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Post by peterberg on Dec 25, 2014 14:00:19 GMT -8
Thank you very much! I really appreciate it!! how do you calculated 7.69? The chimney is new of course square meter what abaut a singel wall chimney and put it into the wall with an air gap? It's a calculation based on the riser's cross section area, as all the rest of the batch box scaling is. The accepted ISA for a 6" or 15cm system is 6m2. The CSA of the riser is 177cm2. A riser of 17cm dia is 227cm2. That is 1.28 times larger than 177cm2. The ISA of a single masonry bell could therefore be 1.28 x 6m2 = 7.69m2. The above doesn't seem right, but when you calculate up to 5 decimals it is. No insulation around the pipe will mean it's shedding heat, period. When you take that into account and deduct it somewhere else it's alright. On the other hand I think it isn't a good thing to have a hot chimney pipe on top of a bench, by the way so I would use an insulated pipe.
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Post by shilo on Dec 25, 2014 14:31:28 GMT -8
I meant to insert the chimney inside the wall in order it will be imposible to show or touch it. This is wall of blocks with air around the chimney. it's possible to be satisfied with a singel wall chimney?
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Post by shilo on Dec 25, 2014 22:27:31 GMT -8
won't the great vertical distance between the bells, Cause mixing at the uper bell?
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Post by shilo on Dec 27, 2014 12:02:28 GMT -8
?
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Post by DCish on Dec 27, 2014 21:20:18 GMT -8
won't the great vertical distance between the bells, Cause mixing at the uper bell? Not quite sure I understand the question. Is your concern that the long rise will create high velocity flow as gasses enter the upper bell? Velocity should be stable throughout the system, any velocity increase from vertical rise would be imparted to the system as a whole.
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Post by peterberg on Dec 28, 2014 1:23:46 GMT -8
I meant to insert the chimney inside the wall in order it will be imposible to show or touch it. This is wall of blocks with air around the chimney. it's possible to be satisfied with a singel wall chimney? That wall of blocks will get warm unless you stuff insulation material around it. This way, there will be more heat for the second floor. I'll second DCish about the velocity in that vertical piece.
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Post by shilo on Dec 29, 2014 1:20:37 GMT -8
This sounds logical thank you
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geri
New Member
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Post by geri on Dec 30, 2014 14:29:04 GMT -8
Hello everyone, I'm new to this forum and am planning on building a rocket stove in my "earthship" style home. Can someone tell me how hot the chimney is as it exits the roof?
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Post by Donkey on Dec 30, 2014 16:32:05 GMT -8
Hello everyone, I'm new to this forum and am planning on building a rocket stove in my "earthship" style home. Can someone tell me how hot the chimney is as it exits the roof? That depends on how you build it.. The answer can vary from almost a thousand degrees to roughly body temperature depending on how you deal with the produced heat. These are DIY stoves and results WILL vary. Welcome to the boards.
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gjh42
Junior Member
Posts: 61
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Post by gjh42 on Dec 30, 2014 17:10:15 GMT -8
As Donkey says, your results will vary depending on your construction, but many describe being able to touch the stovepipe as it leaves the house, whether easily or only for a moment. If you have much higher exit temperatures, you are probably wasting heat unnecessarily, and should adjust your system to absorb more heat if you can.
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geri
New Member
Posts: 8
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Post by geri on Dec 31, 2014 11:18:54 GMT -8
Thank you both for your help. i am planning on building a bench and also using cob around the pipe all the way to the ceiling.
i also was curious about building two units and using the same exhaust pipe? the one unit would be as an island and used as a cooking stove with the exhaust pipe going through the dirt floor and up to meet the unit against the wall used for heat. Can i use the same exhaust pipe going through the roof?
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Post by patamos on Dec 31, 2014 12:27:55 GMT -8
You would need to make sure the CSA of the downstream pipe is large enough to accommodate the maximal volume of both smaller flues. You would need a little bigger than 8" pipe to handle two 6" pipes. That said, the system would probably not pull as well with only one fire chamber running. I have heard mixed results. Perhaps the more experienced builders can shed some light
Regarding cobbing the flue pipe up to the ceiling. You might want to go about doing that gradually, or only up the back half at first, until you know how much heat you are sending through it. If the pipe is too cold then you can add more cob around its exposed surface areas to decrease its radiation.
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Post by shilo on Dec 31, 2014 12:50:06 GMT -8
Thank you both for your help. i am planning on building a bench and also using cob around the pipe all the way to the ceiling. i also was curious about building two units and using the same exhaust pipe? the one unit would be as an island and used as a cooking stove with the exhaust pipe going through the dirt floor and up to meet the unit against the wall used for heat. Can i use the same exhaust pipe going through the roof? that is problems asking
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geri
New Member
Posts: 8
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Post by geri on Dec 31, 2014 15:28:04 GMT -8
ok. thank you. i appreciate your help. i will look at plan B. Have a great evening.
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geri
New Member
Posts: 8
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Post by geri on Jan 1, 2015 12:15:30 GMT -8
Happy New Year! now i have another question. How thick does the cob need to be so that whatever is behind it doesn't burn? Thank you.
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