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Post by coisinger on Aug 6, 2018 5:06:57 GMT -8
You can get ceramic fiber rolls through walmart. I suggest if you want to continue testing, you could make a 'gasket' for the top using this material. It's relatively inexpensive (1" x 24" x 25') and you could seal your top with cut strips and have a large portion of the roll for insulation elsewhere in your build.
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Post by sksshel on Aug 6, 2018 12:32:43 GMT -8
You can get ceramic fiber rolls through walmart. I suggest if you want to continue testing, you could make a 'gasket' for the top using this material. It's relatively inexpensive (1" x 24" x 25') and you could seal your top with cut strips and have a large portion of the roll for insulation elsewhere in your build. Thank you for the idea. Although I didn't use it exactly as you proposed, I was successful using Rockwool. |
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Post by sksshel on Aug 6, 2018 12:34:57 GMT -8
Do you think aluminium tape could be effectively used to improve the outside seams on you temporary bell? After thinking it over, I decided to go "All In" with aluminum tape. This idea along with the rockwool got me to a successful burn. Thank you. |
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Post by sksshel on Aug 6, 2018 12:36:20 GMT -8
Thanks to the many ideas on this forum, I got to a successful burn with my temporary bell.
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Post by Vortex on Aug 6, 2018 14:58:45 GMT -8
Glad you got it working OK in the end.
Think of the chimney on a bell like a pipe siphoning beer from a barrel - except the other way up.
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Post by coisinger on Aug 7, 2018 7:11:42 GMT -8
Ceramic Fiber/Rockwool...similar idea!
Glad you got it to work out.
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Post by sksshel on Aug 8, 2018 9:04:25 GMT -8
I ran one last test to document the temperature progression through the initial stages of a burn. This demonstrates the insulative properties of the Geopolymer Settings. This was a small burn with half of the Batch Box filled with wood. The runtime is in minutes from the start of the burn. The Bell continues to have minor leaks that suppress some of these temperatures. Here are the items that I conclude from these tests: - The geopolymer settings have performed up to expectations - The DSR has also - The Bell appears to be sized appropriately - Great care needs to be taken to completely seal the DSR and Bell from leaks It does not prove nor disprove the long-term durability of the Geopolymer. @karl is a good resource for this information. Within the next few weeks, I will disassemble the DSR and Bell. At that time I will document any irregularities in the Geopolymer. Note 1: The Batch Box and Shoebox walls are both made of Geopolymer settings. Note 2: The Smoke/Vapor column and the cell content does not match. The heading should be "Smoke from Chimney yes/no"  |
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Post by sksshel on Aug 29, 2018 8:22:26 GMT -8
Here's a pic of the 1st layer of the permanent Bell. It is nearly complete. I need to fill the remaining blocks with Cob to finish it. The frame of the DSR is shown to show where it will fit. However, it will be located on top of the 4th layer.  |
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Post by sksshel on Oct 27, 2018 12:31:29 GMT -8
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Post by sksshel on Nov 4, 2018 13:11:40 GMT -8
The Bell is complete. Next steps include installing the Bell Roof, Fire Wall behind, and hooking up the Chimney.  |
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Post by sksshel on Nov 8, 2018 14:03:57 GMT -8
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Post by sksshel on Nov 11, 2018 4:07:39 GMT -8
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. This quote is from a while back. This seems to suggest that I could put a screen door on the front and not impact the performance. I'm thinking about having a screen that can be used once the fire is going. It's mainly for our "viewing pleasure". One other question: You mentioned something in another post about DSRs not being reliable. Can you elaborate? |
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Post by peterberg on Nov 11, 2018 8:14:06 GMT -8
.... seems to suggest that I could put a screen door on the front and not impact the performance. I'm thinking about having a screen that can be used once the fire is going. It's mainly for our "viewing pleasure". Hmmm... For starting up and coming up to working temperature, yes. Once the top box is hot, chimney temp will rise and more air is sucked into the system. In order to prevent killing off efficiency by lots of excess air the door should be closed by then. In normal use, my heater is operated like that. The door open a crack and when chimney temp is rising the door is closed. Air inlet isn't an opening as such, it's a combination of opening and air velocity. The higher the velocity, the smaller the air inlet opening can be. One other question: You mentioned something in another post about DSRs not be reliable. Can you elaborate? Oh dear, I wrote about the reasons quite a number of times already. But here we go again: the outside setup worked, that's for sure. With a piece of chimney pipe on top it was able to run quite well, also according to the Testo. I also built a small test bed (5") for using it in conjunction with the same two-barrels-bell I am using for what is now being called the DSR2. The problem with that particular DSR setup was that while the top box and the chimney heated up the burn got so violent that all the fuel was raced through in about 15 minutes. Up to the point that the whole setup started shaking and rattling, I would call that "going in thermal overdrive". With an accompanying high CO level and smoke out of the chimney. It showed this behaviour about 50% of the time or more so I shelved the design. That's also the reason why it isn't mentioned on the batchrocket.eu site. Current testing is underway with the same barrels-bell and chimney, while the so-called DSR2 is behaving admirably. It could be that you won't experience this phenomenon, and if so, it could be due to chmney or a more favourable heat extraction side of things. |
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Post by sksshel on Nov 12, 2018 9:22:53 GMT -8
In my limited use so far (only a few days), I have not seen the issue of "thermal overdrive". I will watch for it and post if observed.
Currently, a full load will burn in about 45 minutes.
I have a question about measuring the "Rockety" level of the burn. Is there a way to measure this? I thought about decibel levels of the fire. They peak at 60 to 70db. After the burn has peaked, they drop quickly to 40db while the embers burn. Is there another way to measure this?
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Post by Vortex on Nov 12, 2018 9:42:33 GMT -8
You're unlikely to get thermal overdrive on it now you have it hooked up to that bell/mass, also looks like you're burning log wood which is less prone to it. If it does become an issue you can try experimenting with a smaller exit hole where the gases leave the top chamber.
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