Kristijan, maybe these were used for summertime cooking in your neck of the woods as well?
You just remove a plate on your stove an put this one on top. It contains a much smaller fire, doesn’t give off much heat to the surroundings and utilizes the flue of your stove below.
Up here it’s called a sparspis. Direct translation is “saving stove”. To me it seems you would be able to skip quite a few steps of complexity by just heating with a few sticks.
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This looks VERY interesting. Google and YouTube can’t help me on this one. It looks like combustion air enters at the front bottom, firebox door above it?. Hot gas goes up to the rings, and then back down to the bottom and into the woodstove?
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That’s right.
Here’s another pic - rings removed and looking down at the grate.
These were quite common back in the days, but I couldn’t find a single youtube either.
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Very interesting, almost like a rocket stove if you think about it, but it uses the wood stove as a way to remove the smoke.
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It is really popular in China as well. They ran out of firewood in the late 70s so the government started pushing methane digesters. Apparently now the government pays half the cost but it requires the kitchen, toilet, livestock pen all to funneled to it. They basically build a brick lined pit in the ground.
All and all the main issue is the low quality/low volume gas is produced and it is acidic so it erodes things. It is basically a lagoon system but you are capturing the methane from it.
It really isn’t different then the ‘fermentation’ barrels people are using to make organic fertilizer except they are capturing the gas off it.
It works, but you do need quite a bit of volume for the gas, and to me, it’s main benefit is more the fertilizer.
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i thought also about biogas production …in a colder climate it should built in a space on the south wall of the house, the digester behind glass windows like as beeing in a greenhouse, so heats from the sun, and should also have a channel for warm air or a heat exchanger from the always burning house stove in the cold time…but this things can be planned best in building a new house…in a old house like ours often the circumstances as room positions, chimney and so on are not in the best position for this…
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if you can dig it into the ground under the frost line, it would work. It is basically a septic tank but sealed to prevent air from escaping. In modern houses, we all have the bathroom stand pipes coming out the roof to vent off the gas. but then comes the issue of how to get the ‘fertilizer’ out of it. If you fall in, it is all CO2 and you die because of no oxygen to breathe.
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andre, for cooking indoor is the danger of poisoning , if the flame goes off and unburned gas goes in the room…but there can be found intelligent solutions…
how kristijan like to make…as a adaption in the kitchen stove, for summertime use, WHEN the chimney has a good draft, so in case the flame goes off, the poisonous gas goes away through the chimney instead in the room…but sometimes chimneys in summer has no draft…is to control also this…
my concept would be, because i have a bad chimney draft, to have the gas cooker in a box, think as glass box like a aquarium, with a airthight door, and a air channel at the bottom, where the air needed for combustion, enters in the box…further somewhere higher, another air channel where cooking vapours can escape out of the box, always going through the house wall to outside…so, if using, open the airthigt door, light the gas, handle with the pans and so on, …since you are there, you have always control if the flame burns, when you must go away and let cook something, close the airthight door, so in case the flame goes off by some reason, the poison gas goes away through the upper channel…this my theoretical thought. there but is needed a relieable gas producer, that not goes of by bridging or hollow burns…mine runs for 4 hours without interruption since the caol is finished…this was a longer try and error developement…
when the cooker glas boxes upper channel, that brings vapours away, has a draft, (built by longer pipe,) , better again…
but always careful with woodgas inside!!!, and relieable persons what handle it!!
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Look up how many people have died in grain silos and manure pits from asphyxiation or silo explosions. I was looking for video from the RealMartian about his large and elaborate methane producer which never worked very well but couldn’t look through a hundred youtubes to find it. I did get this.
https://www.youtube.com/results?search_query=Methane+production
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Giorgio, this would be the most important thing to consider. this gives me to think more about the security issues.
Now i have sufficient information from you guys to actually build this oven in one or another layout…
Thanks again for all your help guys!
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