That looks great Martyn , i love that glass firebox top/front.Does the riser just sit on the burn tunnel or is it held in place with some fixing ? Do you seal the top or does it just sit on the fiberglass rope ? I imagine that being screwed down it's pretty airtight. Same question about the cooktop - just a piece of ceramic glass over the hole ?
Hi Fuegos, yes really simple design but works really well for my use, like a burning dustbin without the smoke as it will burn virtually anything that will fit in under the lid. The riser simply sits on top of the ceramic burn tunnel, the coiled up ceramic mat protrudes enough to make a good seal. The glass front and lid are simply made from vermiculite, ceramic glass and titanium exhaust wrap held together with silicone and aluminium tape. Even the hinge for the lid is just a piece of exhaust wrap siliconed in place. The steel top is screwed down and the hole has a bit of glass to cover it but I can remove the glass and put my wok directly over the heat riser for cooking. Also I have a small mirror fixed to the chimney that reflects down the riser so you can see the vortex... just for fun! There is a secondary air inlet between the glass top and the barrel. The fire box is a little bigger than standard at 10” x 7” x 12 “ high. I can make a more detailed video if you are interested.
My previous design used a more complex tunnel and shaped vortex but this one is really simple with just a piece of ceramic fibre blocking off one half of the burn tunnel.. I tried it with a double vortex as well and no vortex at all, all versions seem to work but i settled on the single vortex as it seems to start very easily. I have used a piece of glass along the top of the tunnel to carry the secondry air, it might not last or perhaps the fresh air will keep it cool enough to last?
I can make a more detailed video if you are interested.
A rough sketch with sizes would be great , but yeah a video would help a lot.I'm thinking about building some sort of J for outdoor cooking , no barrel or mass , just a hotplate on top of the riser .The vortex bit of this build is interesting to me , not sure about CFB , not that i have any doubts , just that i have firebricks and clay at hand.The door looks really neat , the airwash idea looks like it could be adapted for other batch box designs ?
The air wash works perfectly so far, the vortex is fun to show folk but i cant say if it has any benefits over a standard J tube. I can tell you that a bigger fire box and a lid will extend the burn time, the overall design is easy to operate and very quick to heat up. The temperatures on the barrel are impressive, the hot plate average temperature seems to run around 400c in the centre and 220 around the edges. I can push the temps way over that though with 580-590c frequently seen!
I can easily access the fire box as the front glass is a drop in unit, so I have tried many configurations like the vortex restriction or a double vortex just by sliding in a piece of ceramic fibreboard. However I have only just played a little bit as its current format is way past my expectations and requirements. Possibly the most different aspect is the piece of glass in the roof of the burn tunnel, it is a continuation on the P channel that runs 100mm down the fire box and has a 5mm gap. I dont know if this is working to my benefit or not but it seems to work!
"I can easily access the fire box as the front glass is a drop in unit " something that is useful for cleanout i guess ? we're 100% offgrid here & don't have a vacuum cleaner so any build has to cleanable by hand .I guess your design could be just as easy copied in steel plate for the top/front as i'm guessing it won't get hot enough there to cause spalling .
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
belgiangulch: Photo's are possible. They must be downloaded elsewhere and the image url (adress) is copyied.
Sept 14, 2020 7:26:15 GMT -8
belgiangulch: While creating a thread click on the small picture in the banner above the reply. A box pops up, paste the image url in the box. Pay no attention to the huge list of numbers and such.When you finish and hit reply your post with pictures will come up.
Sept 14, 2020 7:29:27 GMT -8
deadstarsstillburn: Hi there. I was directed this way by folks on the Permies.com website and am hoping I can get some information on how a total newbie can get started designing, siting, building, and not-dying-in-a-horrible-house-fire with a new RMH in a 160-year old home
Oct 21, 2020 6:52:10 GMT -8
deadstarsstillburn: The people over there recommended either a 6" batchbox or an 8" J-tube. I don't know what those are but am going to try to figure that out. What I need is a blueprint that I can scale to fit the need for my house. I have something likne 5000 square feet
Oct 21, 2020 6:53:00 GMT -8
deadstarsstillburn: but I do not need to heat all of it by any means. probably only need to heat half of that, maybe less.
Oct 21, 2020 6:53:15 GMT -8
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 firstname.lastname@example.org..... the photos in this post did not show up
Apr 14, 2021 8:32:00 GMT -8