[permaculture] Healing Hawk doesn't do enough observation
Keith Johnson
keithdj at mindspring.com
Tue Oct 9 22:08:41 EDT 2007
Tommy,
You may need to tweak your conclusions a bit more. Granted much wood is
poorly combusted, but it doesn't have to be. Consider this comment from
a review of Ianto Evan's book: Rocket Mass Heaters-Superefficient
Woodstoves You Can Build (and snuggle up to)
"The key feature of Ianto's rocket is a super-insulated internal
chimney, which he calls the "heat riser", which allows the wood to
completely vaporize and burn at temperatures up to 1100F, so that only
*steam and carbon dioxide* exit through the flue...*no ash, no creosote,
no chimney flue fires*! Actually, it's instructive and somewhat amazing
to smell(!) the exit gasses from a blazing rocket stove flue: no smoke,
just steam more like a laundry-dryer vent with a nice woody scent!
So a well designed rocket stove combusts as close to 100% efficiency as
anything I've seen. Why is this important, if wood fuel is plentiful?
For one, no smoke to pollute our air. But note also that more efficient
burning means more heat from less wood, hence less physical labor or
money spent acquiring fuel, more time for other activities (gardening,
reading, dancing, weaving, etc!)"
This is the point I tried to make about mass heaters in an earlier email.
Keith
Healing Hawk wrote:
> Again, I apologize. I was wrong about wood burning contributing to global
> warming. It contributes to air pollution, not to global warming.
>
> Air quality issues are why Holmgren talks about training firewood users,
> designing better stoves, and using sustainably produced charcoal instead of
> wood.
> Tommy Tolson
> Austin, TX
--
Keith Johnson
"Be fruitful and mulch apply."
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