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Post by salamandre on Oct 23, 2018 12:56:53 GMT -8
Hi , thanks a lot for the helps. I changed the exhaust under the barrel : wide is now 30 cm and heigh 19 cm, so the area is 570 cm 2 (with the area of the riser is 176 cm 2, so the goal is at least 352 cm 2 ). www.dropbox.com/sh/nxdp3wnbr2fd3te/AAAHbxcRHZ3Ryqg29eXWJxbla?dl=0Peterberg, i read the old posts, very interesting even if i don't undersant all the maths, above all the distance between the insulation of the riser and barrel. In my case, it seems a lot. It doesn't matter, i think the exhaust is enough large. I need now to make the smooth connection as shown by Drooster : a toboggan under the barrel and a funnel after the exhaust. thanks again
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Post by satamax on Oct 23, 2018 13:24:15 GMT -8
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Post by peterberg on Oct 24, 2018 0:04:33 GMT -8
I need now to make the smooth connection as shown by Drooster : a toboggan under the barrel and a funnel after the exhaust. The funnel downstream from that large opening to the horizontal pipe in the bench, yes. The toboggan slope under the barrel to the exit opening looks nice, but isn't really necessary. Your opening is now wide enough to avoid restriction. The point is that the wider space need to be where the gases streaming through that 90º bend. In your layout that's catered for already. Another detail: between that opening you have there and the bench pipe there should be a wider space still, often called the manifold. Function of this is to trap the flyash early in the bench system. There should be an ashdoor of some kind to be able to rake out the ash, of course.
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Post by salamandre on Oct 26, 2018 12:44:03 GMT -8
After a few daysto think, build and rebuild (thanks the work with clay ), i found, i hope a right configuration. www.dropbox.com/sh/nxdp3wnbr2fd3te/AAAHbxcRHZ3Ryqg29eXWJxbla?dl=0I think the manifold is not perfect, a little too small, but if i have done longer, my bench would have become really too small, I think to store the heat. Now, after the ash door in steel, there is 1,60m until the wall (so the pipe is shorter with a U-turn). To be sure the pictures are clear, i front of the metal ashdoor, is a door for the by pass and to clean after having swept the pipe.
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Post by salamandre on Oct 28, 2018 4:03:13 GMT -8
Hi,
i made the first fire inside, a small of course. The start was easy enough, just a little leak at the bypass because pipe will go in the bench became a little bit lukwarm.
Thanks for the help, and i will post new pictures to follow the finishing.
good day
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Post by salamandre on Oct 30, 2018 14:06:19 GMT -8
After a few days of burning, i don't find the temperature of the barrel and the chimney became very hot. For the chimney is maximum 50°C, even with the closed bypass. The fire is powered a half-day. I am well aware, lot things are wet and need to dry. I will have thought, since the riser and the box are dry (except may be the "toboggan" around the riser), the fire will be stronger and so the barrel hoter. The box is not yet insulated, is it an explanation ? Do you think i need to change somethings or just wait ? Make a bigger fire ? The door (now it is just bricks, so there is not a leak of oxygène) ? Thanks in advance
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Post by satamax on Oct 30, 2018 22:52:35 GMT -8
Barrel should be in the 250/300C° range. on top.
Are your pipes covered by cob now? 80C° after a half day of burning, is very low, with bare pipes, this is normal, as metal sheds lots of heat. With covered pipes, i don't know. I have never used pipes with a batch.
But if all is cobbed, you can count between three weeks and 3 months of drying time.
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Post by salamandre on Oct 30, 2018 23:54:27 GMT -8
Right now, the temperature on the side of the barrel, 5 cm under the top, is 200°C and almost 250°C on the top. There is 35 cm between the riser and the top of the barrel. All the pipes are cobbed now (cob and stones). On the other hand, the barrel is bare (except the bottom 10 cm of course), may be the heat is dispersed by the bare barrel ? and may be the non insulated box ?
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Post by satamax on Oct 31, 2018 2:11:32 GMT -8
Doesn't seem too bad temperature wise.
Did you do a full fire?
What wood did you use?
I think it's just that it needs time to dry.
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Post by etownandrew on Oct 31, 2018 8:13:01 GMT -8
I didn't see a picture where you wrapped the riser with an insulating blanket. Does it have any insulation?
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Post by salamandre on Oct 31, 2018 14:30:09 GMT -8
To Satamax : i use chestnut and oak and i don't do a full fire. To Etownandrew : i used insulated refrecatory bricks, it seems it is enough.
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Post by salamandre on Dec 4, 2018 13:59:19 GMT -8
Hi, the rocket is almost finished,it remains the finishes, as you can see: www.dropbox.com/sh/nxdp3wnbr2fd3te/AAAHbxcRHZ3Ryqg29eXWJxbla?dl=0after more than one month of heating with the rocket,I have still some questions/issues. The most important is the bench stay cold or a little lukewarm after long fire (3 or 4 box following). Except the two stones which are in direct contact with the pipe. The chimney temperature is around 50°C, regardless of the position of the bypass. It is like all the heat was diffused by the barrel and the manifold / ashpit (the stones which are just after the barrel are really hot, but since the pipe start it is cool). That's why I covered the barrel by cob, not very thick. But no big changes : the heat is "softer" during the fire, the temp is 60°C. Except that, i am happy of the rocket, it is the only way to heat the house, it is work, but the weather is not too cold, it is rainy in this time. The fire start easily, the top of barrel reach 270°C (except the last days but i supecte the humidity of the wood because some water reappared in the pipe whereas it was at least 2 weeks there are no water). If you are any ideas or explanations ... May be it is necessary to put more cob, or remove the barrel and make "a bell" in adobes, or anything. Thanks
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Post by wiscojames on Dec 4, 2018 17:45:24 GMT -8
I vote for a bell to replace the hvac ducts. And if you don't need fast heat, remove the barrel altogether.
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