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Post by sksshel on Jul 30, 2018 11:26:08 GMT -8
The "redneck solution" Bell and Chimney are now built. It will be used temporarily to test the flow of air through the system. Some time within the next week or so I'll fire it up. I hope to achieve a solid "Rocket" sound and temps exceeding 900 degrees F at the bell.  |
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Post by coisinger on Aug 1, 2018 8:46:05 GMT -8
Are the temporary walls there cement board or insulated panels? Just curious.
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Post by sksshel on Aug 1, 2018 8:58:41 GMT -8
Are the temporary walls there cement board or insulated panels? Just curious. Cement Boards |
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Post by sksshel on Aug 2, 2018 9:11:37 GMT -8
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Post by sksshel on Aug 2, 2018 9:39:55 GMT -8
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.
Comments?
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Post by coisinger on Aug 3, 2018 5:49:30 GMT -8
How much fuel was burned?
What type?
How long did you burn?
I could have guessed that you would have infiltration of air, but to say you'd only have 1/3 the heat that you expected (I recall 900 was your target) likely isn't due to infiltration.
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Post by Vortex on Aug 3, 2018 6:33:45 GMT -8
A real chimney would help a lot with the draw. That looks to be only a foot or 18 inches above the top of the bell? You should be able to get 1000F on top of the stove if you push it hard.
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Post by sksshel on Aug 3, 2018 8:32:57 GMT -8
How much fuel was burned? What type? How long did you burn? I could have guessed that you would have infiltration of air, but to say you'd only have 1/3 the heat that you expected (I recall 900 was your target) likely isn't due to infiltration. I'd say I burned about 1 square foot of wood. It was mostly small branches and small twigs. It probably burned for about a half hour. |
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Post by sksshel on Aug 3, 2018 11:04:15 GMT -8
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.  |
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Post by smartliketruck on Aug 5, 2018 5:50:27 GMT -8
Do you think aluminium tape could be effectively used to improve the outside seams on you temporary bell?
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Post by sksshel on Aug 5, 2018 7:25:27 GMT -8
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. |
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Post by Deleted on Aug 5, 2018 8:09:03 GMT -8
Vortex is right.
The 6' tall "temporary" chimney should have been measured from the top of the bell,
not from the exit point.
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Post by sksshel on Aug 5, 2018 9:44:28 GMT -8
Extending the chimney to 6' above bell top increased the temperatures. The temp at the Bell Roof still only got to 360 oF.  |
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Post by sksshel on Aug 5, 2018 9:45:43 GMT -8
Temporary Bell is leaking badly.  |
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Post by sksshel on Aug 5, 2018 9:50:46 GMT -8
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