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Post by Karl L on Feb 28, 2020 3:30:33 GMT -8
Thanks!
Another question: in the video I only see a small amount of wood - do you fill the fire box with wood at the start of the burn?
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Post by Karl L on Feb 27, 2020 11:55:09 GMT -8
Thanks Yasin, that is very interesting.
Where/how does the primary air enter the fire box?
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Post by Karl L on Nov 21, 2019 1:19:21 GMT -8
Peter, do you think it would work to construct a 120-125mm core from 25mm thick insulating firebrick? Or would 25mm not provide enough insulation? (Clearly the riser would be thicker than 25mm -- more like 50mm)
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Post by Karl L on Nov 16, 2019 11:51:04 GMT -8
in my case there were three cracks and only on the upper part and not the brick but the refractory mortar was cracked two were repaired with plaster and mesh Thanks :-)
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Post by Karl L on Nov 15, 2019 3:04:03 GMT -8
my batch box has a single wall for the whole stove and, yes, it does crack. I used the flat brick so the wall is 110mm thick. I gave the plaster I let it crack and then another plaster remained two small cracks.If you can use fiberglass mesh in the plaster Does the brick skin crack in many places, or in just a few? The original question was about the top of the bell - are you getting cracks in the top or everywhere? Thanks!
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Post by Karl L on Nov 15, 2019 3:02:00 GMT -8
It will crack. If you want to save on bricks or weight, metal inner skin, brick outer skin. Thanks for that advice - is there a gap between the metal inner skin and the brick outer, for expansion of the metal? How big should this gap be?
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Post by Karl L on Oct 27, 2019 13:18:36 GMT -8
Orange,
Is the 2KW for the DSR2 the *average* output from the bell? It's not very informative to compare this to the *rated* power output of the box stove, which it only produces when it is burning wood.
In order to compare the two stoves meaningfully you need to take account of the amount of wood being burnt in each to produce the same average power output.
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Post by Karl L on Aug 20, 2019 6:35:37 GMT -8
Protip: you can diagonally scale Peters .skp file in Sketchup, dimensions seem to match. Yes, that's correct. In fact, I scaled the original drawing of my 125 mm system up this way to 150 mm. It's a trick to do that properly, it could help to go into edit mode of the object to be scaled and use the dimension tool to show the diameter of the riser. Using the scale tool then, the dimension will be scaled up at the same time until the desired size is achieved. Not good for a brick core, though. It would be interesting to have a film made in SketchUp showing this process, seeing it happen is quite revealing. I scaled the 150mm version back down to 125mm using the Scale tool and numeric entry: First calculate the desired scale: 125/150 = 0.8333. Then select the whole core. Then hit 'S' for scale and start dragging one of the corners: the scale varies with the mouse movement. At this point you can enter the scale you want *numerically*, in this case type the digits: "0.8333". Then hit Enter and it applies that exact scale.
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Post by Karl L on Aug 18, 2019 3:26:31 GMT -8
Here's a DSR II open system Calculator. I've left the stumbling block dimensions fixed at 50x40mm, like in the drawing.
Thanks, Orange, but I am getting '403 Forbidden' error on that link...
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Post by Karl L on Aug 17, 2019 14:10:09 GMT -8
Just to clarify: my post above was in support of Peter's explanation.
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Post by Karl L on Aug 17, 2019 11:48:33 GMT -8
You know, the double shoebox sports an exit which is a little bit larger than the port. The overall effect is that the maximum speed in the port is limited, preventing the thing to go berserk. That would clearly violate the laws of physics. Fluid systems are limited by their smallest cross-section, not the larger ones. The temperature of the gas will have an effect. If the gas is hotter then it will have a greater volume (at constant pressure), and so be restricted more by a given aperture. The temperature of the gas at the exit is likely to be higher than the temperature of the gas at the port, because of the secondary burning. So, the exit port could be the limiting cross section.
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Post by Karl L on Aug 16, 2019 5:36:49 GMT -8
If at all possible could you draw up a 6 inch core showing the closed system version? I have followed this tread closely but have gotten a bit confused about the side air intakes. I'd put it on the list but please don't hold your breath since it isn't top priority, maybe done in a fortnight? All ice, weather and health permitting. Hello Peter, Can you give a short verbal description of the how the closed system is different from the open system? (I understand how to construct the door, side air intakes and floor channel.) Are these the only other changes: 1. Remove the stumbling block? 2. Lower riser floor? Thanks
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Post by Karl L on May 22, 2019 5:19:52 GMT -8
I've used rock wool to insulate the walls of a normal wood stove - much lower temperatures than a heat riser - and it fell apart very quickly.
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Post by Karl L on Apr 7, 2019 11:47:56 GMT -8
Peter, do you have time to sketch a cross section of the top box? I don't understand the position and size of the brick that descends from the ceiling of the top box from the written descriptions.
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Post by Karl L on Dec 19, 2017 10:36:42 GMT -8
Mix clay/sand 1:3 by dry volume. Thanks, Matthew Do you start with dry clay powder? Just wondering how you mix it, otherwise.
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