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Post by miquel on Jan 7, 2017 14:51:20 GMT -8
The bottom of the rocket stove is isolated with perlite.
The bigger gap is in the flue transition side. I would say is 3'' more or less. But anyway is to small. According Peter's calculations mentioned in the thread (http://donkey32.proboards.com/thread/337/helpful-hint). If I understand the flue transition need to be, almost, doble of chimney cross section area. Am I right? If I have 3'' by 10'' on the bottom aprox, this make 30 square inch. I need 60 square inch more for transition flue. I want to achive this by making a hole 6'' by 10'' in the side of barrel. That's a combination of first and the third option Peter says on the previous thread. Please someone confirm this . Not sure how many days was the bench drying, but I think arround one month. Right now is dry.
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Post by satamax on Jan 7, 2017 15:37:26 GMT -8
Miquel, yep, 60 square inches would be good. This, for example, is a good flue transition. EDven tho it's too close to the heat riser. permies.com/t/29781/a/12692/2013-11-18%2015.07.50.jpgThis is a good option too permies.com/t/35461/a/16611/thumb-DSCF2057.JPGpermies.com/t/42592/a/24046/thumb-100_0857.JPGpermies.com/t/19519/a/7428/thumb-rocket%20stove%20final%20004.JPGCutting your barrel, and building a dome on the side, with chicken wire and cob could do the trick. Heat riser's top permies.com/t/33407/a/15151/thumb-R-8.JPGAnd your bench, after one month, i you haven't burned much, is not dry. It can take a good three months. To test your rocket, can you link with some pipe, or some cobbed bricks, the two flue cleanouts you have, just after the barrel, and before the chimney. This would help isolate the problems. If the burn unit works better without the flue pipes in the system, just the shortcut i'm advising, you would need to shorten the pipes in your bench. May be you could do a bypass, to use the rest of the bench later in the burn.
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Post by miquel on Jan 8, 2017 11:46:05 GMT -8
I just finish the dome for a better flue transition. It seems the draw is better And modify the upper heat riser to a trumpet bell shape. I upload some images and one video if you want to take a look (https://goo.gl/photos/AZ4iWzNDyUhde4647) But the burn isn't clean, smoke still visible. I think the bench is dry, two months RMH working 10 hours every day. I was thinking about lifting the wooden desk on the bench with 1'' spikes to allow the heat can escape.. What do you think?
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Post by drooster on Jan 8, 2017 13:52:03 GMT -8
These extra photos just emphasise my earlier comment : I still do not see how there is enough space down the outside of the riser inside the outer barrel ... but nobody else has even mentioned it. What's going on?
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Post by wiscojames on Jan 8, 2017 15:53:45 GMT -8
I agree. Looks like insufficient gap between riser and radiator barrel.
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Post by miquel on Jan 9, 2017 0:32:04 GMT -8
Yes, you're right. I didn't remember. The gap at the sides not 2'' is a little less. I think that is 1.5'' (Ianto Evans book), I wanted to make it as small as possible to isolate as much as possible. Did you see the video? Seems a good draw to you?
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Post by miquel on Jan 9, 2017 9:41:20 GMT -8
After all day with the stove burning, I can say that burns better. Smoke is invisible or just visible a little bit. Do you think it's worth someday change the simple tubes of the chimney to dobles isolated? Or the improvement will be imperceptible? Any suggestion to do better? Wolf1004 could you post some photos of your clenouts isolation? Is there another way to solve the problem of condensation?
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Post by Dan (Upstate NY, USA) on Jan 10, 2017 9:02:25 GMT -8
Its hard to see but the insides are filled with rock wool. A bolt with a piece of sheet metal keeps it altogether...
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Post by miquel on Jan 24, 2017 12:40:30 GMT -8
Hello, I'm thinking, when the winter has passed, to change the rocket-barrel for a batch box bell, single or double. And once the bell is hot enough, to close the bell's output and passing the smoke to the existing bench. Do you think it can work? Any comments?
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Post by miquel on Oct 23, 2017 13:26:55 GMT -8
Hello, I want to transform the previous 20 cm rocket-barrel bench to batch single bell with bench. The bench has five 90º elbows, four horizontal and the fifth is vertical for the chimney, and is 9 meters long. The bell has an ISA more or less 7 m2 and one 40x30x30 cm oven.. A bell with a single skin with normal bricks. Batch box with 3 cm refractory brick thick without insulation. Heat riser isolated, ground and back of the bell isolated .. I want to make a trapdoor to select direct chimney exit and closed bench and once bell's hot enought, close direct exit chimney and to pass trought the bench. The inside bell real volume is small I don't know if more volume or more gaps between walls is nedeed for system proper working. Any advise? Could it work? Attached sketch.
Thanks in advance,
Miquel
P.D: I can't attach sketch "Error: This forum has exceeded its attachment space limit. Your file cannot be uploaded. "
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Post by wiscojames on Oct 23, 2017 14:48:01 GMT -8
You need to host your documents and photos at another site.
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Post by miquel on Oct 24, 2017 7:55:35 GMT -8
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Post by Orange on Oct 26, 2017 12:53:15 GMT -8
I guess you need some bricks to direct exhaust so it fills bench before exit like this:
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Post by miquel on Oct 27, 2017 22:11:14 GMT -8
Sorry, I did not explain myself well. The bench is already part of an RMH. In other words, it already has a 20 cm tube that runs its entire length. As you have drawn but with stainless tube. My question is whether the gaps inside the bell are sufficient for it to properly run airflow inside the bell and it will warm homogenously bell and oven, and then once hot it will be able to go over the bench.
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