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Post by rafael on Dec 8, 2017 11:57:42 GMT -8
I was playing around with this new PVdB double shoebox idea the last days Because of the bricks, sizes are not exactly the same as Peter: Firebox: 550 mm deep / 220 mm wide / 300 mm high Core 440 mm deep / 160 mm wide / 170 mm high Port: 70 mm deep / 176 mm wide / 64 mm high Everything is made with some common firebricks in Spain, brand R.A. (Refractarios de Andalucía) with temperature specs up yo 900º Centigrade. P channel is 60 x 40 mm, 2mm section square pipe In the combustion Core I guess it would be nice to do the lining with 25 mm ceramic fiber board, instead of 30 mm RA firebricks. Much better insulation so I guess higher and faster temperature combustion and also it would match closer Peter size measurements. Today I built and burned one version without the 30 mm RA firebrick lining and it was roaring pretty wild and smokeless after a few minutes. Tomorrow I will try with the 30 mm RA firebrick lining and make some pictures too. In the SKP prototype, the bricks in orange are full bricks. 220 x 110 x 40 mm and 220 x 110 x 30 mm in a slightly darker tone. The bricks that are more vividly coloured are the few ones I had to make some cuts. SKP
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Post by esbjornaneer on Dec 9, 2017 8:15:31 GMT -8
Hello Rafael, Great drawing! I have just started doing the tutorials. Keeping the layout of the bricks the same as Peter has them but using the RA bricks, some on edge and some flat gets the dimentions Firebox D 550mm / W 200mm / H 280mm Tunnel D 460mm / W 170mm /H 150mm all measurements excluding mortar joints, with less cutting. The height of the tunnel can be increased by 40mm by adding another layer of flat bricks to 190mm if preferred The outside will not be flat like yours and it would only be 40mm thick in places.
It all depends on how you are planning to use it, do you want the firebox as an oven? That would be the only reason I would go for such a thick wall of RA in the firebox.
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Post by rafael on Dec 9, 2017 10:43:56 GMT -8
esbjornaneer,I was using flat bricks because i built almost the whole thing stacking bricks without mortar, so this way the whole construction its more stable. Then in the parts where some smoke appears i seal the joint with clay and sand mortar. I didnt plan the oven thing at all. Mostly im trying to learn about this while doing some temporary builds. The idea is building or rebuilding some INTA stoves i built some years ago. Today i put a 580 mm diameter 1000 mm high barrel on top to extract the heat. I had to built a side pile of bricks to help placing the barrel and put the extract pipe on the bottom. It worked pretty well, with no visible smoke after a while. I was working outside, its quite cold here, and the heat of the barrel was very nice.
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Post by Orange on Dec 9, 2017 12:34:31 GMT -8
you could save some bricks if you put them sideways. And if you want extra stability, insulation and airtightness just surround them with Ytong.
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Post by esbjornaneer on Dec 10, 2017 0:29:57 GMT -8
I understand and giving smoke-free heat is always good! Here all the campesinos are burning the olive prunings at the moment and it is a continuous haze of smoke... You are off to a good start sealing smoke leaks up with clay/sand mix. I built the whole of my current bell with RA bricks on edge with clay/ash/sand mix. Here it is traditional with aluminium/magnesium clay (launa) on the roof so that is what I use in the mix. Then I plastered it with the same mix. Just stacking dry does work but there are still lits of air gaps that make the air come from other places than the intended primary and secondary inlets. You can always just clay plaster the dry stack if you want to test. And then when the outdoor testing is done, scrape the clay/sand mix into a bucket/barrel add water and you can re-use it when you build again or move the stove indoors. I think Orange is talking about the 'light weight concrete'/AAC blocks they are a good idea. I got some from Leroy Merlin at one point. I am managing to draw something on SKP but have not figured out how to make the separate brick elements yet... it all seems to be part of the same object. I'll provide my version when completed.
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Post by rafael on Dec 10, 2017 9:36:11 GMT -8
Thanks for the tips, guys!
The purpose of this build was a rough test on this new PVdB design. Both for learning some Sketchup and for building a real model. I use all these bricks because I unmounted a INTA design I was using for the last years. So I have a lot of firebricks! I always use clay sand mortar, so it's nice to unmount and keep the mortar for future builds. This time I was a little lazy to mortar them properly.
Even with all these flaws, like no mortar between bricks and no isolated bricks, the core run better than I expected. I was ready to build a PVdB BBR, but I like the simplicity and ease of build of this new design better. So I will order ceramic fiber board (bricks, board or blanket) and build the core for the stove after christmas. BBR or DSB, I don't know yet
This R.A. Firebricks will be used mostly for the bell, together with magnetite bricks. I have to check this Ytong stuff!
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