I'm having second thoughts about using a 5 minute riser again due to the possibility of ceramic fibers becoming airborne and then being inhaled. So I'll probably tear down all my cooking stoves with black ovens that use the 5 minute riser and just use fire brick instead.
Hmm, it could work with just some chicken wire (or several single wires) on the outside of the blanket in that case... but with a min order of 500kg it would be in the region of 100 tubes surely?
And the price range/kg being so large I wonder how expensive it would be even with a min order...
If the suggestion came due to the risk of airborne fibers I would suggest a biodegradable blanket instead. It is only rated for 1200C but It survived a test burn for a DSR2 core with a 1 meter chimney.
Hello, I have been working on a pizza oven with a 4" PBB that leads to a half barrel shaped oven. The dome is made out of Geopolymer (Thanks sksshel and Karl) and appears to be very strong. I wanted the system to be light enough to roll around on a cart but be large enough to make a reasonably large pizza as well as bake. I also wanted it to be able to heat up in a short amount of time. This is what it currently looks like:
As I read through this thread i realized that it is going to be hard to heat the floor of the oven. I was able to borrow a data logger and did some testing. I want to figure out the best arrangement before i mortar the dome on and and changes become more difficult. I know that i should have done different configurations starting from a cold oven but i only had the data logger for the weekend... These are the configurations i tried: -riser just entering the bottom of the oven. -extend the riser close to the top of the dome so it hits with more velocity and raps down the side.
-plate directing the flame at the floor.
-A mini dome to direct the heat down.
I placed a TC in the fire box, at the bottom of the riser, the top of the dome and the floor of the dome. As you can see, it is hard to heat the floor of the oven. (the gray trend). I kind of liked the mini dome condition because it seemed to warm the floor and the top of the dome didn't heat as hot (sort of like more heat was directed down instead of it all going up... ) My next firing I will try starting out with the mini dome and a fuller load of wood to start out. Does anyone have a recommendation on another way to heat the floor that i could try as well? I was trying to think of a ridge after the mini dome that worked sort of like a snow fence to pull the heat down but wasn't sure where to place it. I think getting the floor of the oven up to 200C should cook a pizza but i don't want it to take 2 hours. Also, the batch rocket is awesome! I over fueled it a couple times but it recovered quickly and the smoke went away. 1100C is impressive and i don't know if my K-type TCs are accurate at a much higher temp!
Thanks for the feedback Karl. I just realized that the temperature plot didn't post. I will try again.
I was sort of thinking about a set of pizza stones ~1" above the top of the riser but I figured that they wouldn't be able to handle the thermal shock. When the bottom of the riser hits 1100C the top is ~1000C. Perhaps a geopolymer plate to take the brunt of the heat and then pizza stones further away?
Yesterday I tried a firing with just the mini dome above the heat riser for the entire run. The floor got up to 200C in 40 minutes and 277C in an hour. That is a little longer than I would prefer but it also keep it's heat for a long time after the fire died down. I'm going to try pizzas tomorrow so I guess that will be the true test...
Post by Karl playing with geopolymers on Apr 29, 2020 6:38:43 GMT -8
One can use white high purity (>99%) corundum as an addition to geopolymer or fire cement to increase heat conductivity and capacity. Specific gravity 3.95–4.10 Thermal conductivity 41.9 W / (m · K) and the thermal capacity 754 J / (kg · K)
Thanks Karl, Do you have any thoughts on using cordiorite grog as a portion of the mix instead of kaolin? I have some on hand and considered experimenting with it but didn't know if it would disrupt the chemistry.
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 email@example.com..... the photos in this post did not show up
Apr 14, 2021 8:32:00 GMT -8