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Post by mhkhankan on Jan 25, 2013 17:30:11 GMT -8
Nice!! I've been contemplating writing this up and you beat me to it. Well done, and thank you. Hi every one, I am developing with the help of peter a spread sheet where it will do the work for you so just wait and you all can have it Including the other info such as P-channel dimensions. |
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dvawolk
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DSR2 125mm open system (actual project)
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Post by dvawolk on Jan 28, 2013 3:20:32 GMT -8
Great, mhkankan - will you do it on online spreadsheet? That would be great!
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dvawolk
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DSR2 125mm open system (actual project)
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Post by dvawolk on Jan 28, 2013 3:51:12 GMT -8
So i did it, based on the dimensions of 6" system that peterberg suggested. The riser is maid of AAC - which is insulative but not hi temp resistant for trying outside is totally okay! I loaded about 8kg of 1 season dried wood - it is not as dry as it should be! Here, beech wood (9kg of wood was a bit more than here) link1Here my batchbox with aluminium p-chanel (20x60x2mm) link2Here are the infos: -first 10 minutes it was a visible smoke (cold start in temperatures of -5°C). -here video 22 minutes after starting a fire. clickand a strange backfire?? at the batchbox primary air entrance?!? click- here flashower at 45minutes of burning. This stage was presend from 30 minutes of burning up to 60 minutes of burning. click-and here a ramhorn pattern from the previous day where the heat riser was not yet covered with metal box. clickFor the first few minutes i opened primary air inlet to about 50 sq.cm. After the end of visible smoke in lowered to about 25sq.cm. The previous day the smoking phase was longer. The fire just couldn't start to burn properly - i thing i had too fat pieces of wood at the lower part of batchbox. I think that adding 3 or 5 thinner pieces of wood below (3cm or 1! inch thick) is very useful for a fire to spread quicker. On top of these on the other hand it is probably better to add fatter pieces (6cm thick or even more) so that there is less burning area and consequentially longer burning time? This burning lasted from starting a fire to coals WO fire for about 80 minutes. Nice! How does it look? I am tempted to lengthen the batchbox to get it 55cm long. If it works weel, that would be very useful to use half a metre wood pieces! Any other suggestions? I am also thinking about my finished sistem with bells. I intended to make a white oven but after reading some posts i would preffer blackoven more. BUT i have one question: If i open a blackoven (located on the 2/3 of height of a first "bell" - in this "bell" there is heat riser also) at the time when the batchbox is burning in flames - will it spill smoke into my room or not? Can i use blackoven only when there are coals only? Cheers, Klemen |
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Post by grizbach on Jan 28, 2013 8:28:44 GMT -8
Hello Klemen!
While watching the ramhorn pattern, I feel the color is too orange. If you let more air into the system it should turn more yellow and put out more heat.
The strange backfire I believe is because of too much coals blocking the airflow so some of the air has to go up and around the wood.
I have found that after the kindling is burnt, you do need small pieces on the bottom to insure a good burn.
My burn box is 52cm long. The longest pieces i have used has been 47cm. I think you could go to a longer batchbox, but then don't fill up the box. Otherwise the burn will be too rich.
I wouldn't want to open up a black oven inside a house. I have never used one, but the gases would be able to travel where they may.
Thanks for posting!
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Deleted
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Post by Deleted on Jan 28, 2013 9:15:25 GMT -8
Can i use blackoven only when there are coals only? Glowing coals are still burning and thus producing toxic combustion gases. Inside a house you can only open a black oven after everything is completely burned or if it is ensured, that the draft is strong enough to keep all gases inside the oven. BTW I think it would be better to light the batchbox from above. As soon as the draft starts it will force the flames downward. This way, there schould be less smoke at the start. |
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dvawolk
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DSR2 125mm open system (actual project)
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Post by dvawolk on Jan 28, 2013 9:58:17 GMT -8
Grizbach, i will experiment with primary air input opening. But after my rocket is inside and built i won't see flames anymore. At that time i can only rely on my previous testings..
But still i would say that a bit more open is still better than a bit less open if we talk about efficiency? Especially if using enough insulated heat riser and batchbox which reaches enough high temperature easily even with some excess of air?
...And when using bell system i can be sure that draft won't help, right?
I will try lighting batchbox from above (near the p-channel?!?)
Thanks for your replies!
Klemen
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Post by Donkey on Jan 28, 2013 10:27:28 GMT -8
Yeah, light it from the top, and if possible the back, on the heat riser side.
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Post by peterberg on Jan 28, 2013 11:27:14 GMT -8
Yeah, light it from the top, and if possible the back, on the heat riser side. Donkey, You and Karl are merely guessing now. At first during the optimization of the stove, I'd have the same thought. But the best way to lit such a stove in order to avoid excessive CO peaks and smoke is different. Put a handful of splinters and kindling in front of the port, light that, wait until the roar start and fill the firebox, smallest pieces first. This way, the stove is producing the least hydrocarbons. Building it up slowly, adding fuel as the fire grows, is another usable method. I've done the measurements, this is no guesswork. See my post from June 18th, 2012. Scroll down to the graphs at the end of that post. Klemen, a p-channel would make your stove much more reliable. |
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dvawolk
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DSR2 125mm open system (actual project)
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Post by dvawolk on Jan 28, 2013 11:42:55 GMT -8
Klemen, a p-channel would make your stove much more reliable. Peter, I already have a p-channel. It is maid from aluminium 60 x 20 mm with 2mm thick wall. Photo attached. It is facing towards the heatriser. |
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Post by smarty on Jan 28, 2013 11:53:07 GMT -8
Hello all, I did a sketch up model of Peter's castable Batchbox design. Hopefully the link will work. It might be of help for anyone else trying to do the castable version. www.box.com/s/judacqj9iejq17o9rka8By the way Peter kindly posted some stuff way back on another castable design this time a j shape. Are there any links to dimensions or models for this one? I wouldn't mind having a bash at making one sometime. |
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morticcio
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"The problem with internet quotes is that you can't always depend on their accuracy" - Aristotle
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Post by morticcio on Jan 28, 2013 12:14:02 GMT -8
Hello all, I did a sketch up model of Peter's cas table Batchbox design. Hopefully the link will work. It might be of help for anyone else trying to do the castable version. www.box.com/s/judacqj9iejq17o9rka8By the way Peter kindly posted some stuff way back on another castable design this time a j shape. Are there any links to dimensions or models for this one? I wouldn't mind having a bash at making one sometime. Smarty, Thanks for posting this. Link works fine - and the model is just what I was looking for to make a castable version. |
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dvawolk
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DSR2 125mm open system (actual project)
Posts: 271
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Post by dvawolk on Jan 28, 2013 12:45:41 GMT -8
I did a sketch up model of Peter's castable Batchbox design. Hopefully the link will work. It might be of help for anyone else trying to do the castable version. Smarty, i added your link to the second post! I hope there will be found easily to others! Klemen |
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Post by peterberg on Jan 28, 2013 12:50:37 GMT -8
...another castable design this time a j shape. Are there any links to dimensions or models for this one? No, there aren't, the full design is never publicized. A small company in the U.S.A. paid for a license of the completed design. So, releasing into the public domain can only been done in about three years' time, provided this company won't renew their license. But you are right, this is a very cute optimized small J-tube stove, capable even of running in so-called pulse jet mode, generating oodles of heat. |
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Post by peterberg on Jan 28, 2013 12:53:56 GMT -8
Peter, I already have a p-channel. Of course you do, sorry, I forgot about it. |
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Post by Donkey on Jan 28, 2013 17:43:34 GMT -8
Donkey, You and Karl are merely guessing now. Ha!! busted! Yep, definitely guessing. It IS how I need to start my stove at home. It's a totally different animal, though I'd think that there would be some similarity. |
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