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Post by fasardi on Nov 25, 2019 4:22:02 GMT -8
Hi to all! I´m about to start a build, i was planning to do a BBR8 and wondering about doors, glass and secondary air (i'm not the best welder, and certainly like to save a few bucks) and i come across the Open DSR2 and loved it! So i alredy bought some refractory half bricks, because the full bricks were too expensive, and i was planning on building the core with Ytong bricks and the half bricks inside. But i red the full DSR2 post and have some doubts about isolation. It is bad to isolate the two boxes? Is isolation only needed in the riser? and another idea came across my mind, is it possible to do the top box with only Ytong or red brick? Thanks in advance
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Post by Orange on Nov 26, 2019 13:07:03 GMT -8
as I read on this forum insulation is not necessary for clear combustion on larger systems but insulated riser helps with startup. I used 3x lighter ytong - multipor for insulation behind firebrick splits and its perfect but it cracks so you need something to hold it.
for the top box - red bricks or ytong plastered with clay mortar may work if you want to experiment.
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Post by peterberg on Nov 27, 2019 1:28:58 GMT -8
But i red the full DSR2 post and have some doubts about isolation. It is bad to isolate the two boxes? Is isolation only needed in the riser? and another idea came across my mind, is it possible to do the top box with only Ytong or red brick? No, it isn't wrong to insulate the two boxes. My initial development model entirely existed of insulative materials. The problem there is that the fire was developing very rapidly from a cold start so it wasn't easy to keep it from over-fuelling. Some mass inside the firebox is good in this respect. Don't stack the fire bricks without mortar in the Ytong box, heat will get to the Ytong through every crevice with devastating results. I am unsure whether or not the Ytong blocks are sufficiently heat resistant as a back insulation. It's definitely not a good idea to use this material for the top box without refractory lining. Even about red bricks I have my doubts, direct flame inside the top box is quite common.
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Post by fasardi on Nov 27, 2019 10:55:24 GMT -8
Thanks for the help! i guess i´ll use refractory in the top box too.
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Post by fasardi on Dec 23, 2019 8:28:43 GMT -8
But i red the full DSR2 post and have some doubts about isolation. It is bad to isolate the two boxes? Is isolation only needed in the riser? and another idea came across my mind, is it possible to do the top box with only Ytong or red brick? No, it isn't wrong to insulate the two boxes. My initial development model entirely existed of insulative materials. The problem there is that the fire was developing very rapidly from a cold start so it wasn't easy to keep it from over-fuelling. Some mass inside the firebox is good in this respect. Don't stack the fire bricks without mortar in the Ytong box, heat will get to the Ytong through every crevice with devastating results. I am unsure whether or not the Ytong blocks are sufficiently heat resistant as a back insulation. It's definitely not a good idea to use this material for the top box without refractory lining. Even about red bricks I have my doubts, direct flame inside the top box is quite common. I´m thinking about another (cheaper) alternative, ceramic hollow bricks. I know that`s not the best isulation material, but it`s cheaper than Ytong and probably even more durable. If I use them, I`ll put the refractory slabs in the firebox and the bricks outside, and maybe even use those bricks to build the bell as well, i have to compare costs with the red bricks. Has anyone tried that?
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Post by Orange on Dec 24, 2019 1:40:55 GMT -8
yes, brick is around 0.2 w/mk and ytong 0,1w/mk and multipor 0,045 W/mk
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Post by peterberg on Dec 24, 2019 1:59:32 GMT -8
I´m thinking about another (cheaper) alternative, ceramic hollow bricks. I know that`s not the best isulation material, but it`s cheaper than Ytong and probably even more durable. If I use them, I`ll put the refractory slabs in the firebox and the bricks outside, and maybe even use those bricks to build the bell as well, i have to compare costs with the red bricks. Has anyone tried that? As insulation around the firebox, OK. As walls of the bell, not OK. You want mass in the bell's walls, not air. You could use those if you have a good way to fill those hollow bricks with concrete, clay/sand or whatever.
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Post by fasardi on Jan 9, 2020 6:04:33 GMT -8
Well, i will use it to isulate the firebox only, and red bricks in the bell's walls. I was checking with the sketchup and trying to cut the minimum bricks, and i have some doubts: Reading in the forum I believe I saw than there is some room to tweak the dimensions of the firebox and the top box, i did it but tried to have the same cross section area in each box. And I extended both boxes 25%. So my system will be a 150 mm, and the dimensions will be: Firebox: W: 208 H: 340 D: 540 Top Box: W: 196 H: 240 D: 540
The only problem than I saw is that the space between the end of the riser and the walls of the top box is only 23 mm, and in the sketchup from Peterberg, for a 120mm system that space was 30mm. I prefer to do more brick cuts if that change the behavior of the stove.
And something more, as i'm doing an open DSR2, because i don't want to do a door, I was wondering if I can make the top box inaccessible, closing the front with bricks, or having a door there is mandatory for cleaning purposes or something like that.
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