[Stoves] High Efficiency fans.

[Paul S. Anderson]

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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