[Stoves] Magh Utham Woodgas Burner

[Ronald Hongsermeier]

Greetings Crispin,

comments interlinear

> -----Ursprüngliche Nachricht-----
> Von: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
> Gesendet: 07.01.09 16:14:36
> An: "'Discussion of biomass cooking stoves'" <stoves at listserv.repp.org>
> Betreff: Re: [Stoves] Magh Utham Woodgas Burner


> Dear Ron
> 
> The stove from the FADA/UJ student was made from a 20 litre tin. The
> interesting part was the use of tin snips to make a vortex with slightly
> preheated air, a cone and therefore a stove without any fasteners or
> welding. Pretty neat.
> 

That's pretty big. It looks like the feet/primary air inlet is a double cut perpendicular to the bottom rim and folded inwards. one could place a screen on top of that to keep the inlets from filling with char.

There appear to be pop-rivets in the picture-- or am I hallucinating again?

> Feeding fuel into a stove is ok and even necessary in some applications, but
> for many things it is not. For example, millions of ordinary BBQs (braai)
> are top loaders and it is managed by the cook choosing how much fuel to put
> in early on. Objections to top loaders are usually overblown. It depends on
> the fuel available more than anything. Hardwood will burn for 1-2 hours

I don't have any trouble with top- and or batch-loading in general, just the picture was for my gut reaction pretty over the top with excess fuel. Seemed as would have been hard to get a good heating interface with a pot.

> without adding fuel which is a pleasure to cook with.
> 
> What was common to the FADA student projects is that for the most part they
> were combustors, not stoves. That was interesting because they are supposed
> to be product designers.
> 
> There was a great deal of enthusiasm for the project and they went to
> Mozambique to try to design a stove on the ground with local fabricators.
> Much to everyone's surprise, the local stoves where they went were all made
> from 4mm steel sheet. ??? they all asked!
> 
> Turns out there is a large local supply of old pressed-steel railway ties,
> all 4mm thick. So the stoves last ages and cost nothing much. The designs
> are dreadful, but it was not the material they have been designing for. Good
> lesson!
> 

If it's there, it's there to use, if it's cheap...

> Regards
> Crispin
> 
> 
> -----Original Message-----
> 
> Dear Crispin,
> 
> thanks for the pic!
> 
> One observation and one suggestion:
> 
> I can't tell by the size of any referents in the picture how big the can is.
> 
> By putting an extra "half-round" in the slit on one or several of the slits,
> it would be possible to add fuel through the sides and thus bring the
> cooking vessel into constant distance from the top of the exhaust.
> 
> regards,
> 
> Ron H
> 
> 
> _______________________________________________
> Stoves mailing list
> Stoves at listserv.repp.org
> http://listserv.repp.org/mailman/listinfo/stoves_listserv.repp.org
> http://stoves.bioenergylists.org
> http://info.bioenergylists.org
>