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Post by satamax on Jan 2, 2015 4:02:36 GMT -8
I doubt they've seen much of thoses in real life in Romania! There might be ten of thoses in france! If even that! They might have some Melkus! en.wikipedia.org/wiki/MelkusBut if you want orange, i'm affraid this is your only choice!
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nemo
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Post by nemo on Jan 3, 2015 0:53:19 GMT -8
I will try the version with the steel plate and water , could work. I rearely have smokeback because the tower is of almost 2 barrels high and got pretty good draft, but not as good as not to burn the wood up high and have lots of coal.Will not the second air gap,inlet, affect the gaseification process? I mean burning all gasses ? We do not have musle cars in Romania, or Europe, that is a privilege belonging to the big gas producers but I did drive a friends car for few dayshttp://sco.m.wikipedia.org/wiki/Ford_Taunus#/image/File:Ford_Taunus_GXL_Coupe_1974.jpg
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nemo
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Post by nemo on Jan 3, 2015 2:05:48 GMT -8
The only orange I see lately is the one in front of my house and underneath my feet
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nemo
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Post by nemo on Jan 3, 2015 2:11:05 GMT -8
Also,I do like orange, but on a barrel like that, it would scream: attention, toxic!
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nemo
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Post by nemo on Feb 1, 2015 9:53:28 GMT -8
Hy guys! I came back with the almost finished stove I have built with half barrels. It is the first stove from many to come. The barrel, the first bell suffered some modifications along the way, also the feed.
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nemo
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Post by nemo on Feb 1, 2015 9:54:12 GMT -8
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nemo
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Post by nemo on Feb 1, 2015 9:55:30 GMT -8
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nemo
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Post by nemo on Feb 1, 2015 9:56:39 GMT -8
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nemo
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Post by nemo on Feb 1, 2015 9:57:37 GMT -8
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nemo
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Post by nemo on Feb 1, 2015 9:58:29 GMT -8
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nemo
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Post by nemo on Feb 3, 2015 5:06:06 GMT -8
My impressions after some burn weeks and experiments with this rocket are these. Rocket stoves domain is still experimental. The stove is not 100% as efficient as the book said but it is a significant difference between it an a normal stove. Burning wood for a day and heating a room for 3 days due to thermal mass is for me a myth. There should be a calculation done to see how much space you can heat and for how much time with a 6' system and a 8'. Of course this is hard to do because there are so many factors: material types used in thermal mass, thickness, type of fuel, how good the room is sealed , how tall it is, etc. I have used one barrel at first and outside were -15C, inside around 15-17. The thermal mass was good for heating but and only on the higher arch of the half barrels, the sides stayed either room temperature or colder. I have there 4 half barrels and the first two barrels(with cob) got heated somewhere between 30C to 40C(also 50C on small portions of the first barrel closest to the first bell). So heating the room with the thermal mass even shortly after the fire dies out is out of the question. The mass gets cold in one to two hours after the fire dies. So I have raised the heat riser with 3/4 of a barrel and insulated the feed the best I could. I have put some cob on the first barrel and left the second open. Temperatures raised in the room but for only as long as the fire burns. Also after some 10 to 15 hours of continuous burn the temperature in the riser tend to equalise and the draft is very poor. In many cases the fire completely died out. If the wood is dry and small, temperature in the room raises fast, otherwise, the thermal mass, or half of it, is just a warm bed. I also used normal brick stoves and when there I talk about thermal mass, that really gets hot and last many hours after the fire dies, also you can load lots of wood in there and in many cases I fully load it before I go to sleep and still find fire in the morning. In conclusion, the advantages of a rocket stove start to fade in comparison to a masonry heater. I really liked the concept and yet do not want to give up on such wonderful stoves. One thing that remains is the efficient wood burn, less gasses .
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Post by Dan (Upstate NY, USA) on Feb 3, 2015 7:27:47 GMT -8
I don't agree. I think of my rocket stove as a masonry heater, 8"/20cm system with 30'/9.15m going through 2ton/1800kg of concrete. And then 25'/7.62 meters of external insulated metal chimney 6"/15.24cm.
I light a fire before I go to bed and wake up to a warm house with a bench that would stay warm until the following night even if the air temperature in the house would drop.
10 to 15 hours of continuous burn would burn people on my concrete bench!
The longest continuous burn I could do is maybe 1 hour or 1.5 hours, then it would be hot enough to boil water on my bench. 250F/120C
1) How tall is your building? 2) Do you have an chimney that goes above the roofline of your building? 3) With a 10 to 15 hour burn is the top of your barrel glowing orange?
When you talk about the draft stalling it makes me think there is a design problem with your exhaust chimney, flex duct does slow down velocity a lot.
I don't know, something seems wrong.
I just lit another fire because my kid is sick on the couch, we have been keeping the house at 80F/27C because of it. We really didn't need it but the bench is above 140F/60C (I can't leave my hand on it) and its been a couple hours since we burnt a fire. We usually don't run it this way.
Its -10C/13F outside now, the colder it is outside the more draft I have the hotter this thing burns.
I look forward to your reply, maybe we can make that monster perform like it should!
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nemo
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Post by nemo on Feb 4, 2015 17:04:51 GMT -8
Wow, wolf, what you describe sounds nice and encouraging. Maybe there is a problem somewhere. The top of my barrel does not glow, but any water I put there "runs" away fast and evaporates. The chimney is above roof line. The building is just a house with one floor. Not that tall,5m, not that insulated either. Thank you for reply!
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Post by Dan (Upstate NY, USA) on Feb 5, 2015 7:57:11 GMT -8
How much space do you have in the top of your barrel between the heat riser and the top of the drum? Could your insulation have expanded and blocked off some flow?
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nemo
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Post by nemo on Feb 5, 2015 11:08:18 GMT -8
Top space is 7cm and sides are between 3 to 5cm. Insulation is formed of clay mixed with sawdust and glass wool covered with metal. My thoughts are these. At the exit flue after first bell , what are the average temperatures? I remember something between50to70C? If the there are more barrels on top of eachother, the heat is fast radiated in the room and if room is not insulated, it is lost through the ceiling. It remains less heat to go through the thermal mass. So overall, a big space could be the reason for this? Maybe there is more to it but none of the experiments I made with this stove got more than 70degrees C out of the barrel for the flue to be heated. Mwithout barrel(bell), yes, even 400 or more...I do not have instruments for measurement just estimating.
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