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Post by matthewwalker on Mar 31, 2015 14:10:41 GMT -8
Here's what I've been doing for the last few months....  It's based around a core that utilizes my air settings developed over burning in my home batch this winter. I've been speculating on how the lower velocity should allow the removal of the riser. After my visit with Max and Lasse and the crew from Firespeaking this winter, I came home super inspired to follow through with this and try to finalize a design to fit their Cabin Stove 2.0 format. I'm putting the info up on my Walker Stoves site, here it is.... walkerstoves.com/walker-riser-less-combustion-core.html  I'm super excited to share this core with you guys, hopefully someone will cobble one together here so we can compare notes. I've been living with it for a month or so now as my cook stove and it's really a wonderful heater! |
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Post by ericvw on Mar 31, 2015 17:22:19 GMT -8
 Dang it, matthewwalker! That is totally freakin beautiful!!! No wonder you've been hit or miss lately! WOW, WOW, WOW! No door? Or I'm missing something? Man, I love that stove. Great job, Matt... Are ya pickin up what I'm laying down?! Eric VW
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Post by PNW Dave on Apr 1, 2015 3:02:53 GMT -8
Just awesome! I've been wondering what the project you've been working on, but haven't told us about yet, was.
Hoping for a video demo of its operation, from loading to cooking, I'm interested!
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Post by matthewwalker on Apr 1, 2015 6:56:17 GMT -8
Thanks guys, yeah Dave, I will get a video up soon here. Eric, door is on the other side so it's near my other hearth to minimize wood mess and for added living room ambiance.
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Post by grizbach on Apr 1, 2015 8:42:43 GMT -8
Dang Matt!
From experiment to permanent fixture in a couple months!
It's awesome that you have the tester to monitor performance.
I also am waiting on a video.
p.s.
(this may take the place of a horizontal riser I was going to experiment with)
Terry
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Post by byronc on Apr 1, 2015 13:28:44 GMT -8
Nice work Matt! H'm, that's got me thinking, wonder how much optional mass (bench or bell) it could drive? My interested is in building a dual purpose heating/cooking barrel-less RMH, with at least a two pot cook surface positioned at convenient height, to heat about 900 square feet.
Very nice metal work for the stove top also. Looks like ceramic glass cook surface on the left hand side.
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Post by matthewwalker on Apr 1, 2015 14:22:52 GMT -8
Yes, ceramic glass cook top on the cook side, and I will have one over the oven as well once I come across another. I paid $5 for the one I have, they work amazingly well.
I'd be really excited to see any of you guys give this one a try in a heater build. This core opens up so many options for barrel less and low height builds. Bryon, I expect it can push about the same as a PvdB batch. Both are susceptible to low draft, but as long as there is good pull from the chimney they can drive a lot of mass. Right now, the thing is way under loaded. I may remedy that this summer with a bell/bench, or maybe not.
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Post by ericvw on Apr 1, 2015 14:32:02 GMT -8
matthewwalker, I'm still in awe! What a beauty. It be nice to try one out, but heck I still haven't built my morticcio style batch yet  ... So for anyone else thinking of accepting your "challenge" is the Sketchup available? Incredible piece of functioning art! You... are... the Man, Matt! Eric VW
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Post by matthewwalker on Apr 1, 2015 14:44:36 GMT -8
I don't do sketchup, I'd rather just build the thing and see it burn rather than speculate. Now that I think about it though, it would be a good way to share it with you all who do. If anyone wants to take a crack at mocking up those layers I'd be happy to give dimensions as we go. Here's the core layout for those of you who missed it: walkerstoves.com/walker-riser-less-combustion-core.htmlShould be everything you need to stack one up... |
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Post by photoman290 on Apr 1, 2015 15:51:41 GMT -8
great design matt. trying to figure if i could fit one into the yurt rather than a drum design. i like the low height, the limiting thing in the yurt. i wonder how long the flue could be as i don't want to have it exiting though the roof if possible.
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Post by matthewwalker on Apr 1, 2015 16:37:51 GMT -8
Judging by the loads I've put on it, I'm planning on it pushing about equal to a 6" J. I've run it with one 2'sq. wet brick bell into a full bare 55 gallon drum, all after the cook top, and it had a lot of energy left. It will require strong draft at the chimney and you can't shut it all the way down, as it requires a certain velocity through the combustion area to work.
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Post by DCish on Apr 2, 2015 4:59:18 GMT -8
Sweet! Much like Griz, a horizontal "riser" test was on my agenda for the spring. Your work saves me the trouble, and has testo validation to back it up, a huge plus. Looks like just the core to put next to the bench I built this past winter. I really like the slower burn option to add nuance to the heat output pattern.
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Post by peterberg on Apr 3, 2015 4:01:55 GMT -8
Matt, it sure looks like good progress. Not to put a downer on it, far from that, but the Testo diagram on your website is not as good as it seems to be. The CO level is dependent on the O2 level in a big way. The more oxygen, the less carbon monoxide. O2 level is quite high, so the CO is not as low as it seems to be. Please look at the undiluted CO in the Testo spreadsheet and you'll see what I am pointing at. When the cook stove is airtight built and the O2 level much lower, like less than 8% and the CO is still down low that would be the true moment to jubilate.
All in my opinion of course.
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Post by matthewwalker on Apr 3, 2015 6:41:54 GMT -8
Thank you for the input Peter, I am hoping to purchase the materials I need to shore up the air leaks before next burning season starts up and refine the build a bit. I was rushing to get something together to use as a test bed, so there are some details to attend to and that's a big one. You've inspired me though, so who knows, maybe I'll get motivated and get something up before too long.
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Post by patamos on Apr 3, 2015 21:31:18 GMT -8
Matt - ya killed it  Well, if an optimized batch box configuration, particularly secondary air feed, and a decent enough chimney stack can keep things flowing (and bring down particulate matter to boot)… it might be time to reassess the definition of a 'rocket' heater. Does it sound at all rockety? Or is this better defined in the category of masonry heaters? Or... is there a new category on the horizon? Interesting times... I might have missed some details on your web site, and/but can you speak to the performance of the oven? |
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