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Post by peterberg on Dec 21, 2023 3:34:00 GMT -8
OK, this is the latest state of affairs. The riser port is 47 mm wide now, together with the height you have there it's 70% of chimney csa. I enlarged the liner thickness left and right of the port to 25 mm, half a cemtimeter more than what I have here won't make much of a difference. Besides that, it's hard to make superwool thinner! The door frame assembly is correct now, the air channels and so on are 50-30-50 proportionally. Note the frame is wider than the firebox, that is alright this way. The frame to hold it in place won't need any bolts, it'll stay in place like it is drawn. Between the door frame and the refractory core there should be a layer of 13 mm superwool, compressed to about 10 mm. Also in the drawing. The door assembly itself is quite straightforward, the only complicated part is the air inlet. This is done in such a way that it can be open or closed, nothing in between. To open it in real life: lift the valve up a bit and pull it towards you. Now you will be able to let it hang down the front of the door frame. The glass in the door should be separated from the steel by means of a strip of woven glas tape, also on the steel where the glas is resting on. The glas can be hold in place by means of four small steel angle profiles of 15x15x1.5 mm, not drawn. Fixed to the door with just one small bolt in the middle of each side. This is just a drawing of how I would do it. pberg0.home.xs4all.nl/pictures/dev2023-2024/third%20parties/ Use the link and look for the file "shorty5B.skp" |
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Post by independentenergy on Dec 21, 2023 8:36:56 GMT -8
thanks for the drawing, now with this setup do you think you will do other tests with an open hearth?
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Post by peterberg on Dec 22, 2023 2:38:26 GMT -8
Hmmm... I spent quite some time on drawing a door assembly, specifically for your convenience. In my mind, this last question is over the top.
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Post by independentenergy on Dec 22, 2023 3:28:05 GMT -8
yes Peter, it was just a curiosity, to try to understand if it was your intention to develop the system in that sense too, that's all.
I ordered the tubing for the door and will start construction as soon as possible.
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Post by independentenergy on Dec 29, 2023 12:00:43 GMT -8
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Post by peterberg on Dec 29, 2023 12:43:33 GMT -8
What's the height of your port? For a 130 mm system, it should be very close to 200 mm. In the first picture, it looks like it is lower than two bricks on its side. One of the two, your bricks are much wider than 100 mm or your port is too low.
The slits in the door frame posts should start at half the firebox' height. In the picture, it looks like the slit is half the height of the door opening, which isn't the same as the firebox height.
Just observations, I might be fooled by the pictures' perspective.
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Post by independentenergy on Dec 29, 2023 13:26:05 GMT -8
yes Peter the height of the port is 197 and 47 wide.
the bricks are 110 high.
for the slots in the uprights they are exactly like in the drawing you sent me
to be precise, the side slits start at 140mm, the firebox measures 280.
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Post by peterberg on Dec 29, 2023 14:08:24 GMT -8
This must be correct then, still good to ask questions. Half of the time there's a discrepancy, the other half there isn't, like in your case then.
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Post by independentenergy on Jan 21, 2024 6:50:27 GMT -8
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Post by peterberg on Jan 21, 2024 9:38:45 GMT -8
I was wondering.... if anyone uses perlite to insulate the firebox? Can be done, it surely helps. Mix the perlite with some clay and wet it sparingly before filling voids with it. This way, the solidifying clay will prevent the perlite from sagging out. |
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Post by independentenergy on Jan 21, 2024 9:47:13 GMT -8
I was wondering.... if anyone uses perlite to insulate the firebox? Can be done, it surely helps. Mix the perlite with some clay and wet it sparingly before filling voids with it. This way, the solidifying clay will prevent the perlite from sagging out. Do you think superwool is preferable? |
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Post by peterberg on Jan 21, 2024 10:17:34 GMT -8
Do you think superwool is preferable? Using superwool is easier, provided you are able to find the hardware cloth or chickenwire to fix it into place. |
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Post by independentenergy on Feb 16, 2024 4:38:13 GMT -8
I did some tests of this core, ran it for three consecutive days and then tried several cold starts.
I must say that my bell needs a bypass with this core, while it was not necessary for the j tube that I used before.
Starting from cold is difficult, it is reluctant to gain temperature, I am also afraid of the slightly damp wood, it is not a Rocket Stove and the chimney for this core is important.
But when it starts and gets hot it's quite impressive, not so much for the noise it makes but rather for the heat it develops and the duration of the charge.
I have reached cooking plate temperatures above 400 degrees with averages above 300.
I managed to heat my tavern and was able to boil water in a few minutes.
I noticed that the door and the core itself heat up a lot, the door frame exceeds 300 degrees, the external part of the core also reaches 400 degrees.
Combustion lasts about 45/50 minutes depending on the wood, I noticed that the next day some unburned coal remains at the bottom of the combustion chamber.
the final port is set to 100% CSA.
it's different from a batch box, everything works slower, it doesn't have a bad roar but the combustion lasts a long time and the heat is high, for now I'm satisfied I just need to improve cold starts.
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Post by independentenergy on Mar 2, 2024 23:55:18 GMT -8
there were some small deductions in the tests I did.
the heat inside the core is very high, the outside also gets very hot, I decided to make an oven above the core, and a socket on the wall that enter the hot gases as soon as they come out of the riser.
I noticed that the chimney temperature is quite hot, I'm afraid that my ISA is too small I know it reached 160/200 degrees in the chimney, too much for my taste.
Now I'm adding the oven if this isn't enough I'll try adding ISA, a bi-pass and changing the gas outlet because the second bell which should heat up and release heat doesn't heat up enough.
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