[Stoves] High Efficiency fans.

[dstill at epud.net]

Dear Kyle and Paul,

Fan stoves are really worth the effort! Extremely clean in tests at Aprovecho
and Colorado State University! Making sure that the fan doesn't get too hot is
the trick, I think. And it seems like a good idea to have the fan and motor
where it can be replaced. 

Hopefully the CSU data will be finished by ETHOS and we can all discuss how to
make wood burning stoves that drastically reduce climate change emissions. Seems
to me that there are four issues addressed by stoves: making the cook's life
easier, deforestation, indoor air pollution, climate change. Many situations
means many solutions but to be effective the stoves need to reduce fuel use, get
the smoke out of the kitchen and burn clean.

Fan stoves top the list for clean. But so far they are batch fed which is
inconvenient and impractical. A sidefeed fan stove that can burn the usual fuel
would be a great help, I think. Maybe Paul and others can bring prototypes to ETHOS?

Best,

Dean

Quoting "Paul S. Anderson" <psanders at ilstu.edu>:

> Kyle, and all,
> 
> Please encourage your engineer friend to continue.  Sorry that I do not
> 
> have the
> technical knowledge to tell you how much air power is needed.  But I can
> say
> that there will be uses for almost any sizes that can be made.
> 
> Here in Cambodia (this month), I am working with a Vietnamese blower 
> (not a fan)
> that takes 220 volt AC from the wall socket, transforms into 12 vol DC,
> has 5
> speeds of the motor, plus the squirrel cage blades and housing, and a
> delivery
> nozzle.   And all for the price of US$2.   Yes, two dollars.  I will 
> bring some
> back to the USA and show it at ETHOS.  Its air power could be a little
> higher
> for some of my larger applications, but I can solve that with other
> blowers.
> 
> Paul
> 
> -- 
> Paul S. Anderson, Ph.D., Geography professor - Emeritus
> Telephone:  USA-309-452-7072 (residence and office)
> Internet site:  www.ilstu.edu/~psanders
> For my gasifier stoves info, go to:
> http://bioenergylists.org/contributors#Paul_Anderson
> 
> 
> Quoting Kyle Thompson <mailthompson at yahoo.com>:
> 
> > It is not necessary to "block" the air intake of a fan assembly to 
> > reduce the amount of air put into the stove.  This is hard on the 
> > fan, puts drag on the motor and probably a few other bad things 
> > happen (bad nosie?)
> >
> > Just simply bleed off the excess air.  This will keep the fan running
> 
> > near its optimized design efficiency.  Both the motor and blade of 
> > the fan can be optimized for the use.
> >
> > I've talked to an engineer that is involved in the design of high 
> > efficiency, light weight, cheap fan/motor assemblys.
> >
> > If someone (Paul Anderson or Tom) would like to tell me the Maximum 
> > amount of air throughput, fan life ect. I should be able to work with
> 
> > this engineer to get some prototypes for testing.
> >
> > I have talked to this engineer about the stove project and he was 
> > very interested in the humanitarian implications.
> >
> > I have pulled 1.5 volt motors and placed a 12 volt 3.5 inch blade on
> 
> > them from a PC power supply.  I fill the center with glue an drill a
> 
> > hole in it for the motor spindrel.  I guess it would be easier to 
> > just place a cork in there instead of glue.
> >
> > I'll have to test the assembly for runtime on 1 D battery, but I get
> 
> > enough power from 1 D cell for cooking 2 meals a day for a week, with
> 
> > plenty of power left over.
> >
> > When you consider the simplicity of the design, there isn't a whole 
> > lot that can go bad, and the air output is potentially infinitally 
> > variable from 0 to maximum output of the fan.
> >
> > The woodgas stove puts the fan in the stove, which is fine.  My 
> > designs tend to melt the fans when I place them too close to the 
> > stove, so I like to keep the fan seperate.  I can easily replace the
> 
> > burn chambers then.  In addition I like to take the fan out and use 
> > it to "cheat" to get a campfire really going easy... without
> kerosene.
> >
> >
> >
> >
>
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> 
> 
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