|
|
Post by peterberg on Mar 10, 2020 6:05:16 GMT -8
Hmmm... it's just five days ago that the cooking range was operative but not completely dry. I dont expect it to be completely dry within a week, a month would be more realistic.
I didn't know you used the video of the cook stove I built in Missoula as reference. Trevor is right, that one is a DSR1, being entirely different to DSR2. I abandoned the #1 project because of its inability to burn at a constant rate. I.e., it tended to overfuel quite easily with black smoke and all. What I would do now is test it with a restricting end port as in the DSR2. The Missoula build is special in that it sports a long afterburner path plus a dowdraft exit from the cooking plate area. The entire afterburner path is done in Skamol insulative firebricks, by the way.
The drawing of that DSR1 cooking stove is also available if you want it.
Sorry, I wasn't really aware of what you were planning, otherwise I would have asked for the complete sketch of the appliance. Maybe it's best to make the sketch and post it so we can evaluate it.
|
|
|
|
Post by Jura on Mar 13, 2020 15:13:02 GMT -8
I thought that might be an issue when I saw what you had built. Paul Wheaton's is a DSR, the firebox exit port is directly underneath the cooktop. It's like a blowtorch of flame on the bottom of the hotplate. gosh!I'm really angry at myself for not having paid attention to the fact that the Paul's range had thre DSR I core. In a DSR2 the heat has farther to travel before it gets to the hotplate, so more opportunity to diffuse into the gasses and masonry while in the afterburner. The hot gasses coming out of the DSR2 afterburner exit port are not going to be as hot as the jet of flame coming out of a DSR firebox port. Thanks.I'm just sorry I was not explicit enough in my first post describing what I was planning to build. I thought the temp range would be one of a standard batchbox after the heat riser. btw. have you got some more charts from your stove? There is a good chance we will refurbish the range before next winter and maybe my friend will trust me again. Isn't the issue the distance between the exit port and the cooktop? From the photo showing the stove without the cooktop it looks like the distance is something like 20cm. It might be also this factor. I told my friend there had been cases when 1,5 cm steel cooktop got bended and taht plate shall be placed at the "system distance" (15 cm) from the exit port. I don't know why he made it 23 cm (probably to avoid cutting) |
|
|
|
Post by Vortex on Mar 13, 2020 16:19:48 GMT -8
That's a shame, if I'd realised what your plan was there I would have warned you.
I have about 100 charts saved from around 125 burns over the winter. Lots like the last one I posted. I'll be writing the thread up soon as the fire lighting season is winding down here now. This last week I've been experimenting with different thresholds.
|
|
|
|
Post by fishalive12345 on Mar 13, 2020 23:22:48 GMT -8
The layout and appearance of your stove are very appealing. It's a very useful reminder to someone like me that unless you are very closely following a tried and tested design you may well have to go back and make changes to your build.
A question for Peter, Trevor and others with expertise, could the distance between the exit port and the cooktop be less than the system size, 15cm in this case?
The reason I ask is that I'm also planning/building a cookstove.
|
|
|
|
Post by Orange on Mar 14, 2020 0:23:44 GMT -8
Jura, as I see your riser is 214x168mm, which is bigger than 150mm system size.
And I am thinking, if J-tube works with 5cm top gap, BB may work well with 10cm top gap.
|
|
|
|
Post by Vortex on Mar 14, 2020 3:14:17 GMT -8
A question for Peter, Trevor and others with expertise, could the distance between the exit port and the cooktop be less than the system size, 15cm in this case? The reason I ask is that I'm also planning/building a cookstove. I've never built it so can only guess based on similar experience. First I'd make the top chamber completely out of insulating firebrick or fiberboard. Then I would probably make the exit port a 1 CSA circle, and fine-tune it by adjusting the distance between the top edge of the opening and the bottom of the hotplate - so that effectively became the port. It would need enough space all around the exit hole under the hotplate, but then I think you'd be able to get it quite close. |
|
|
|
Post by patamos on Apr 8, 2020 11:01:36 GMT -8
One thought would be to widen your port at its existing height, then add 1 or 2 or 3 insulated firebricks above that to gradually narrow it. Staggering/corbelling the bricks to make a mini heat riser will evoke some pressure gradients, turbulence and possibly better mixing of gasses in the taller throat. This is a technique often used in larger masonry heater firebox exit ports/throats. If you place the bricks loose you can play around with configurations to get it dialed. And you should at least be able to get a concentrated blast of heat under the cook top my 2 c  |
|
|
|
Post by Jura on Apr 15, 2020 5:32:40 GMT -8
One thought would be to widen your port at its existing height, then add 1 or 2 or 3 insulated firebricks above that to gradually narrow it. Staggering/corbelling the bricks to make a mini heat riser will evoke some pressure gradients, turbulence and possibly better mixing of gasses in the taller throat. This is a technique often used in larger masonry heater firebox exit ports/throats. If you place the bricks loose you can play around with configurations to get it dialed. And you should at least be able to get a concentrated blast of heat under the cook top my 2 c I love your 2 c :-). thanks. Somehow I can remember your post about vortex single switch back firebox where you added some piece of a ceramic insulation right above the exit from the firebox so as the cook plate was not directly exposed to the blast. I'll have a chance to give it a try when I'll be building this core for myself. My friend who we build this core for decided to replace it with another (but still efficient one) I must say I hate playing with different setups without having some gas analyzer. (For next 2 coming 2 years this toy will be out of my financial range) |
|
