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Post by Donkey on Aug 27, 2007 8:52:52 GMT -8
Wildfire hazard has me on hold, expectant, looking forward to winter. In the mean time I daydream.. One thought: Rocket heated, cob sauna...  |
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Post by Donkey on Oct 11, 2007 10:35:10 GMT -8
HOO HOO!! The rains have come at last.. A bit inconvenient in other ways but he hee (evil laugh), my fire season has started.  |
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Post by rhyddid on Jan 18, 2009 15:47:17 GMT -8
got any further with this one?
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Post by Donkey on Jan 18, 2009 16:48:39 GMT -8
Sadly, no..
Economic downturns and other realities of life have placed this one on the back-burner.
I have been messing with the heat riser component though.. That tapered heat riser i've been going on about.. I've cast one and am waiting for it to dry..
I'll post it all up before too long.
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Teach
Junior Member
Posts: 89
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Post by Teach on Jan 21, 2009 18:59:37 GMT -8
Yo Donkey I have to ask kuz this is a different app...............why not two barrels instead of one? Or for example; have the regular rocket mass heater setup with the barrel etc.............but add another barrel or heat exchanger as per aprovecho's designs? You could probably build a smaller system with larger heat output! Win win!
Teach....
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Post by Donkey on Jan 22, 2009 5:15:30 GMT -8
You mean sort of like Peterberg's double bell?? Sure, could be done.. My concept above is all about keeping everything ultra small so the double barrels seem a bit big... The original concept here uses one single 16 gallon (or there-abouts) steel drum. I'm looking to tune it to dump massive amounts of heat at the top of the drum. No storage or mass in the plan, just one cherry hot surface to splash water on. Aprovecho's been messing with heat exchangers?? Didn't know.. Show me.  |
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Teach
Junior Member
Posts: 89
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Post by Teach on Feb 7, 2009 15:54:42 GMT -8
Donkey; bioenergylists.org/stovesdoc/apro/Heat/Heating%20Stoves%20LO-RES.pdf On page 41 of this pdf there is a heat exchanger that could be built out of two barrels or similar cylinders. In the illustration on page 41 it shows the flue gasses entering the bottom of the heat exchanger and exiting out the side at the top. You could place a unit like this in line between the barrel of the rocket heater and the chimney. Connect the flue exit from the rocket at the bottom to the second heat exchanger via the side rather than from the bottom as illustrated allowing the second heat exchanger to stand directly on the floor rather than directly above a wood stove vertically. The entry on the side wall of second heat exchanger would be near the bottom and the exit on the sidewall near the top. That is the thing that would need to be changed. The second exchanger would pull out the heat into the room from the gasses that would normally heat a battery. If you used a hot water tank liner, it could easily be less than 18 inch diameter and 2-5 feet high. Approvecho not only produced this document on wood heaters but also has another on wood fired cookstoves as well. Both available from the site I posted the link to. Teach..... |
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Post by canyon on Feb 7, 2009 23:54:48 GMT -8
Wow! Thanks for that link! What a great reference! |
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Teach
Junior Member
Posts: 89
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Post by Teach on Feb 8, 2009 15:57:31 GMT -8
Canyon, you are most welcome. That paper the link takes you to is one of the first I read on the subject of heating with wood. Unlike for cooking, there does not seem to be much written in english on heating with wood.
Donkey, hope this makes things a little more clear as to what I was talking about. Hope you can make use of it and if so glad I could help.
Teach....
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Post by philk966 on Feb 16, 2009 13:19:21 GMT -8
Greetings Donkey, I've been contemplating a cob sauna and found your drawing inspiring. I have the remains of an old barn (actually just half the stone foundation) with a concrete slab covering half the floor surface. There is an old manure trough cast into this slab. It's approx. 6" deep by 18" wide and about 20' long. I'm wondering if I could incorporate your pass through idea using this trench. I'm not sure how thick the slab is , and realize I'd have to figure out a way to insulate the floor. I'm also wondering if the the concrete would have a problem with the high temps.
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Post by Donkey on Feb 21, 2009 3:48:26 GMT -8
Greets philk966,
Sure, why not?
Yep, the concrete will heat-shock in high temp conditions. Still, it can be safely used as the intake portion of the pass-through and, possibly, hot outputs once they've cooled somewhat.
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