osm
New Member
Posts: 1 
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Post by osm on Jan 12, 2020 20:52:35 GMT -8
Hi, peterberg!
How much firewood does your stove burn in one hour?
I want to calculate the approximate power.
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Post by peterberg on Jan 13, 2020 1:05:56 GMT -8
A 150 mm (6") system is capable to burn a maximum of 6 kg (13.2 lbs) of hardwood in about 45 minutes. Tolerance up and down 5 minutes, depending on circumstances, moisture and size of the fuel. If loaded half of that, burn time will be about the same, I am still puzzled why this is. Mentioned burn time is flame phase.
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dvawolk
Full Member
DSR2 125mm open system (actual project)
Posts: 271
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Post by dvawolk on Jan 19, 2020 7:17:08 GMT -8
If loaded half of that, burn time will be about the same, I am still puzzled why this is. Mentioned burn time is flame phase. Hi, Peter. I would think that burn time would be connected to fuel thickness (mainly). So it there is half full firebox and the pieces of firewood are the same, it should burn for a similar amount of time. But if the pieces are just half thick, the burn time should be shorter. |
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Post by peterberg on Jan 19, 2020 8:52:16 GMT -8
I would think that burn time would be connected to fuel thickness (mainly). So it there is half full firebox and the pieces of firewood are the same, it should burn for a similar amount of time. But if the pieces are just half thick, the burn time should be shorter. Hi Klemen, A better definition would be: given the same size and species, full or half full is resulting in about the same burn time. The only explanation I am able to come up with is that the full load burn hotter and faster so the fuel is gone in the same stretch of time. It is still remarkable, since I've seen it in half a dozen of different builds and the pattern has been the same. |
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Post by wisc0james on Jan 19, 2020 17:20:40 GMT -8
In the case of a kilo of 5 cm diameter pieces and a kilo of 10 cm diameter pieces, I think the first should burn substantially faster.
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Post by peterberg on Jan 20, 2020 1:02:26 GMT -8
In the case of a kilo of 5 cm diameter pieces and a kilo of 10 cm diameter pieces, I think the first should burn substantially faster. The smaller pieces burns faster, yes, but not as much as one would expect. The difference between those sizes you mention would be something in the range of 5 to 10 minutes, no more. Certainly not as much as twice over. |
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Post by szczepanek on Feb 3, 2020 9:30:58 GMT -8
That is a perfect system to make a cheap heater ! I had been thinking for a while on how to make a half-refractory half-iron heater that would replace old cast-iron stoves. Now I think I have it. I'll have my testo repaired and I'll build a new prototype in the coming month. Here is the sketchup file of the prototype : www.dropbox.com/s/3z7jm3awdj96azs/2019-08-16_poele_pita_sketchupV8.skp?dl=0Approximate weigth with the plancha and evrything : ~200 to 250 kg. Kind regards, Hi yasin, Any news about that cute little box of yours? Have you built it? |
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Post by Jura on Feb 3, 2020 14:59:36 GMT -8
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yasin
New Member
Posts: 33
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Post by yasin on Feb 17, 2020 0:48:48 GMT -8
Hello all, Jura szczepanekSorry for not giving so much info recently, but I had (and still have) a lot of work to go through ! I'm not hard to reach : contact me via the contact email on my website, and I'll answer you within 24h. I made a lot of trials with that small heater and learned a great deal ! Now I'm working on a bigger version (diam. 200mm, 14 kg of wood per firing). I'm pretty sure now that the secondary air is useless if the primary air is preheated. I also changed a lot of proportions in the oven area (right after the burner) and in the downdraft part and afterward. To my surprise, the sections of the downdraft and under the core where much too small ! The stability of the core depends on the proper movement of the gaz in those areas ! I'll release the drawings of the V2 when we will have our heater B14V5 to pass the EN15250 norm. Kind regards, |
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Post by peterberg on Feb 17, 2020 5:13:05 GMT -8
I'm pretty sure now that the secondary air is useless if the primary air is preheated. That doesn't surprise me, my own experiments with the double shoebox (which incidentally has some aspects in common with your developments) is pointing in that direction. Burning open with a screen in front tend to heat all the passing air up. Result being a remarkable clean burn and O² as low as 8% at some point. On condition there's a space of, say, 5cm between the fuel and the ceiling of the firebox. My development model is just a 125 mm system, so for a larger system that gap should also be larger I presume. I also changed a lot of proportions in the oven area (right after the burner) and in the downdraft part and afterward. To my surprise, the sections of the downdraft and under the core where much too small! The stability of the core depends on the proper movement of the gaz in those areas! Good to see you are also an advocate of lots of space for the gases to move around. The rather limited number of my designs are all done with that aspect in mind. I'll release the drawings of the V2 when we will have our heater B14V5 to pass the EN15250 norm. This is very ambitious! It's quite costly, you are aware of that, no doubt. |
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Post by Jura on Feb 28, 2020 1:07:50 GMT -8
Dear all Can anyone of you see the Peter's charts that used to be visible here(I tried view it with 3 different browsers but to no avail) |
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Post by Vortex on Feb 28, 2020 1:20:12 GMT -8
No, I noticed they were missing recently and thought it was probably just me.
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Post by peterberg on Feb 28, 2020 3:41:44 GMT -8
This is strange... the same here, all my pictures and so on aren't visable anymore. The links in the text are correct, the pictures are in its usual place. I'll try one of the four following the link above to replace with a direct link.
Edit: tried the above and it works for me. I fear one of the providers (probably mine) has changed something so linking to a picture in text doesn't work anymore. I'll investigate.
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Post by Jura on Feb 28, 2020 5:39:29 GMT -8
Edit: tried the above and it works for me. I fear one of the providers (probably mine) has changed something so linking to a picture in text doesn't work anymore. I'll investigate. I cleared my web browser cache & re-entered the the page 12 & 13. The pics remain invisible to me. Maybe you have unintentionally changed privacy/visibility settings of the folder you are storing the pics in? |
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Post by peterberg on Feb 28, 2020 6:56:46 GMT -8
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