work [one of the few benefits of this job, when I'd rather be on my land], and will pick it up when I license my big truck in the spring).  As far as double barrel's and roof height is concerned, I was thinking of a high roof with tiers of benches, but the design isn't set in stone (so to speak, literally and figuratively) yet.  

u can space up that one barrel with bricks getting the room you need for a 50"- 60" riser.  

 Can you expand/clarify this comment, Thomas?  I'm not sure exactly what you mean.

"Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it's the only thing that ever has."-Margaret Mead "The only thing worse than being blind, is having sight but no vision."-Helen Keller

 
Roberto pokachinni
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Location: Fraser River Headwaters, Zone3, Lat: 53N, Altitude 2750', Boreal/Temperate Rainforest-transition
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posted 8 years ago
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Actually, now that I wrap my brain around it a bit, I think I do get that last part I quoted.  That would mean that the area below the barrel (which I think of in terms of being both part of the core and part of the manifold) would have to be built up higher than normal, to accommodate the higher riser.  Hmmm.  Does that mean that the bricks used would have to be firebricks, or just the burn tunnel coming into the zone, and the riser coming up?  Or could I use regular bricks/stone/or cob for this part?  I figure the latter group of materials would probably be adequate as it is a cool enough area... but figured I would ask.  

"Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it's the only thing that ever has."-Margaret Mead "The only thing worse than being blind, is having sight but no vision."-Helen Keller

 
thomas rubino
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posted 8 years ago
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Correct, build up a circular base for the barrel to sit on.  Regular clay brick will work fine in that location.  Should look good as well !

For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!

 
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