Sunday, 22 March 2009

Wood Gass Stove

This is a small wood gas stove, it pyrolysis the fuel (wood chips) giving heat and leaving charcoal. it holds about 200g chips, boils 1lt water in 7 minutes and burns for about 20 minutes, leaving charcoal for the composting process.
I'm Learning about the carbon cycle and how much energy this culture wastes.
Charcoal added to humanur composting may fix a large amount of carbon into active earth nutrients, might be the secret of Tera preta.
more stoves to follow.


Anonymous said...

I love the woodgas stoves - a great way to cook using just little scraps of wood and twigs etc. But using electricity to power a fan bothers me and it takes away from the environmental friendliness of the stove. For this reason I prefer the fanless woodgas stoves like the Bushwhacker and Bushbuddy designs (although there's no way I'd pay $100 for a Bushbuddy when it can be made for nothing!).

Actually, thinking about it....for fan powered stoves how about a wind-up mechanism to spin a fan? A few seconds of winding would be plenty for several minutes of fan operation if done properly....I've just given myself an idea!

Sussex, UK

Ausearth said...

Hi Pete.
Ignorance is grand.
The operating parameters of these small stoves is very tight.
This type of small stove dose not have a chimney to create draft.
A salvaged compute fan can be found on the trash.
Batteries can be solar charged.
I was reading a detail on the stoves list, the ratio of power consumed by fan and output of stove is vast.
(sorry cant find the data).
A fan speed control allows one to find the stove sweet spot and also control temp.
Experimentation is also grand, it moves ignorance to knowledge.
When you produce a wind up device let me know.
I have a collection of sites dealing with stoves here.

Hope this helps.

Anonymous said...

I get what you're saying. I read somewhere that an electric PC fan consuming 3W enables the woodgas stove to produce several kW of heat, so yep, the ratio of input power to output power is vast.

However.....when I think about batteries, I think about all the badness that goes into their production - the contamination of the land around nickel mine and smelting plants, the contamination from the battery production process and all that. Then when I think about solar panels, I think about all the energy and water that goes into the extraction of silicon, and all the energy and materials going into the production of the solar panels, and the length of time it takes for this to be paid back by the energy produced by the panel. That said, I do have a 20W 12V rollable solar panel that I use for battery charging, and enjoy making the most of this to charge batteries for my ham radio equipment and various other items. But....I'm warming to the idea of using the wind up mechanism from an old clock or kid's toy to use to power a simple fan ;)

Great blog, by the way. I'm enjoying reading what you have here. I'm also an earthlover and doing my best to pass this on to my kids!

Sussex, UK

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