Peter, did you put the testo on your institutional stoves? Did you make any changes to the combustion chamber?
Yes, I've tested one of those but to my mind the oxygen level was far too high. That's why this type of stove yield very good results, the exhaust gases are greatly diluted. No combustion chamber changes, though. Don't hold your breath, a 4" J-tube would be probably all you need for this application. And those are notoriously difficult to get right.
I did some testing with a 3" j. The ratios change (much longer riser relative to burn tunnel length and system size compared to a 6" system) but the thing burnt twigs at a ferocious speed with a mighty roar and no start up issues. I'll redo my experiment and post some pics and dimentions over the weekend
Hi my first post after following the forum for a while.
I wonder if this type of stove would work better if the gasses first go up the insulated outer cavity and then come down the inner cavity in contact with the cold surface of the cooking pot. Is it not true that when hot gasses cool down they become heavier and that as much as possible we want to be using this to help drive the stove?
Here it is wrapped in a ceramic quilt. I didn't want to cut the ceramic for the test. The draw is better, lighting is even easier and it burns clean almost instantly. Here i have opened up the insulation to show the glowing red pipe within.
Next experiments: how well does it cope with the resistance of a heat exchanger with a resistance similar to the institutional stove? How much wood does it burns in how much time, (to get an approximation of its power)?
Im not sure if i can find a good way to cast it. I was thinking of doing it donkey style and using that pipe as a sacrificial former, but i might have trouble getting shards of metal out once it does fail. Cardboard tube would probably work better, and if i think the ridges are important, wrapp the former in string
Yes, i don't know why i had dismissed using bricks. Maybe I'll try and set up a quick test with the old house bricks that i have. I'm guessing 3'x1' with 4" square system size, and if i have trouble with it i can shorten the fire chamber. Bricks like this i guess would be ideal
There is a quick sketch of how this thing might be implemented with insulating fire bricks (no attention given to the number or size of bricks). When i drew that i was imagining the fire box being made of metal, like a can riveted to the outside of the barrel in which i could drop a piece of kit paper then a handful of sticks. Thinking about it, that can would both lose a lot of heart from the fire, and get very hot. So here is the redesign
A big advantage of brick is that it will support the weight of my pot
Ah cool, I'll ask them about delivery costs. Falling that, my fiancee was talking about sending her parents to France to buy wine for the wedding.
I know I'm getting a bit ahead of myself, but this is a drawing of my fantacy cooker. It's not just for my wedding. I'm part of a group of permaculturist types taking over a veg box farm, so as we have a captive market of 100 veg box customers it would be good to be able to make jams, pickle, bread and beer to expand the business, so a wood fired commercial size range would have many uses
I am worried that peter has suggested that a 4" j probably wont work, but i dont understand why it wont work. If i can make these little j's work in these systems i think the fires will be easier to manage, will burn hotter, and do a better job of controling excessive airflow through the system to make for a more efficient heat transfer. On the other hand, theres a lot i dont know, and no doubt aprovecho spent a bunch of time on the design of their L shaped combustion chamber, and designing their whole stove to work well with it, so i would probably be wise to abandon this 4" j idea and just follow the aprovecho design as accurately as i can
martinm: any one here with info \ experience with heat (from a mass heater) distribution with ducts throughout two storey house ?
Sept 8, 2018 22:58:52 GMT -8
padica: Good morning, this is a wonderful subject, please someone can help me with the theme of double and triple combustion, how it is achieved, theory and design, thank you
Sept 15, 2018 7:13:40 GMT -8
wiscojames: I'm afraid you won't get a response to such a vague question - I suggest reading through some of the threads related to your questions before asking for an explanation. People will be very generous with their knowledge if your question is more specific.
Sept 18, 2018 4:48:00 GMT -8
daniel: in my experience as I am working now on something of that nature, I have thought of making a heat exchanger and distributing the heat through vents using a slower fan. Now after a few years I realize that mass heaters give out primarily radiant heat, for
Nov 30, 2018 12:48:38 GMT -8
coastalrocketeer: Anyone posting in this shout box... if you have something you want people to see and respond to, create a thread in the appropriate forum section... this is not the place...
Dec 16, 2018 18:10:49 GMT -8
vesuvius: High Temperature Glass options,
Jan 4, 2019 16:28:17 GMT -8
vesuvius: Do any of you have experience with using the glass from home oven doors on a rocket stove? I'd like to have a viewing port on my stove but don't want to fork out for new ceramic glass. Any thought as to whether it would take the heat of a rocket stove?
Jan 4, 2019 16:30:40 GMT -8
yaya: you dont need the blowair for that temp..
Jan 13, 2019 16:43:57 GMT -8
flybywire: Glass window from an old washing machine is designed to take high temps. Cheap solution to your need.
Jan 27, 2019 0:10:58 GMT -8
coastalrocketeer: Anyone posting in this shout box... if you have something you want people to see and respond to, create a thread in the appropriate forum section... this is not the place to have a discussion... it is for short announcements
Feb 7, 2019 0:11:23 GMT -8
coastalrocketeer: you won’t likely get replies to questions here, and it is not a spot that makes holding an ongoing discussion possible...
Feb 7, 2019 0:12:22 GMT -8
TexasGonzo: Sooooo glad I found this site! Its always rewarding to find such a super group of folks! To any and all, feel free to PM me anytime. Thanks for having me!
Mar 11, 2019 18:56:41 GMT -8
jlmtech: GADGET: CONSIDER USING A JET PUMP INSTEAD OF A BLOWER FAN TO INDUCE DRAFT; NO CLOGGING.
Mar 26, 2019 8:19:28 GMT -8
michaelegan: i am unable to open the sketchup files on my mac. I used sketchup a few years back but apparently the company now requires a subscription. does anyone have any advice/instructions on how to use the program or how to view pictures without spending money?
Aug 20, 2019 18:41:48 GMT -8
mannytheseacow: michaelegan: download AutoCAD student version for free... import .SKP
Aug 23, 2019 13:33:44 GMT -8
topbaza: hi everyone, been searching all over net and this is were i need to be i think!!
Sept 28, 2019 6:16:25 GMT -8
anounaki: Hi, why I cant upload photos when I make new tread to this forum?
Feb 28, 2020 2:09:40 GMT -8
ahansen: photos under 1 mb not possible?
Jun 4, 2020 0:09:21 GMT -8