|
Post by smarty on Jul 5, 2018 13:40:38 GMT -8
I’ve built it as far as the brick innards and outer layer of bricks. The top is still just sitting get on a ceramic paper gasket. The pizza oven section that is on the side is cut off by a metal plate so it’s only the basic model that is in the sketch up drawing. There’s a bit of smoke coming out a few gaps in the bricks but it doesn’t seem to be rocketing that much. The door has a single opening level with the smaller opening of the secondary air and 45mm forward of it. The door opening is 60x60mm. Perhaps I made it too small? Maybe I should try to make the top and the flue pipe more airtight? Maybe I should wait until I get some 6” flue? I’m away for a few days learning about geopolymer so I’ll have to carry on fiddling with it when I get back. I added a picture to the file: app.box.com/s/24n776ow9ubzagplxtd9rc56vwz5dqhb
|
|
|
Post by satamax on Jul 5, 2018 13:48:39 GMT -8
|
|
|
Post by peterberg on Jul 6, 2018 0:33:39 GMT -8
I am very sorry, but this isn't a dsr neither a batch box rocket. Looking at the port it seems to be upside down and when it isn't, there's a lot of space under the port in the riser. I really can't see how this is supposed to work. When opened during the burn you run the risk of back puffing in my opinion.
|
|
|
Post by Vortex on Jul 6, 2018 0:56:55 GMT -8
Build it and find out, Max. It reminds me of an old woodstove that I have, it never smokes out the top: vimeo.com/278630606
|
|
|
Post by smarty on Jul 6, 2018 1:16:53 GMT -8
Build it and find out, Max. It reminds me of an old woodstove that I have, it never smokes out the top: vimeo.com/278630606I’d wear a face visor when opening too. It could take your face off when opened to reload!
|
|
|
Post by smarty on Jul 6, 2018 1:17:44 GMT -8
|
|
|
Post by satamax on Jul 6, 2018 2:30:53 GMT -8
I am very sorry, but this isn't a dsr neither a batch box rocket. Looking at the port it seems to be upside down and when it isn't, there's a lot of space under the port in the riser. I really can't see how this is supposed to work. When opened during the burn you run the risk of back puffing in my opinion. Peter, i asked you once about the port arrangement of the dsr. You said, air should cross the burning wood. The problem with a vertical batch, is the port being at the bottom. In this case, it is kind of respecting the dsr firebox architecture. Air at the bottom. Port on top. In the case of the dsr, the gases would cross back to the empty bottom part. I left it as is, for the case of drawing. All i see it could add, is more turbulence. Ans since there isn't the crossing back to the front arrangement of the dsr. I added a heat riser. It could may be done with gases comming back down to a big port, at the bottom, feeding a heat riser. But i remember you had trouble with the J tube siphon prototypes. So, this is where it les so far. Top load, top lit. It could work.
|
|
|
Post by sksshel on Jul 6, 2018 14:23:42 GMT -8
I have a couple questions about the "Threshold". Here's a pic of my DSR that I am building. Sitting on top of the p-channel is a piece of 2x2" angle iron cut to match the slope of the floor. My floor extends all the way to just inside the door. peterberg, your pics show the threshold dropping down below the slope of the floor. If I'm understanding correctly, I need to cut the floor so that it AND the p-channel terminate 2" from the door (horizontally). Is that correct? Will the 2" angle iron be tall enough or do I need to obtain some 3" angle iron? The good news is this simplifies the door I was planning. One question on the door. Does the air opening need to be twice the size of the p-channel in order to accommodate both the primary and secondary air? I am planning for a sliding door to adjust the air intake.
|
|
|
Post by smarty on Jul 7, 2018 4:03:44 GMT -8
The top of the threshold should be 70mm above the top of the channel I think. So measured from the flat base of the firebox and assuming 40mm box section is used for the channel the top of the threshold would be 70+40=110mm.
The opening in the door I think has to be 20% csa, I think, - taking flue size as the reference. This will make it about twice the size of the channel. The channel firebox sloping base and threshold all terminate at the same point. The door should be positioned 45-50mm in front of this point with the door opening at the same level as the channel that is behind it.
|
|
|
Post by peterberg on Jul 7, 2018 7:57:58 GMT -8
I have a couple questions about the "Threshold". Here's a pic of my DSR that I am building. Sitting on top of the p-channel is a piece of 2x2" angle iron cut to match the slope of the floor. My floor extends all the way to just inside the door. peterberg , your pics show the threshold dropping down below the slope of the floor. Yes, that happened to be easier to construct in my case. If I'm understanding correctly, I need to cut the floor so that it AND the p-channel terminate 2" from the door (horizontally). Is that correct? Yes it is. The distance isn't critical so it could be 1 1/2" as well. The way you mounted the threshold/doorstep is the other way around, the vertical part should be flush with the channel. Keeping the channel just a tad longer so it sticks out of the side slopes will enable you to use a straight piece of flat iron. Will the 2" angle iron be tall enough or do I need to obtain some 3" angle iron? The 3" would be better in this respect, it'll end at the top of the side slopes this way. The good news is this simplifies the door I was planning. Lucky you! One question on the door. Does the air opening need to be twice the size of the p-channel in order to accommodate both the primary and secondary air? I am planning for a sliding door to adjust the air intake. Air intake approximately 20% to 25% of the riser csa, assuming a round riser. This would be about twice the p-channel, resulting in a 1:1 proportion, csa-wise. edit: Smarty is right.
|
|
|
Post by satamax on Aug 4, 2018 7:22:04 GMT -8
Peter, daft question, did you try vermiculite board for the top shoebox part?
I can't remember how your vermiculite board risers longevity in the small scale développement.
I ask this, because it's time for me to hit the second test phase, on the vertical batch. And i wonder what to use for the back chamber bellow the riser.
Best choice would be insulating bricks. But not cheap.
|
|
|
Post by Vortex on Aug 4, 2018 9:10:51 GMT -8
Vermiculite board is not cheap either. I use it in my experiments for firebox roofs, it develops cracks after a while but lasts long enough to figure out if the design is any good or not.
|
|
|
Post by satamax on Aug 4, 2018 9:52:30 GMT -8
Thanks vortex.
Well. I try to fond cheaper alternative to insulating firebricks.
So, if it doesn't last, it's not good. I did another test few minutes back. Vidéos in my thread.
|
|
|
Post by permaculturebob on Nov 8, 2018 17:31:28 GMT -8
I'm just at a point where I'm ready to start building this double shoebox,or whatever they're calling it now. I'm basically using the build detailed on Permies where the measurements were still rough, in terms of following the sketchup brick placement, with no specific numbers- or at least none I understood, and just using whatever dimension bricks I happen to have. (Standard firebricks and splits)
I remember there was this awesome ratio developed for sizing batch box dimensions based on csa of the riser, now that measurement is gone completely and the tunnel seems to be the new reference point, but exact details aren't really established. (hell, I'm not even sure what the tunnel is yet exactly, although I have my suspicions.
So my strategy will be to build whatever brick bells I want to build, but keep the firebox flexible enough to adjust the innards as more details evolve?
I'm going to reuse the p channel from the bb I just tore apart, but add some vertical height so it goes up halfway through the port? or are the p channel and port bigger than the one I built for the bb .
I'll post this, and will at the same time be going back through this thread to try and make sense out of all the experiments and partial details. So I may be able to glean more answers as I go.
But one thing I do plan to try that may be of some interest, and I got part of the idea from this forum. Is to have two bells- the high temp bell complete with oven and cooktop, and the left over heat going to a bell with a depressurized water tank. Both bells will be insulated inside to keep heat mostly confined for cooking and heating water. Also my exhaust will be assisted with a 12 v fan instead of a standard tall chimney draft. It worked quite well on the batch burner last winter when the bb destroyed the normal startup and mostly smoke free nature of the rocket stove it took the place of.
|
|
|
Post by permaculturebob on Nov 10, 2018 14:21:11 GMT -8
I spent some time and reread everything start to finisg in this threwad, and have a better grasp of what's been done so far. DSR is a nice acronym. Easy to remember.
I also see that my old p channel from the BBR will not be large enough, one more piece of stuff to find, and I've got feelers out for the glass top, but if all else fails I'll get some soapstone and start stacking bricks :-)
|
|