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Post by peterberg on Dec 11, 2017 7:19:25 GMT -8
Are you saying that a setup as the image here is OK? Or do I need to double up the whole of the divider between fire box and tunnel? I guess it would make sense to have the 180mm height from the top of the port rather than from where it is in the image... Or would I fool it on both these points by putting the collar/ring underneath the divider, i.e. in the fire box? No, Yes, Yes. |
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Post by peterberg on Dec 11, 2017 7:23:59 GMT -8
Working on both a fibre board core and a heavy brick core drawing made me remember something that you said: All of the early experiments were done outdoors, all made of hard fire bricks and cast refractory. In hindsight, heating up did take more time, in the order of 5 to 7 minutes. After that it ran as clean as the Montana setup which was built entirely out of insulating fire bricks and ceramic glass. Does that mean that the early experiments were done without any insulation around the core? And when you say 'in the order of 5 to 7 minutes' is that the total time it was unclean or 5-7 minutes + the time for an insulated core? How long is it taking for the insulated brick core to run clean? Yes, 5-7 minutes + the time for an insulated core, at least 8 minutes. |
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ssr
New Member
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Post by ssr on Dec 12, 2017 20:37:31 GMT -8
How long will it burn one load of wood in Double Shoebox?
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Post by peterberg on Dec 13, 2017 0:48:58 GMT -8
How long will it burn one load of wood in Double Shoebox? Something between 45 minutes and an hour. Nothing definitive since experiences are few and far between. |
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Post by independentenergy on Dec 13, 2017 3:31:15 GMT -8
peter, you use stick wood as in the batch or even bigger pieces for optimal combustion.
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Post by marcoo on Dec 13, 2017 6:31:16 GMT -8
Thank you for clarifications. Are you saying that a setup as the image here is OK? Or do I need to double up the whole of the divider between fire box and tunnel?  I guess it would make sense to have the 180mm height from the top of the port rather than from where it is in the image... Or would I fool it on both these points by putting the collar/ring underneath the divider, i.e. in the fire box? This is a great pic, very helpful. Is the secondary air entering from the back or bottom, and terminating in the slot? |
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Post by esbjornaneer on Dec 14, 2017 0:36:58 GMT -8
Hello Peter, If I interpreted the last 'yes' right, how does this look? From above:  From below:  Thanks for the compliments Marcoo but as it did not show anything that was useful it isn't that good. I hope I am better with these two. We'll see... I'll remove what is no good once I have had a thumbs-up from Peter  |
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Post by peterberg on Dec 14, 2017 2:49:04 GMT -8
Yes, you would fool it, you interpreted the last "yes" the wrong way.
I highly doubt the small pieces will stay there for long. I would prefer to place a complete layer on top instead.
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Post by esbjornaneer on Dec 15, 2017 9:11:18 GMT -8
Hmm, I wonder if there is a problem with my English... what I meant with 'fool it' was 'make it believe that the port and divider is 50mm thick'.
The good thing is that with your firmness about making the divider double thickness I have managed to make a new plan for how to cut all the pieces from one board and can still do it!
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Post by esbjornaneer on Dec 19, 2017 10:19:10 GMT -8
For clarity after the failed previous attempts I am posting what I believe is what Peter is suggesting for my port   Please feel free to remove my previous attempts if you wish. |
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Post by esbjornaneer on Dec 19, 2017 11:34:31 GMT -8
Not sure if I should as the question here or in the original thread...
Peter, have you got any feeling/knowledge yet about what ISA can be run from the DSR?
Am I right that the DSR power output can be calculated in a similar fashion as Yasin did for the BBR in the 'How to size a batch rocket' thread?
And have you done, or will you be doing, any tests of how to scale it up/down in size?
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Post by peterberg on Dec 20, 2017 2:48:38 GMT -8
No.
Can't find topic, link please.
No, and not in the pipeline.
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Post by esbjornaneer on Dec 21, 2017 1:29:28 GMT -8
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Post by peterberg on Dec 21, 2017 1:54:26 GMT -8
Am I right that the DSR power output can be calculated in a similar fashion as Yasin did for the BBR in the 'How to size a batch rocket' thread? Yes, because it's based on weight of fuel. |
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Post by peterberg on Dec 21, 2017 2:55:47 GMT -8
What were the chimney temps after the two barrel bell/bench during your test runs? I didn't perform test runs with the shoebox kitchen in Allerton Abbey if that's what you mean. I've been working on that for three days including designing and it wasn't operational when I left. I did some test runs at home though, with two stacked barrels as the heat extractor but the shoebox core was made deliberately smaller to obtain an easier fit. So comparing that one directly with the larger mockup version in Montana would be a big mistake. Furthermore: I get the impression that you tend to ask two more questions for every answer that you get, which I find annoying to put it mildly. You are trying to get assurance about an experiment that's in alfa stage instead of nearing completion. In my mind, you would do better to start building something in the back garden to see how it works and work out relevant questions from that experience. There's an expression in my language that describes what it feels like what you are doing: luchtfietserij, which literally means air cycling. When and if you want to be sure about what a given heater would perform: choose a tried and proven concept and get on with it. |
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