As you can see in the video, I've tested the DSR with a Bell and Chimney. The results were mixed.
The GOOD: No detectable smoke from the chimney 100oF temps exiting from the chimney Good, but not great, rocket draw
The BAD: I only got 300oF at the Bell Top Less than stellar rocket draw more than likely caused by leaks. Many leaks - around top shoebox door, around Bell Top, around one wall. (it was difficult to seal the final wall because I had to put the cob onto the wall before I attached it. The cob did not stick very well to the metal studs)
To fix the leaks in the Bell, I'll need to take the Bell Top off and One wall.
I'm leaning towards abandoning the test bell and moving forward with the permanent bell construction. There are several differences between them that I'm not sure if it's worth all the effort. The main differences are the materials used and the overall height of the unit. The ISA of the 2 versions is very close to the same. Also, the same DSR unit will be used for both. In short, I'm thinking I wasted some effort with the test Bell. However, I am much more comfortable with the overall safety of the concept.
This is what I think is going on. The gasses are hitting 760 degrees going up in the bell. The leaks in the top of the bell are bringing in cooling gases while allowing some of the heat to escape. This is preventing a full flow of the gasses down and into the chimney and therefore preventing the full draw of the chimney .
All of this together is preventing the full rocket effect from taking place.
The temperature at the top of the Bell only got to about 360 to 370 degrees Fahrenheit. The temperature at the top of the chimney was right around 110 degrees Fahrenheit.
There was no detectable smell of smoke at the chimney.
I believe the DSR rocket engine is performing well. I also believe that the Bell's structure is fundamentally flawed and therefore will be discarded.
I am one failure closer to catching up with Thomas Edison.
I'm going to now move on to the permanent install inside my house.
Do you think aluminium tape could be effectively used to improve the outside seams on you temporary bell?
I did use aluminum tape on the inside of the bell. Those areas seemed to be sealed properly. The challenge was how to seal the last wall and roof from the outside. Those 2 sections were added last. The metal studs that I used prevented access to the areas needing to be sealed. The cob I used did not stick to the metal studs.
I think will considerable time and effort I can fix the leaks.
I could be wrong, but I think the 2 things I am verifying in this test are the size of the Bell and the height of the Roof above the DSR.
I am confident that the Bell CSA and ISA meet the specifications from Peter. I have repeatedly checked the numbers.
That leaves the Bell Roof height above the riser as the remaining open issue. On this issue, there is some ability to adjust this up and down once the permanent bell has been built.
One of my favorite quotes seems to apply here, "the pursuit of perfection prevents the achievement of the satisfactory". The optimal height of the bell roof is yet to be determined for a DSR. Peter recommended that I try the height used for BBRs. My take is that it may not be the optimal height but it will probably work.
That is the HUGE question: Is there a possibility that the system will completely not work and need to be torn out? With all of the "homemade" variations of Rocket Stoves functioning out there, it does not seem to be an extremely precise concept.
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