Ok so I have managed to get a week to finally start work on my little 125mm/5" batch box for my garden.
I figure that, seeing as I really want to build these as part of my business, I should try to go as user friendly and tech forward as possible. Therefore I reckon the Walker tube for secondary air seems to be the best option.
Do we have any hard dimensions to work from yet and do you think I could get away with using a bent copper tube as I have tons lying about and the tools to, mostly, work it.
Steel I would have to get fabricated though I also need a door which might have to be made as well, so not the end of the world.
Ok so after reading through what Mat has posted it seems 9% of system size is what we are looking for. So 130mm/5" system would need 1540mm2 csa for secondary. Therefore 40mm id square mild steel tube for horizontal and 40mm id circular tube for vertical. Sound about right?
From what I read, it doesn't really matter. I think Matt used a 1/4" slot that was about 3" long. The air came out mostly near the bottom of the slit. That's just a guess though. He would have to weigh in to get the actual dimensions.
I would be a little concerned that the copper won't hold up to the heat. If you start getting around 1000C, you will get localized melting. You will get serious oxidation well before that. Steel melts at about 300C higher than copper. I believe copper will be much less durable than steel in this application, and I think Matt has burned out at least one of his steel rigs. Copper might be okay to test the concept, but for long-term use, you will want something more durable.
I'm not the expert, but those are my thoughts. I would consider some high temp-rated stainless for the longest durability.
Yeah I was gonna use copper as I had some but just found out my mate has a nice little metal shop set up so we can fab the door and steel tube there. Yay! I was most interested to find out what Matt's experiences had been since his last posts but he doesn't seem to be around at the mo. Especially az I am going for 130mm rather than his 150mm batch
Post by philippeelskens on Feb 17, 2016 6:54:35 GMT -8
I have a question about the Walker dimensions when scaling down the system, when going from 6" to 5" riser diameter: Do I scale down the primary inlet 2 sq inches x 5/6 = 1.67 sq inches OR ((square root 2) x 5/6) ^2 = 1.46 sq inches
I have a question about the Walker dimensions when scaling down the system, when going from 6" to 5" riser diameter: Do I scale down the primary inlet 2 sq inches x 5/6 = 1.67 sq inches OR ((square root 2) x 5/6) ^2 = 1.46 sq inches
linear dimensions will be proportionnaly reduced 5/6 ,surfaces in square proportion and volume cubic proportion yes
deadstarsstillburn: moreover, the house has 3 storeys (large attic) so I assume if I get very efficient heating on the ground floor, that will go a long way toward heating the upstairs as well, no?
Oct 21, 2020 6:53:59 GMT -8
BenAlexanderT: Happy new year everybody. I wish you the best
Dec 31, 2020 15:06:14 GMT -8
Solomon: Anybody in Southern Oregon, in Jackson or Josephine counties?
Jan 16, 2021 21:54:43 GMT -8
gnomedome: i realsie this is from 2009
Apr 14, 2021 8:30:44 GMT -8
gnomedome: i realize this is from 2009 id love to see the photos from this ..as im looking to build a sauna soon similar to this .... if anyody sees this post obomartin@gmail.com..... the photos in this post did not show up
Apr 14, 2021 8:32:00 GMT -8
dcoyte: I am planning to use a cast iron heat exchanger out of a hydronic boiler set on top of my rocket stove, flue out the top. There will be a pump moving the water through the heat exchanger into an unpressurized 2000 gal tank. Any thoughts?
Dec 31, 2021 6:45:55 GMT -8
syekoms: Yes just found this forum am in Josephine county.
Jun 17, 2022 12:53:32 GMT -8
ecoenergyman: Hi new to forum I was wondering where to buy a masonry stove kit I could install myself ? Fran in ireland
Aug 1, 2022 17:39:58 GMT -8
natureman: I have been following this site for years
Aug 28, 2022 10:58:59 GMT -8
nendo: Can anyone on this forum point me in the direction of detailed plans for a rocket water heater please?
Oct 22, 2022 15:15:43 GMT -8
fierolepou: Hi everybody! Starting a project from scratch, this is a goldmine!
Dec 10, 2022 5:20:09 GMT -8
Solomon: Best way to not die in a house fire is to build a stove where the really hot stuff isn't near the flammable stuff.
Jan 10, 2023 11:34:39 GMT -8
beppe: Hi to everybpdy. I'm new about the rocket stoves and this forum
Aug 30, 2023 22:17:32 GMT -8
beppe: I have a living room+ kitchen of 75 square meters that was heated by an ordinary pellet stove with a power of 8KW.
Aug 30, 2023 22:19:29 GMT -8
beppe: I want to switch to a DIY pellet rocket stove but I haven't found yet a project that is really suitable for my situation. Is there anybody able to indicate to me a good detailed project?
Sept 4, 2023 9:05:15 GMT -8
sksshel: Yes, very happy with my DSR2. I had not heard about the DSR3. I probably won't be using it but I will look into it.
Oct 16, 2023 9:15:37 GMT -8
rockinon: I have some questions about a Rocket Mass Heater, as I am in progress of getting a place built in Arkansas in the mountains of NW Arkansas and it will be very helpful. How can I add pictures to illustrate what I am requesting
Jan 23, 2024 11:01:07 GMT -8
dd24: Bonjour, Quelqu'un expérimente t-il sur les poêles "bubafonya" ou "stopuva"? merci pour votre réponse!
Mar 2, 2024 10:32:32 GMT -8