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permaculture - Fwd: [permaculture] the hydrogen argument/wood

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  • From: Marimike6@cs.com
  • To: permaculture@lists.ibiblio.org
  • Subject: Fwd: [permaculture] the hydrogen argument/wood
  • Date: Fri, 20 Jun 2003 09:03:11 EDT


--- Begin Message ---
  • From: Marimike6@cs.com
  • To: john@eco-living.net
  • Subject: Re: [permaculture] the hydrogen argument/wood
  • Date: Wed, 18 Jun 2003 19:41:05 EDT
In a message dated 6/18/2003 4:57:49 PM Eastern Standard Time, john@eco-living.net writes:
>Masonry stoves are pretty good, using about half the wood of a metal
>stove.

Plus they can burn coppice and 'scrap' wood - best designs burn it hot for
low emissions, and quick, but hold most of the heat generated and release
it slowly, as with the Aprovecho designs Toby mentions.

High-temp combustion (like the 'rocket' stove and others on the Aprovecho
site) and masonry/mass heater principles can be combined very low-tech and
cheaply.

Take a high-temp combustion chamber design and capture the heat from the
exhaust in cob mass before it exits the building.  The exhaust can zig and
zag some, as it does in masonry heaters, so that as much as possible of
the heat is absorbed by the cob.

These can be built right into cob or part-cob structures, and
'retrofitted' into any kind of building.  I've seen - and felt the mellow
warm glow from - one in a very mainstream house structure that used to
have a typical inefficient fireplace.

In northern Russia they call this a Dutch furnace, and it is in fact a very, very efficient device because it burns anything, as you say (up there they use a lot of peat) and because the ceramic retains the heat all night. A typical one is maybe five by eight feet, and the whole family sleeps on top of it at night, with a few blankets underneath you to keep from toasting your tush. That's how they got through the Middle Ages.

M.E.


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