adiel
Junior Member
Posts: 119
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Post by adiel on Apr 7, 2014 10:44:34 GMT -8
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Post by independentenergy on Apr 7, 2014 10:51:22 GMT -8
adiel The first two videos are not available
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adiel
Junior Member
Posts: 119
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Post by adiel on Apr 7, 2014 11:02:03 GMT -8
maybe now?
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Post by peterberg on Apr 7, 2014 12:48:48 GMT -8
Whoa! Now I see what you have done, this riser is working as a cyclone. I'm sorry for you, this won't work. Tried this before, a cyclone can be a clean burner but it does need a very strong draft. Without that, it won't be reliable at all. My advise: shift the riser to the back and situate the port in the middle of the riser. That way, there will be a double vortex spiralling against each other which will induce a greater gas velocity and longer stay in the riser. Much like the video down here.
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adiel
Junior Member
Posts: 119
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Post by adiel on Apr 7, 2014 13:06:31 GMT -8
peter we have done your standart batch box and got this two spirals like in this video. we are doing this system for some time now. we hoped that it will be posible to make it shorter and with your advice we placed the riser at the side of the box. maybe i didn't understand what do you recomend exactly?
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adiel
Junior Member
Posts: 119
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Post by adiel on Apr 7, 2014 13:33:56 GMT -8
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adiel
Junior Member
Posts: 119
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Post by adiel on Apr 7, 2014 20:08:39 GMT -8
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Post by peterberg on Apr 8, 2014 1:57:02 GMT -8
The first option would be the better one, definitely.
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adiel
Junior Member
Posts: 119
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Post by adiel on Apr 8, 2014 12:22:20 GMT -8
did the change. was good at first. then when i loaded again it smoked so bad i couldn't believe. i had to run away from there wanting to think it's bad wood. hope to try soon with better wood. www.youtube.com/watch?v=N0hLP5pQfHg
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Post by peterberg on Apr 9, 2014 12:32:30 GMT -8
It's quite common to use thicker fuel for a refill, otherwise the stove will produce too much combustible gases and will burst into smoke. The stove will behave differently when coupled to a heat exchanger and a proper chimney. By the way, have you implemented a p-channel yet?
You do need a larger primary air opening when running a bare core, yes. That's because the pull of the chimney stack is missing. Mine does run with air openings together not larger than a quarter system size, and about 1.5 times that starting up when the chimney is cold. My stack temperatures are not exeeding 120 C when the stove is hot.
All in all, this side riser configuration is behaving much the same as the riser at the rear up till now.
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adiel
Junior Member
Posts: 119
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Post by adiel on Apr 13, 2014 10:50:32 GMT -8
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Post by peterberg on Apr 13, 2014 12:17:22 GMT -8
I have yet to look at the SketchUp file but you guys are definitely at the right track. With the stove at full bore, low O2 level and 65 ppm CO is very, very good. It's probably possible to have two even larger pieces in the firebox when it's that hot. Do you know what the flue temperature has been?
I expect the riser slightly shifted to the door in such a way that the space between port and rear wall is not larger than 8 cm would be still alright. Keep that space as small as possible, there will be a certain underpressure in that corner which is working against the flow.
About the 45 degree angle at the bottom: at that spot the gases are changing direction at a 90 degrees corner. When there's a right angle behind, inevitably there will be underpressure. This will slow the fast streaming gases down. To avoid that, it's best to make a smooth round transition from the floor to the back side of the riser. A 45 degree angle is a coarse approximation of that smooth corner. Don't make this overly large, half the diameter of the riser as the height of the rounding is large enough. The bottom rear side of the riser should be looking like a sort of tilted bowl, rounded to left and right as well. All in all, this is a small optimization of not crucial importance, without it the thing will work nevertheless.
Oh, and about the high CO numbers at the end of the run: all the stoves to date will have that, it's because the carbon burning on its own does produce lots of CO. Only when those gases have to go through a flame front, then they are burned. Another way is to close the stove down completely airtight and let the fire die down with a lot of coals to start the next fire, this is done by some Austrian builders I've understand.
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adiel
Junior Member
Posts: 119
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Post by adiel on Apr 13, 2014 13:01:19 GMT -8
and a word about the square flue?
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Post by peterberg on Apr 13, 2014 13:10:34 GMT -8
and a word about the square flue? Oh yes, this is larger than the system size or chimney diameter isn't it? This won't have any adverse effects, it will extract some more heat than a smaller duct, that's all. When you want to make a heated bench shorter, make the channels inside it wider. Because of that the gases will stream slower and give off more heat. A really short bench made of bricks which is entirely hollow will act as a bell, especially when the inlet and outlet are at floor level. A bench like that will be heated up faster because there's less mass to heat up.
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adiel
Junior Member
Posts: 119
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Post by adiel on Apr 13, 2014 13:18:45 GMT -8
yes. yes. come to israel i'll buy you a falafel.
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