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Post by manuel on Nov 28, 2015 2:38:24 GMT -8
Hello all. It's been a long time since my last post (and RMH) but here I am again hands on bricks, mud and iron. This time we're building a 6" RMH in wich we want to have a white oven. I thought on a design like this and we'd apreciatte very much your help. Here is a not yet finished sketch up (oven measurements not properly done and I have to draw T's and elbows too), not much time for computer Sketchup- sketch up So here come my quiestions: 1 Do you think it would be better to have the barrel gas out up over the oven or would it work as on the drawing, on the oven bottom? (we should cut the flue, same height, coming in from the left, going out at right) (I do think it would be better as gas would be much hotter, less radiant loss on barrel, and more direct gas heat on oven upper side) 2 How wide do you consider we should let the gap between the inner white oven and the bell's bricks? 3 Do you think it would work or are we triyng too much? Well, that's enough for now, I must go cutting flues and so on... Have a nice day and thank you in advance: Manuel
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Post by satamax on Nov 28, 2015 3:58:00 GMT -8
I would put the oven directly over the heat riser.
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Post by manuel on Nov 28, 2015 4:33:35 GMT -8
Hello Satamax!
Don't you think it would be too much hot?
So Do you think what we are doing would't work?
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Post by josephcrawley on Nov 28, 2015 6:25:49 GMT -8
Mine is over the riser and it gets to 450 after a second load of wood. It is all masonry so it has a fair amount of mass. Shortening the riser as suggested by silo makes it much more doable without making a mammoth tower.
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Post by satamax on Nov 28, 2015 6:26:32 GMT -8
Well, a white oven is an accumulation oven. You need the heat to travel first to the inside of the oven to cook food. And if you want to cook at high heat some roasts. I think you would loose too much heat before it reaches the oven, if you put it away from the heat source. Do you know what is the usual heat of the bench? Less than a hundred degrees farenheit. That's not much for cooking.
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Post by manuel on Nov 29, 2015 9:44:52 GMT -8
Well, a white oven is an accumulation oven. You need the heat to travel first to the inside of the oven to cook food. And if you want to cook at high heat some roasts. I think you would loose too much heat before it reaches the oven, if you put it away from the heat source. Do you know what is the usual heat of the bench? Less than a hundred degrees farenheit. That's not much for cooking. >>a white oven is an accumulation oven. Oppsss, What we do want is an oven which is a box inside the bell and doesn't let the gas go trought it. So we want the gas temperature to cook the food, not the brick's radiant heat. I thought it was called "white oven", my translation fault. On the previous RMH we made, exit temps from the barrel to the bench were over 400ºF and that's on the flue's surface, so I'd gess inside gas would be hotter. So I expected the gas coming out from the barrel to be hot enough for cooking and gess circulating it around a metal box would work. But we're just making experimentation. I'll have to rethink it again a lot
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Post by manuel on Nov 29, 2015 9:47:38 GMT -8
Mine is over the riser and it gets to 450 after a second load of wood. It is all masonry so it has a fair amount of mass. Shortening the riser as suggested by silo makes it much more doable without making a mammoth tower. Hello Joseph, and thanks for your suggestion. I looked for some examples of batch-box RMH with barrel (we do need fast radiating heat), oven and bench, but I found nothing (not much time for internet these days). I'll look for your posts and try to figure if we could make something similar in our project.
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Post by manuel on Dec 6, 2015 1:44:08 GMT -8
Finally we followed your sugestions and made the oven over the riser. Not finished yet but it seems that's the way to go. This thread was a really good starting point: link and we adapted Walker's barrel stoves to our own configuration. We'll keep posting as we go. Have a nice day
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Post by manuel on Dec 26, 2015 5:18:39 GMT -8
Finally we completed the first stage of the building after the numerous trials and errors. Here you have it ready for setup and touches and we hope we could make the cob covering and benches on February. Lots of things we learned with this project. As soon as I have some time to spend on computer I'll let you know about what we found (mostly things than didn't work and things we think we could do to improve the stove. Construction process Picasa GalleryOnce more: thanks for your support and wish you all a -as happy as possible- days with your people.
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Ralf
New Member
Posts: 42
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Post by Ralf on Dec 27, 2015 5:50:39 GMT -8
Hearty Hello to manuel and the forum !
It´s my first post (after a year of becoming a total RMH-addict and reading everything about it) since I´m happy to see that you incorporated a feature I´m also going to do in my first build, which is under consruction these weeks. It´s the crossing and intersecting pipes at the manifold area. My question is: Did you measure the opening by eyeball or did you use a formula ? I figured out a formula for a template that´s glued on the surface of one of the tubes for cutting the opening with a jigsaw (since I don´t have a plasma cutter or other "easy-go" equipment). The shape it produces looks reasonable for different amounts of penetration of the tubes, but I want to be sure if I got it right, also plan to check it with some cardboard tubes first.
I also like your built-in Walker channel, I found that "flat-liner" CO diagram in his thread very intriguing.
Cheers Ralf
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Post by manuel on Apr 27, 2016 0:00:50 GMT -8
It´s the crossing and intersecting pipes at the manifold area. My question is: Did you measure the opening by eyeball or did you use a formula ? I figured out a formula for a template that´s glued on the surface of one of the tubes for cutting the opening with a jigsaw (since I don´t have a plasma cutter or other "easy-go" equipment). The shape it produces looks reasonable for different amounts of penetration of the tubes, but I want to be sure if I got it right, also plan to check it with some cardboard tubes first. Hello Ralf. First of all let me apologize for not answering till now. I've been soooo alzy about the web lately... and didn't came to the forum for so long... We made the opening by eyeball, looking for a transition area big enough for the flue gases to exit smoothly. The flue is open right to his central line so we got the higher surface we could achieve with this kind of junction. This exit was made both for a good transition at this point and for having a clearance opening on the side for the cleanouts giving the benches design needs. We've repeated this junction in our work in progress. A similar 6" batch box without oven. And it seems to work great for the gases and for us to build. I've made the new one cut with a grinder and it went really easy. I couldn't fit it completely well but it wouldn't be a problem at all since we do seal everithing up with cob after the bench's flues are joint together. And now we made the bell with bent iron, thicker enough so we can solder and thread the joints when needed. I'll post photos of the new building soon. Have a nice day and, once again, my excuses. Manuel
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Post by manuel on Apr 27, 2016 0:17:54 GMT -8
Here my friend is soldering some tabs to the 2mm iron flue to be later bolt to the drum (wich will be threaded to acept the bolts on). A nice feature about that jointing is that the 150mm standard flue fits perfectly inside the 150mm thick iron flue, so we get a kinda telescopic joint there, easy to shorten or enlarge to connect to the benches. When we do finally mount this one on his house we could make some good photos of this joint to share here.
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Ralf
New Member
Posts: 42
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Post by Ralf on Jan 17, 2017 4:48:12 GMT -8
Hi Manuel, thanks for your explanations of the barrel-flue-junction, much appreciated. I presented my version of this HERE. Just scroll down a little, it´s the second plenum that´s described.
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Post by peterberg on Jan 17, 2017 7:23:43 GMT -8
Ralf, you mentioned the cutout was calculated with the help of a spreadsheet. Could you provide this spreadhseet for this forum so other people will be able to use it? I'd think it is important, since this construction solves the manifold and first cleanout in one go.
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