neoplasticity wrote:
thinking of maybe using concrete mixed with vermiculite and hand shaping the burn chamber and the rocket burn chamber out of this vermiculite concrete.
neoplasticity wrote:
ok, i'm having a hard time finding the metal tube I need to build this and I understand that the vertical rocket part of this needs to be well insulated. So I was reading up and thinking of maybe using concrete mixed with vermiculite and hand shaping the burn chamber and the rocket burn chamber out of this vermiculite concrete. Maybe I could use some chicken wire or hardware cloth as a form to mold the concrete over. I can get a bag of concrete for 2 dollars and vermiculite for less than 20. Then I get a dryer duct for the exhaust for 10 dollars and find a barrel and Im in business!
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Echoing Erica Wisner's clarification for all to be able to see:
"What Ernie meant to say is you CAN'T scale down too far. Drag overcomes draft."
In 10+ years of subsequent experience, it has been found that a 4" J-tube RMH is barely possible under optimal conditions, but is often tricky and unreliable. Smaller than 4" gets so small that it cannot function in a practical way.
From dana annex rocket stove plaster |
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From ernies pics |
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Muzhik wrote:
Would it be possible/efficient to paint the barrel black, then build an open latticework of brick around the sides of the barrel?
"the qualities of these bacteria, like the heat of the sun, electricity, or the qualities of metals, are part of the storehouse of knowledge of all men. They are manifestations of the laws of nature, free to all men and reserved exclusively to none." SCOTUS, Funk Bros. Seed Co. v. Kale Inoculant Co.
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jaime merritt wrote:i just finished building a very small rocket heater. i used 3" pipe and so far it works very well. i made some videos of the build here,
http://www.youtube.com/watch?feature=player_detailpage&list=PL01FFC7A3CB99848B&v=4QbTzU-MG5s
cheers. Jaime.
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Erica Wisner wrote:
I would probably use carpet tube where you had the white plastic form, burns out a little cleaner, but the fittings are pretty slick.
I think you may have accidentally made aluminum silicate, a high-temp refractory material, from your concrete and the perlite (it's a silica-rich glass foam). Or maybe it's not accidental - your version of 'lazy' is a lot like other people's 'resourceful'.
Our shop heater that Ernie's dad made was a lot less work than yours, but didn't look as awesome either. I love the 'firefighter's nightmare' styling, quite a statement.
Pocket rocket diagram: feed, bucket/30-g barrel, chimney. Can cob, insulate, or put bricks in the bottom for weight stability. Not quite as clean as the updraft-downdraft, but this down-up model makes a good radiant heater.
On the main topic:
When we say 6" for rocket mass heaters, we are talking about the ones that heat a thermal mass after the combustion unit. You might get away with a tiny thermal mass, or a vertical chimney.
The fireplace-insert mass heater would need a small liner all the way up the chimney, or you might get downdrafts of exhaust in the chimney as cold brick cools the exhaust.
For a small rocket-style stove or pocket rocket, where you have no more convolutions on the exhaust than a woodstove, you can get away with very small dimensions. We've done mini-cookstoves with steel drink cans, or a tea stove with a 3" chimney in refractory ceramic: Image is too big, so visit on our blog: Ernie and Erica's Joint Adventure: Oysturkey and the Tea Stump
-Erica
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jaime merritt wrote:
i see now what you are referring to when you talk about laminar flow. mine and similar designs get additional draft from the vertical, thin walled, chimney. running the gasses through a long run in a thermal mass causes too rapid cooling and loss of draft. is this correct? i like the tea stump! very cool. i haven't seen to many designs for a rmh with a more vertical mass (think masonry heaters), it seems to me that if that configuration works well it would be easier to fit into a retrofit/remodel situation. my next project is a rocket water heater for a hot tub. ill post that in another thread. cheers. Jaime.
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jaime merritt wrote:i just finished building a very small rocket heater. i used 3" pipe and so far it works very well. i made some videos of the build here,
cheers. Jaime.
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