Re: homemade forced convection woodgas campstove

[Harmon Seaver <hseaver@cybershamanix.com>]

Keith Addison wrote:

> Fine for camping, not fine for indoors.

     Have you looked at the Reed/Larson IDD stove? I can't see what forced draft
is going to do to make this any cleaner burning. My latest version gets a pretty
nice blue flame. It's essentially smokeless, except for initial startup. A forced
draft isn't going to do anything to improve this -- or am I missing something
here?
     I can see some design work needed for indoor use which would add a chimney to
the outside -- but that would also be true of any forced draft design.

(snip)

>
> For Third World use.
>

    Well, for 3rd World, it's also going to have to be either very simple, so that
it can be easily manufactured by local users on site with cheap, easily obtainable
components. Which would preclude, I'd think, anything with batteries, electric
motors, stirling engines, etc.
      Or it's going to have to be very cheap to make here and ship in vast
quantities to be given away/sold for cost -- and I don't know if that's going to
be possible even with as simple as design as the tin can IDD stove. Or desirable
-- technology transfer is not always a straightforward thing, as I'm sure you
know. "Give a man a fish" vs. "teach him to fish", etc.
       I can see the possibility of improving the IDD stove (the afore mentioned
chimney, for one) which might be might be effective and fairly simple to
implement. My next model will attempt to preheat both primary and secondary air by
putting the Reed/Larson IDD stove into another slightly larger can so the air has
to come down from the top, along the outside of the IDD stove to reach the primary
draft opening in the bottom, and, of course, the secondary air inlets above the
fuel bed.
       And maybe this "outside" can would also facilitate the adding of a chimney.
Think of setting the whole IDD stove inside a 10L drum (if such a think exists,
I'm thinking of the cooking oil containers sent by aid agencies) -- but OTOH,
perhaps this also is becoming much too complicated. How are you going to get 3rd
Worlders to adopt chimneys when they have no stove pipe?



--
Harmon Seaver
CyberShamanix
http://www.cybershamanix.com



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