peterberg , For DSRs, should the bell top also be 12" above the top of the heat riser? In other words, is it consistent with your recommendations for the Batch Box Rocket?
I'm currently planning on using a 16 inch riser on top of the DSR.
Having looked through the stuff on the double shoe box rocket. (Thanks for the link by the way.) I’d say that the top shoebox IS the heat riser. Only it doesn’t rise so much as burn horizontally. So the bell could be mounted straight on top of the top shoe box I think? I’ve probably got it all wrong but that’s my impression. But it doesn’t need to go up an additional riser, although I don’t imagine it would do any harm.
Yes. Doors could do with a whole section of their own. I always struggle to figure out how to do it. Especially if there is another layer of non-refractory bricks around the core. Looks like you’re ahead of the game there.
How’s the geopolymer looking? What’s the hottest you’ve heated it up to?
The exoskeleton is complete. I've added a small (5") riser on top of the top shoebox. I understand it's not necessary. I already had built all of the components so I went ahead. I've also added a "threshold". It's the piece of angle iron sitting on top of the p-channel.
I have a few questions: - I assume all of the joints need to be airtight. This is a temporary setup in my barn. I will later after testing disassemble and reassemble in my house. What is the easiest effective material to use to temporarily fill the joints for the barn testing? - cob? - rockwool? - fireplace mortar caulk? - other???
A mix of clay and sand is what I've been using for years. And the joins need to be airtight, yes. Remarks about the floor channel/threshold in the section "Experiments/results" about the DSR in general.
Last Edit: Jul 7, 2018 7:58:59 GMT -8 by peterberg
The Threshold has been added and the p-channel cut to size. The threshold has a 2" gap between it and the door. I've also cut a "redneck solution" door. The door is only temporary for testing until I can construct the permanent door. Getting closer to the first test . . . I think.
I fired up the DSR today with good results. It appeared to need more air than the recommended air inlet provided. In the pic you can see the temperature a the 5" above the shoebox top. 859oF was the top temperature achieved. Shown in the pic is the amount of extra air that I gave it to reach that temp. It was about an extra 5 square inches in addition to the 6 square inches of the original air inlet. The batch box was a little over a quarter filled.
When it reached its peak temp, there was no visible signs of smoke nor any smell of smoke.
I fired up the DSR today with good results. It appeared to need more air than the recommended air inlet provided.
Yes, that's common for such a combustion core without a riser to speak of and no chimney. Especially the chimney need to provide draw. The higher the velocity of the gases, the more air is sucked in so the inlet could be smaller.
In general, the thing could be tuned by ear. When the roar is very audible more air doesn't change much from that point.
The "Temporary" Bell is now nearly complete. It will be used for testing the air flow through the system. Once I'm satisfied that everything is working properly, I will move the DSR into my house and construct the permanent Bell.
Question: How tall should I make the "Temporary" Chimney in order to get a proper draw?
- External Layer is made from 4" x 8" x 16" Cement Blocks
- Trowel onto that a layer of thinset with "ridges" - see pic of test block below
- Trowel over the top of that layer a layer of Geo-polymer (GP)
The test block pictured below shows 3 different "ridge" depths. Once the sample dries, I will mix up some GP to trowel over the thinset. My thinking is that the thinset will provide structure and help the GP to adhere to the concrete blocks. The GP will also provide a heat shield to the concrete blocks.
From left to right is a sample of 1/2", 1/4" and 1/8" ridges.
My initial impression is that the 1/4" version will provide the proper balance between function and cost.
Here's a pic of the same cement block that is covered in thin-set is now further covered in Geopolymer (GP). The big test is which trowel notch size provides the best adhesion. I will go with the smallest notch size with good adhesion. This will provide the most efficient use of materials.
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