[Stoves] Fire Stump

[rongretlarson at comcast.net]

Rob: 

Thanks for sharing these additions. Does anyone know if the unit first given by Jeff Davis had a "Rocket" design (horizontal hole) for air or whether the central hole might go all the way through to the bottom? 

I think these (both central hole and splits) could make for an interesting classroom demonstration. The points to make are 

1. that the energy from the flame anywhere is mostly captured.and used to keep the flame going on opposite surfaces. For the rocket shape, almost no radiant energy is lost. For the wedges, little is lost. None. of the narratives I watched (and there are a lot more than Rob has given) talked about the importance of radiant energy cappture. It would be fairly easy to pull the wedges apart in steps - and at some separation the flames would go out.- showing the importance of capturing this radiant energy. 

"Stumps" of different lengths but otherwise the same could show the chimney effect nicely. Might be able to control power level with a lower plug. 

2. In the Rocket (central hole design) it would have been good to have someone show flame control by partially closing the lower air supply. Might be able to find a way to relate air hole size (and air volume) to power level 

3. It would be interesting to see if a TLUD design could be operated with a set of secondary air holes part way up. I don't think so - since the pyrolysis front drops to the bottom almost immediately. Then the combustion will mostly occur at the bottom. I think it would be almost impossible to make char with this design. 

4. There are sawdust stoves (sometimes called Boy Scout??) that operate similarly (to the central hole design). Dr. Priya Karve did some nice theoretical/experimental work on such. 

5. No one talked about the great efficiency of the Kelly Kettle - because the flame is going up the center. 

6. I wish I had seen how difficult it was to drill the central hole of the Rocket design. Is there a power tool on the market like the chain saw (but for drilling holes)? 


7. This is way off topic - but there was great long video dubbing a 1930 film of logging at: 

http://www.youtube.com/watch?v=cIKCjQdxtO0&feature=related 


Ron 
_____________________ 

From: "Rok Oblak" <rok.stoves at gmail.com> 
To: "Discussion of biomass cooking stoves" <stoves at lists.bioenergylists.org> 
Sent: Saturday, July 16, 2011 12:27:22 PM 
Subject: Re: [Stoves] Fire Stump 

Here are Siberian, Finnish and Swedish and supposedly a Canadian version! No stove needed! 

http://www.youtube.com/watch?v=gMLzY48YwEM&feature=related 
http://www.youtube.com/watch?v=jOAejiwCIpg&feature=related 
http://www.youtube.com/watch?v=wEHSJftQ9Vg&feature=related 
http://www.youtube.com/watch?v=ndcXILxxy_0&feature=related 




On Fri, Jul 15, 2011 at 10:19 PM, Richard Stanley < rstanley at legacyfound.org > wrote: 


Jeff, 

Clever stuff: Someone obviously made three intersecting plunge cuts through the center long axis of the stump, in a 6-sided star pattern. This effectively has turned a fuelwood log into a hollow core briquette ! 

Would like to 
1) compare its burn performance: heat curve emissions time to ignite, time to heat xkgs of water to boiling etc, 
..... as compared to same log, ex these star cuts. 
2) pursue same star pattern molded into an agro residue briquette. 

Richard Stanley 
www.legacyfound.org 
NW Obamaland. 





On Jul 15, 2011, at 7:23 PM, Jeff Davis wrote: 

> Dear List, 
> 
> The odd things one can find when shopping for nuts: 
> 
> < http://www.ecoforestfirewood.com/eco-forest/light-n-go-tm-bonfire-log/ > 
> 
> 
> Truly stumped, 
> 
> 
> Jeff 
> 
> 
> _______________________________________________ 
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> 


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